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CAS No. : | 7550-35-8 | MDL No. : | MFCD00011077 |
Formula : | BrLi | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | - |
M.W : | 86.85 | Pubchem ID : | - |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P280-P301+P312+P330-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H317-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With chloro-trimethyl-silane In water; N,N-dimethyl-formamide; acetonitrile | 12.A (Step A) (Step A) Synthesis of 2-.(2,2-dimethyl-7-methoxy-1,3-benzodioxol-4-yl)acetonitrile (Compound 12a) To a solution of 2,2-dimethyl-7-methoxy-1,3-benzodioxole-4-carbaldehyde (9.3 g, 45 mmol) obtained by the method mentioned in the Japanese Published Unexamined Patent Application No. 98/147585 and by a method similar thereto in acetonitrile (47 mL) was added lithiumbromide (8.9 g, 85 mmol), and then trimethylsilyl chloride (8.5 mL, 67 mmol) was added dropwise. After 15 minutes, the mixture was ice-cooled, and 1,1,3,3-tetramethyldisiloxane (13 mL, 76 mmol) was added dropwise, followed by stirring at room temperature for 2 hours. The resulting mixture was diluted with toluene and filtered through Celite. The solvent was evaporated in vacuo from the filtrate to give a pale yellow oil. To a solution of this crude 7-bromomethyl-2,2-dimethyl-4-methoxy-1,3-benzodioxole in DMF (73 mL) was added sodium cyanide (5.0 g, 102 mmol), and the mixture was stirred at room temperature for 18hours. Under ice-cooling, water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried over sodium sulfate, and the solvent was evaporated in vacuo. The residue was purified by silica gel column chromatography (eluted with hexane/ethyl acetate=5/1) to give Compound 12a (9.1 g, 92%) as an ash-colored solid. Melting Point: 58 - 59° C. 1H-NMR (CDCl3, δ, ppm) 1.71 (s, 6H), 3.60 (s, 2H), 3.88 (s, 3H), 6.50 (d, J 9 Hz, 1H), 6.76 (d, J=9 Hz, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With hydrogenchloride In chloroform methanol; 3,6,9-trioxaundecane | 8 Preparation of 4-(2-amino-6-chloropurin-9-yl)-2-fluorobutanol STR36 Example 8 Preparation of 4-(2-amino-6-chloropurin-9-yl)-2-fluorobutanol STR36 Sodium borohyride (15 mg) was dissolved in dry diethyleneglycoldiethylether (0.9 ml) and stirred. Finely powdered and dry lithiumbromide (34 mg) was added, followed after 1/2 hour by 4-(2-amino-6-chloropurin-9-yl)-2-fluorobutyric acid ethyl ester (100 mg). The reaction mixture was heated at 100° C. for 3 hours, then poured onto crushed ice (10 g) with added concentrated hydrochloric acid (0.5 ml) and stirred. The pH was adjusted to 6.5 by sodium hydrogen carbonate, the solution was evaporated in vacuo and the residue was redissolved in methanol-chloroform (40-60, 10 ml) and filtered. The solution was purified by chromatography on a silica gel column eluted with a methanol-chloroform gradient, to give the desired product (52 mg, 60%) TLC (silica gel, methanol-chloroform 40-60): Rf =0.66. UV (ethanol)λmax: 310 and 247 nm. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With {Py3Co3O(OAc)5OH}PF6 or {Py3Co3O(OAc)6}PF6 In chlorobenzene refluxing; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With 1,3-dioxolane In further solvent(s) (N2); salts mixt. (1/1 molar ratio) stirred at 25-74°C for 1-48 h in 1,3-dioxolane; heated (vac.); | |
>99 | With 1,2-dimethoxyethane In 1,2-dimethoxyethane (N2); salts mixt. (1/1 molar ratio) stirred at 25-85°C for 1-36 h in monoglyme; heated (vac.); | |
With C4H8O In tetrahydrofuran (N2); salts mixt. (1/1 molar ratio) stirred at 25-67°C for 1-48 h in THF; heated (vac.); |
6-100 | With diethyl ether In diethyl ether (N2); salts mixt. (1/1 molar ratio) stirred at 25-35°C for 1-32 h in Et2O; heated (vac.); |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withglass beads at 67°C (refluxed) for 8 h; | |
99% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withmagnetic stirrer at 67°C (refluxed) for 16 h; | |
