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CAS No. : | 6610-29-3 | MDL No. : | MFCD00007617 |
Formula : | C2H7N3S | Boiling Point : | - |
Linear Structure Formula : | H2NC(S)NHNHCH3 | InChI Key : | PTVZQOAHCSKAAS-UHFFFAOYSA-N |
M.W : | 105.16 | Pubchem ID : | 2723853 |
Synonyms : |
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Signal Word: | Danger | Class: | 6.1 |
Precautionary Statements: | P264-P301+P310 | UN#: | 2811 |
Hazard Statements: | H300 | Packing Group: | Ⅱ |
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 |
---|---|---|
77% | Example 2 Preparation of 5-(2,4-dimethyl-1,3-thiazol-5-yl)-4-methyl-2,4-dihydro-3H-1,2,4-triazole-3-thione 2,4-Dimethyl-1,3-oxazole-5-carboxylic acid (commercially available) (5 g, 31.8 mmol) and 4-methyl-3-thiosemicarbazide (3.68 g, 1.10 eq) were dissolved in DMF (15 mL). Then DIPEA (10.0 mL, 1.80 eq) was added at 20 C. Under ice bath cooling, T3P 50% w/w in EtOAc (35 mL, 1.50 eq) was added dropwise, maintaining the temperature below 10 C. The resulting mixture was then stirred at 20 C. for 2 h. The mixture was diluted with water (20 mL), then NaOH 4 M was added (20.0 mL). The organic phase was discarded and the aqueous phase was heated to 70 C. (internal temperature) for 90 min. After cooling down to 50 C., HCl 37% was slowly added until pH=6.5 was reached. The suspension was cooled to 5 C. and the solid was filtered and washed with water, and it was then dried in a vacuum oven at 40 C. overnight. Yield: 5.45 g, 24.4 mmol, 77% th 1H NMR (DMSO-d6, 400 MHz, delta ppm): 14.02 (bs, 1H), 3.39 (s, 3H), 2.69 (s, 3H), 2.34 (s, 3H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
59% | With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; In ethyl acetate; N,N-dimethyl-formamide; at 20℃;Cooling with ice; | To a solution of <strong>[14190-59-1]1,3-<strong>[14190-59-1]thiazole-2-carboxylic acid</strong></strong> (1 g, 7.74 mmol) in DMF (S mL), 4-methyl-3-thiosemicarbazide (0.895 g, 8.5 14 mmol) was added. DIPEA (2.4 mL, 14 mmol) wasadded drop wise at RT, then the mixture was cooled in an ice bath before adding T3P (50percent w/win EtOAc) (6.9 mL, 11.6 mmol). The reaction was stirred at RT ON. NaOH 4 M solution wasadded (resulting pH=8). The reaction was diluted with EtOAc and the two resulting phases were separated (the upper organic layer eliminated). The pH was adjusted to 11 with NaOH 4 M and the mixture heated to 70 °C for 2.5h. The solution was then cooled to RT for 2 hrs, then 37percent HC1 was slowly added till pH 5. A precipitate formed. It was filtered under vacuum to obtain abrown solid. Mother liquor was left standing and a precipitate formed again. It was filtered under vacuum to obtain a brown solid. The two solids were combined to obtain 914 mg of title compound (p34, y=59percent). MS (m/z): 198.9 [IVII{]t |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; In ethyl acetate; N,N-dimethyl-formamide; at 20℃;Cooling with ice; | To a solution of 3-methyl-i,2-oxazole-S-carboxylic acid (337 mg, 2.65 mmol) in DMF(1.6 mL), 4-methyl-3-thiosemicarbazide (306 mg, 2.915 mmol) was added. DIPEA (0.8 14 mL,4.77 mmol) was added drop wise at RT, then the mixture was cooled in an ice bath before addingT3P (50percent w/w in EtOAc) (2.36 mL, 3.975 mmol). The reaction was stirred at RT ON. NaOH 4M solution (2.5 mL) was added (resulting pH=8). The reaction was diluited with EtOAc and thetwo resulting phases were separated (the upper organic layer eliminated). The pH was adjusted toii with NaOH 4 M and the mixture heated to 70 °C for ih. The clear rusty