99% | In diethyl ether byproducts: sodium bromide; under N2, soln. of LiBr in Et2O stirred with magnetic stirrer for 2 min, 1 equiv of NaBH4 introduced, maintained at 35°C with stirring for 32 h; |
98% | In diethyl ether byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in Et2O stirred with glass beads at 35°C for 12 h; | |
97% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withglass beads at 25°C for 32 h; | |
97% | In diethyl ether byproducts: sodium bromide; under N2, soln. of LiBr in Et2O stirred with magnetic stirrer for 2 min, 1 equiv of NaBH4 introduced, maintained at 25°C with stirring for 48 h, kept at 34°C with stirring for 30 min; ppt. sepd., soln. heated to distill off Et2O; | |
81% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withmagnetic stirrer at 25°C for 48 h; | |
68% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withoverhead mechanical stirrer at 67°C (refluxed) for 8 h; | |
14% | In tetrahydrofuran byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in THF stirred withoverhead mechanical stirrer at 25°C for 24 h; | |
6% | In diethyl ether byproducts: sodium bromide; under N2, soln. of LiBr in Et2O stirred with overhead mechanical stirrer for 2 min, 1 equiv of NaBH4 introduced, maintained at 35°C withstirring for 48 h; | |
In diethyl ether byproducts: sodium bromide; under N2, soln. of LiBr and NaBH4 (molar ratio 1:1) in Et2O stirred with glass beads at 25°C for 18 h and at 35°C for 0.5 h; ppt. sepd., soln. refluxed with stirring for 15 min, cooled, extd. fromppt. with ether, solns. collected; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ethylamine In further solvent(s) byproducts: (C2H5)3SiNC2H5, H2; reaction of Li with Et3SiBr in EtNH2;; | ||
With ethylamine |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ammonia In water byproducts: NH4 compounds; solving pure Li2CO3 in small excess of HBr in platinum crucible, neutralization with NH3 gas, vaporization;; melting of residue, drying with electrolyte hydrogen;; | ||
In water reaction of Li2CO3 with HBr in aq. soln.;; 50% soln. of LiBr;; | ||
In water slow vaporization of sats. soln. of Li2CO3 in HBr;; crystal crust;; |
In water solving Li2CO3 in pure HBr, filtration, heating in oil bath at 180°C in stream of H2, then in stream of HBr, cooling and crystn. in stream of dry N2;; | ||
In water solving purified Li2CO3 (transformation into nitrate, 3 fold recrystn. pptn. with (NH4)2CO3) in HBr;; 3 fold recrystn.;; | ||
In water treatment of purified Li2CO3 (solving Li2CO3 in CO2 containing water, vaporization in platinum crucible, 2 fold repeated) with HBr;; | ||
With NH3 In water byproducts: NH4 compounds; solving pure Li2CO3 in small excess of HBr in platinum crucible, neutralization with NH3 gas, vaporization;; melting of residue, drying with electrolyte hydrogen;; | ||
In water solving Li2CO3 in pure HBr, filtration, heating in oil bath at 180°C in stream of H2, then in stream of HBr, cooling and crystn. in stream of dry N2;; | ||
In water formation on neutralizing Li2CO3 with HBr-soln.;; recrystallization from water;; | ||
In water |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; methanol; dichloromethane PhN2C6H4OMe dissolved in THF, filtered, Pd(OAc)2 added, ppt. filtered off after 3 days, dissolved in CH2Cl2, MeOH soln. of LiBr added, shaken for 5 h; evapd. in vac., residue shaken with water, filtered, powder washed with water, MeOH; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
63% | With n-butyllithium In diethyl ether; hexane byproducts: butane; under N2, diamine in petroleum ether and diethyl ether cooled to 0°C, dropwise addn. of n-BuLi in hexane, warmed to room temp., stirred for 10 h, boiled for 6 h under reflux, cooled to -78°C, addn. of CH3BBr2 in petroleum ether, warmed; solvent distd. off, volatiles condensed into a trap (-196°C) at 80°C, distn.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In water crystn. from soln. of 1 mol LiBr in ca. 4 mol H2O, various conditions;; | ||
In water crystn. from soln. of 1 mol LiBr in ca. 4 mol H2O, various conditions;; | ||
at -20.16℃; for 2h; | 2.1. Synthesis and crystallization Lithium chloride dihydrate was crystallized from anaqueous solution of 39.1 wt% LiCl, stored in a cryostat at258 K. After one month, a glass splinter was added to thesupercooled solution and within 1 h crystals could beobserved. Crystals of LiCl3.H2O were picked from a solutionof 38.4 wt% LiCl and 0.61 wt% Li2SO4 cooled to 233 K for1 h. The purpose of the experiment was to prove whether atsuch a low temperature a dihydrate of the sulfate couldcrystallize. But instead, good quality crystals of LiCl.3H2Owere obtained. For the crystallization of lithium chloride pentahydrate, an aqueous solution of 28.0 wt% LiCl wasstored in a refrigerator at 199 K. Despite the addition of glasssplinters, no crystallization occurred until, after one month,some LiBr.5H2O crystals were added as nucleating agents.With this addition, crystallization was observed within 2 h. Forthe preparation of solutions, anhydrous lithium chloride (LiCl,Alfa Aesar, >98%) was used. For the crystallization of lithium bromide dihydrate, an aqueous solution of 65.0 wt% LiBr was prepared at 313 K. After 1 h at room temperature, crystalscould be observed. Lithium bromide trihydrate crystallized within 2 h from an aqueous solution of 59.0 wt% LiBr placedin a cryostat at 253 K. Lithium bromide pentahydrate crystallized from a solution of 47.0 wt% LiBr stored in a refrigerator at 199 K. Crystallization took place after one week. For the preparation of the solutions, anhydrous lithium bromide(LiBr, Fluka, >98%) was used. Lithium iodide trihydrate crystallized at room temperature from a 70 wt% solutionprepared at 353 K from anhydrous lithium iodide (LiI, Merck-Schuchard, >99%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogen bromide In water passing dry HBr through soln. of LiBr satd. at 15°C;; | ||
With HBr In water passing dry HBr through soln. of LiBr satd. at 15°C;; | ||
at 19.84 - 39.84℃; for 1h; | 2.1. Synthesis and crystallization Lithium chloride dihydrate was crystallized from anaqueous solution of 39.1 wt% LiCl, stored in a cryostat at258 K. After one month, a glass splinter was added to thesupercooled solution and within 1 h crystals could beobserved. Crystals of LiCl3.H2O were picked from a solutionof 38.4 wt% LiCl and 0.61 wt% Li2SO4 cooled to 233 K for1 h. The purpose of the experiment was to prove whether atsuch a low temperature a dihydrate of the sulfate couldcrystallize. But instead, good quality crystals of LiCl.3H2Owere obtained. For the crystallization of lithium chloride pentahydrate, an aqueous solution of 28.0 wt% LiCl wasstored in a refrigerator at 199 K. Despite the addition of glasssplinters, no crystallization occurred until, after one month,some LiBr.5H2O crystals were added as nucleating agents.With this addition, crystallization was observed within 2 h. Forthe preparation of solutions, anhydrous lithium chloride (LiCl,Alfa Aesar, >98%) was used. For the crystallization of lithium bromide dihydrate, an aqueous solution of 65.0 wt% LiBr was prepared at 313 K. After 1 h at room temperature, crystalscould be observed. Lithium bromide trihydrate crystallized within 2 h from an aqueous solution of 59.0 wt% LiBr placedin a cryostat at 253 K. Lithium bromide pentahydrate crystallized from a solution of 47.0 wt% LiBr stored in a refrigerator at 199 K. Crystallization took place after one week. For the preparation of the solutions, anhydrous lithium bromide(LiBr, Fluka, >98%) was used. Lithium iodide trihydrate crystallized at room temperature from a 70 wt% solutionprepared at 353 K from anhydrous lithium iodide (LiI, Merck-Schuchard, >99%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | With n-butyllithium In diethyl ether; hexane byproducts: butane; under N2, diamine in petroleum ether and diethyl ether cooled to 0°C, dropwise addn. of n-BuLi in hexane, warmed to room temp., stirred for 10 h, boiled for 6 h under reflux, cooled to -78°C, addn. of CH3BBr2 in petroleum ether, warmed; solvent distd. off, volatiles condensed into a trap (-196°C) at 80°C, distn.; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethanol in boiling soln. with excess PPh3; | ||
In ethanol in boiling soln. with excess PPh3; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
66% | With triphenylphosphine In ethanol under N2, LiBr in abs. EtOH, addn. of complex, mixt. stirred at room temp. for 10 min, addn. of PPh3, mixt. stirred at room temp. for 2h, briefly heated to reflux, cooled to 0°C; pptn., filtered, washed (ethanol), recrystn. from CH2Cl2 by addn. of EtOH, washed (n-pentane), elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran LiBr in THF mixed with equimolar amt. of CuBr; | ||
In tetrahydrofuran CuBr and LiBr mixed in THF for 30 min on ice in Ar; | ||
In tetrahydrofuran at 20℃; for 0.5h; Inert atmosphere; |
In tetrahydrofuran at 20℃; Schlenk technique; | ||
In diethyl ether at 20℃; for 0.75h; Inert atmosphere; | ||
In tetrahydrofuran at 20℃; for 0.25h; Inert atmosphere; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In not given treatment of Au-complex with 4-5 equiv. of LiBr, then addn. of equimolaramt. of ligand; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | With silver nitrate In acetone byproducts: AgI; stirring of Pt-complex with AgNO3, filtration off of AgI, LiBr addn.; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
71% | With lithium methanolate; hydrogen bromide In ethanol; water byproducts: CO; under N2, complex soln. stirred and cooled to 10°C, addn. of anhydrous LiBr followed by addn. of LiOCH3 (CO evoln.), color change, further stirred for 10 min after gas evoln. had stopped, dropwise addn. of 48% aq. soln. of HBr, stirred for 5 min; pptn., addn. of further HBr, stirred for 1h at room temp. for complete pptn., mixt. filtered, washed (ethanol, hexane), elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | With CH2Cl2 In methanol; dichloromethane dissolving freshly prepared monohydride and LiBr in CH2Cl2-methanol (1:1) under N2; stirring for 1 h; evapn. of CH2Cl2 in vacuum;; pptn.;; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 85% 2: 7% | In diethyl ether under N2, soln. of Os complex in Et2O treated with EtOSO2CF3 (1.27 M inEt2O) at 25°C, stirred for 60 h at 25°C; evapd., chromd. (SiO2, petroleum ether, CH2Cl2); |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethanol; toluene slow addn. of stoich. amt. of ligand (in toluene) to PdCl2 and excess LiBr (in EtOH) with stirring, then stirring for 3 h (pptn.); filtration, washing (EtOH, ether), drying (vac.); elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
84% | In benzene room temp., 1 d, filtration of supernatant soln., stirring with addnl. LiBr (room temp., 15 h); filtration, removement of solvent (reduced pressure), washing (pentane), drying (vacuum); elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | In tetrahydrofuran; dichloromethane (Ar); stirring (room temp., 3-4 h); solvent removal (vac.), extn. (benzene), freeze drying; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | In tetrahydrofuran; diethyl ether (N2); color change, pptn., stirring (10 min); removal of volatile materials (reduced pressure), extn. (pentane/diethylether), filtration, concn., hexamethyldisiloxane (vapor diffusion, room temp.); |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48% | In diethyl ether; hexane; pentane Ar atm.; molar ratio (Ph2PO)2NH:BuLi 1:1, stirring (-50°C), heating (2 h, room temp.), stirring (2 h), cooling (-20°C), stirring (1 h, room temp.); evapn. (vac.), drying (vac.), extraction (n-pentane), filtn., concn., crystn. (-50°C); |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
97% | In acetone soln. of Au carbene complex and LiBr in acetone was stirred for 16 h; solvent removed (vac.); residue dissolved (partially) in CH2Cl2; soln. passed through a short plug of silica; solvent evapd; elem. anal.; | |
85% | In acetone at 20℃; for 24h; | |
73% | In acetone byproducts: LiCl; stirring soln. of gold compd. and lithium bromide in acetone at room temp. for 24 h; evapn., addn. of CH2Cl2, drying over MgSO4, filtration over silica gel, concn., addn. of pentane, filtration, washing with cold pentane, drying,elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
34% | With KC8 In tetrahydrofuran byproducts: KSiMe(t-Bu)2, KBr; (Ar); glovebox; THF was vac. transferred to mixt. of diene and KC8; stirred at room temp. for 30 min; THF was replaced with hexane; centrifuged;evapd.; LiBr was added; THF was vac. transferred; stirred at room temp. for 1 d in sealed tube; THF replaced with hexane; centrifuged; recrystd. (pentane); | |
23% | With KC8 In tetrahydrofuran byproducts: Me(t-Bu)2SiK, KBr; Ge-Si compd. treated with KC8 (2 equiv.) in THF; treated with dry LiBr (excess) in THF; recrystd. from hexane; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
51% | With air In tetrahydrofuran; ethanol soln. of Mn compd. in EtOH was added to soln. of ligand in THF; mixt. was stirred for 1 h; LiBr (5 equiv.) was added; stirred for 1 h; kept overnight; concd. (vac.); filtered; washed (Et2O); recrystd. (EtOH/Et2O, 1/1); dried in vac. over P2O5; elem. anal.; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
99% | In tetrahydrofuran | |
99% | In tetrahydrofuran at 20℃; for 0.5h; Inert atmosphere; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
75% | In tetrahydrofuran | |
75% | In tetrahydrofuran at 20℃; for 27h; Inert atmosphere; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran at 20 - 25℃; for 0.5h; | 62.i Copper (I) cyanide (5.71 g, 63.72 mmol) and lithium bromide (11.07 g, 127.44 mmol) were dissolved in THF (40 mL) and stirred for 30 min at r.t. Then the mixture was cooled to -78° C. and (2-cyanopyridin-3-yl)zinc(II) bromide (0.33 M in THF) (193 mL, 63.72 mmol) was added. The mixture was stirred at room temperature for 40 min and then cooled to -78° C. A solution of 3-bromo-4-methoxybenzoyl chloride (15.90 g, 63.72 mmol) in THF (50 mL) was added. The reaction mixture was stirred at room temperature over night. The mixture was quenched with sat.aq. NH4Cl (15 mL) and concentrated. DCM (200 mL) and water (50 mL) was added. A precipitate was filtered off, the organic layer separated and the aqueous layer was extracted with DCM (×2). The combined organics were dried (Na2SO4), filtered and concentrated. Purification on a silica gel column eluted with 0-60% EtOAc in heptane gave 3-(3-bromo-4-methoxybenzoyl)picolinonitrile (6.03 g, 30% yield): MS (CI) m/z 317, 319 [M+1]+. | |
In tetrahydrofuran at 20℃; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In neat (no solvent, solid phase) under Ar atm.: powders mechanical milled, ground for 20 h, annealed at 550 °C for 5 h, pressed into pellets for annealing; | ||
In neat (no solvent, solid phase) at 600℃; | 2.1 Synthesis of Li6PS5X General procedure: The Li6PS5X (X=Cl, Br, I) compounds were synthesized using a solid-state sintering method [44,45]. Li2S (Alfa Aesar, 99.9%), P2S5 (Aladdin, 99%), and LiX (X=Cl, Br, I; Alfa Aesar, 99.9%) powders were typically mixed according to the stoichiometric ratio followed by hand-grinding in an agate mortar. The mixture was loaded into a glassy carbon crucible, which was vacuum-sealed in a carbon-coated quartz tube. The mixture was then slowly heated to 600°C at 0.3°C/min to avoid extensive exothermal reaction and cooled down naturally in the furnace. The resultant ingot was ground in an agate mortar for further use. Additionally, Li6PS5X with 2wt% excess Li2S was prepared with the same procedure to evaluate the effect of Li loss due to volatilization at high temperatures [46]. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1.73 g | Stage #1: dichloro bis(acetonitrile) palladium(II); triphenylphosphine In acetone at 20℃; for 18h; Inert atmosphere; Stage #2: lithium bromide In acetone for 3.5h; Inert atmosphere; Stage #3: lithium bromide In acetone for 504h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | In ethanol; water at 78℃; for 8h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
19% | In water | Synthesis of [Co(en-N,N′)2(enH-N)2]Br5·H2O Finely powdered cis-[Co(en-N,N′)2Cl2]Cl·H2O (5.0 g) was rapidly added to neat ethylenediamine (50 g) with vigorous stirring to ensure complete dissolution. After 1 min, 1.0 M HCl (833 mL) was rapidly added, with cooling and stirring (CARE: this must be carried out in a fumehood, as copious fumes are produced), followed by water (500 mL), and the resulting solution was loaded onto a column containing Dowex 50 W × 2 cation exchange resin. The column was washed with 1.0 M HCl (2.0 L) and 2.0 M HCl (2.0 L), and the products were removed on elution with 4.0 M HCl. The initial fractions consisted of orange-yellow [Co(en-N,N′)3]3+ and were discarded. The desired product was contained in an orange-red band which was subsequently eluted. The eluate was reduced to dryness (rotavap), and the solid was crystallised from the minimum volume of warm water to which was added LiBr. The product was washed with ice-cold MeOH and dried in air. Yield = 2.2 g (19%). Anal. Calc. for CoC8H36N8OBr5: C, 13.37; H, 5.05; N, 15.59; Br, 55.57. Found: C, 13.17; H, 4.97; N, 15.27; Br, 55.13. 1H NMR (D2O) δ 3.41 (4H, t), 2.86 (12 H, br m) ppm. 13C NMR (D2O) δ 45.2, 44.0, 40.6, 38.9 ppm. UV-Vis (H2O) [λmax, nm (ε, mol-1 L cm-1)]: 480 (95), 348 (85). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With 18-crown-6 ether In tetrahydrofuran at 20℃; for 48h; Inert atmosphere; Glovebox; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | In ethanol; water at 80℃; | 3.2.3 Palladacycle 3 Palladacycle 3 was prepared from 1 (500 mg, 0.420 mmol) and excess of LiBr (198 mg, 2.280 mmol) in ethanol: water (27/3, v/v) mixture following the procedure previously published for the related palladacycle [11]. Yield: 94% (405 mg, 0.393 mmol). FT-IR (KBr, cm-1): ν(NH) 3404 (br); ν(C=N) 1625 (vs). 1H NMR (CDCl3, 400 MHz): δ 2.22, 2.30, 2.34 (each s, 3×3H, CH3), 6.15 (s, 1H, NH), 6.18 (d, JHH=7.8Hz, 1H, ArH), 6.34 (s, 1H, ArH), 6.69 (d, JHH=7.8Hz, 1H, ArH), 6.90 (d, JHH=8.0Hz, 2H, ArH), 7.13 (br s, 2H, ArH), 7.17 (d, JHH=8.3Hz, 2H, ArH), 7.27 (br, 3H, ArH and NH). 13C NMR (100.5 MHz, CDCl3): δ 20.9, 21.1, 21.2 (CH3), 113.6, 113.7 124.4, 125.4, 125.6, 127.1, 127.5, 129.7, 130.1, 130.8, 132.0, 133.5, 133.9, 135.4, 135.7, 137.3, 140.1, 143.4, 147.2 (ArC/ArCH, and C=N). MS (TOF-ES+), m/z (intensity %), [ion]: 516 (97) [(C,N)PdBr+H]+; 475 (77), [(C,N)Pd+K]+; 329 (100), [LH24-tolyl]+. Anal. Calcd for C44H44N6Br2Pd2 (Mw: 1029.52): C, 51.33; H, 4.31; N, 8.16%. Found: C, 51.32; H, 4.34; N, 8.12. Greenish yellow crystals of 3·2CHCl3 suitable for X-ray diffraction were grown from chloroform/toluene mixture at ambient temperature over a period of several days. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
at 150℃; for 48h; Inert atmosphere; | Li3OBr was synthesized by the direct reaction of a stoichiometric ratio of Li(OH)·H2O (Aldrich, >98% ACS Grade) and LiBr (Aldrich, >99%). As previously done by the authors in Ref. [14], the starting materials were ground together using a mortar and pestle and dried under an Argon atmosphere at 150°C for 48h. The sample was then heated to 400°C over a 2-h period to liquefy the materials, held for 15min, and quenched onto a copper block. It was noted that samples slow cooled in the furnace tended to be difficult to remove from the alumina crucible used. The sample was ground to a fine powder using a laboratory coffee-type grinder. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With magnesium hydride at 190℃; Milling; | ||
Stage #1: lithium amide; lithium bromide In neat (no solvent) Milling; Stage #2: In neat (no solvent) at 250℃; for 12h; Inert atmosphere; Glovebox; | General procedure: Lithium amide (Sigma-Aldrich, 95%) was used without further purification. Anhydrous lithium halides (Sigma-Aldrich, P98%) were dried at 300 C under high vacuum (1*10-6 mbar) for 24 h prior to use. All manipulations were performed inan argon-atmosphere glove box. Amide halides were synthesised by grinding the appropriate halide with LiNH2 in the desired molar ratio, placing the reaction mixture into a quartz tube, and heating under an argon flow (1 bar) at the required temperature for the specified reaction time. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
75% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
78% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine In tetrahydrofuran at 70℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine In tetrahydrofuran at 70℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | In water at 20℃; for 1h; | General Procedure for Metathesis Reaction: Preparation of Ionic Liquids 3-8 General procedure: 1-Methoxy/1,6-dimethoxy pyridinium bromide (1.0 equiv./1.784x10-3 mmol) and 1.03 equiv. inorganic salt (NaBF4, K4PF6, and LiCF3SO3) are mixed with 10 mL of deionized water at room temperature with stirring for about 1 h to give anion exchanged products 3-8. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | In water at 20℃; for 1h; | General Procedure for Metathesis Reaction: Preparation of Ionic Liquids 3-8 General procedure: 1-Methoxy/1,6-dimethoxy pyridinium bromide (1.0 equiv./1.784x10-3 mmol) and 1.03 equiv. inorganic salt (NaBF4, K4PF6, and LiCF3SO3) are mixed with 10 mL of deionized water at room temperature with stirring for about 1 h to give anion exchanged products 3-8. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | In chloroform; isopropyl alcohol; at 20℃; for 2h; | To a suspension of trans-[PdCl2L2] (0.10mmol) in 5mL of iPrOH/CHCl3 (1/1) a solution of LiBr (2.4mmol) and PPh3 (0.2mmol) in 5mL of iPrOH was added under stirring at room temperature. After two hours, the solution was concentrated to half the volume and 5mL of Et2O was added. The microcrystalline solid was filtered off, washed several times with iPrOH and Et2O and dried under vacuum. Yield: 96%. Elem. anal. calcd for C36H30Br2P2Pd: C, 54.68; H, 3.82; found: C, 53.61; H 3.92. NMR: 1H 7.75-7.41 (m, 30H, Ph), 31P{1H} 23.2 (s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
at 20℃; for 72h; | Synthesis L-Proline lithium bromide monohydrate salt was synthesized by dissolving analar grade lithium bromide (LiBr - LOBA Chemie) and L-proline (C5H9NO2 - LOBA Chemie) in stoichiometric ratio in double distilled water at room temperature and continuously stirred well using magnetic stirrer. Slow evaporation of the solvent at room temperature yielded LPLBM salt in about three days. The purity of the synthesized salt was improved by successive recrystallization process. The reaction mechanism of the synthesis of LPLBM material is shown in Scheme 1. | |
at 20℃; enantioselective reaction; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
25% | at 20℃; for 2h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | With triethylamine In acetonitrile at 70℃; for 12h; Inert atmosphere; Schlenk technique; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | With air In acetone at 20℃; for 24h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | In acetone Inert atmosphere; | Formation of 2b from (1,3-bis(3′-butylimidazol-2′-ylidene)benzene)disilver(I) dichloride (2a) General procedure: The complex 2a (0.66g, 1.09mmol), LiBr (0.19g, 2.19mmol) and dry acetone were combined and stirred for 18h under inert atmosphere. The solvent was evaporated and the solid was dissolved in CH2Cl2. The solution was filtered through Celite and concentrated under reduced pressure. The complex 2b was isolated (0.75g, 0.54mmol) upon precipitation with pentane. Yield: 98% |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% | With methanesulfonyl chloride; triethylamine In tetrahydrofuran at -45 - 20℃; for 0.5h; |