red solution was thencooled to RT for 2 hrs, then 37percent HC1 was slowly added till pH 5. A precipitate formed. It was filtered under vacuum to obtain 389 mg of title compound (p36, y=74percent). MS (m/z): 197.0 [MH]t |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65% | With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; In ethyl acetate; N,N-dimethyl-formamide; at 0 - 20℃; | To a stirred solution of 1 MethyI6oxo 1 .6dihydropyri dine3carboxyIic ac d (1.0 g, 6.53 mmol) in DMF (4 mL), 4-methyl-3-thiosemicarbazide (0755 g, 7.18 ) and DIPEA (2.05mL, 11.75 mmol) were subsequently added. The mixture was cooled to 0 °C then T3P (50percent wt /EA) (5.8 mL, 9.79 mmol) was added portion-wise. The ice-bath was removed and the resulting reaction mixture was stirred ON at RT. Aqueous 4 M NaOH solution was added (resulting pH8) and the two resulting phases were separated (the upper organic layer was eliminated). Additional 4 M NaOH was added up to pH 11 then the mixture was heated to 70 °C and stirred for 40 mm. The solution was cooled to RT and 37percent HC1 was slowly added until pH 4 and a precipitate wasobtained. The precipitate was filtered and dried to afford 0.94 g of title compound (p52, y=65percent). MS (m/z): 223.1 [IVIH]t |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64% | With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; In ethyl acetate; N,N-dimethyl-formamide; at 20℃;Cooling with ice; | To a solution of 4-methyl-i,3-thiazole-5-carboxylic acid (1.09 g, 7.6 mmol) in DMF (5mL), 4-methyl-3-thiosemicarbazide (0.879 g, 8.36 mmol) was added. DIPEA (2.34 mL, 13.7mmol) was added drop wise at RT, then the mixture was cooled in an ice bath before adding T3P(50percent w/w in EtOAc) (6.7 mL, 11.4 mmol). The reaction was stirred at RT ON. NaOH 4 Msolution was added (resulting pH=8). The reaction was diluted with EtOAc and the two resulting phases were separated (the upper organic layer eliminated). The pH was adjusted to ii with NaOH 4 M and the mixture heated to 70 °C for 1. 5h. The solution was then cooled to RT for 2 hrs, then 37percent HC1 was slowly added till pH 5. A precipitate formed. It was filtered undervacuum to obtain 1.033 g of title compound (p38, y64percent). MS (m/z): 212.9 [IVII{]t |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
86.7% | In methanol; at 60℃; for 24h; | (1) 10 mmol of <strong>[32974-92-8]2-acetyl-3-ethylpyrazine</strong> was dissolved in 20 ml of methanol,Stirring at 60 C for 15 min to prepare a solution;(2) taking 10 mmol of 4-methylthiosemicarbazide dissolved in 20 ml of methanol,The solution prepared in the step (1) is dropwise added to a methanol solution containing 4-methylthiosemicarbazide, and the reaction mixture is stirred under reflux at 60 C for 24 hours to obtain a pale yellow precipitate.After the reaction, the mixture was cooled to room temperature, poured into a beaker and evaporated, and the resulting precipitate was filtered.Wash 3 times with absolute ethanol,After drying, the ligand L2 is obtained;Yield: 86.7%, |
86.7% | In methanol; at 65℃; for 3h; | General procedure: The ligands L1-L4 were synthesized by reflux method. Shown in Scheme 1, 5mM of 2-Acetyl-3-ethylpyrazine and thiosemicarbazides (L1), 5mM of 2-Acetyl-3-ethylpyrazine and 4-methylthiosemicarbazide (L2), 5mM of 2-Acetyl-3-ethylpyrazine and 4-phenylthiosemicarbazide (L3), and 5mM of 2-Acetyl-3-ethylpyrazine and 3-pyrrolethiosemicarbazide (L4) were stirred in CH3OH for 3 h at 65C. The ligands were precipitated and filtered. L1-L4 were characterized by infrared spectroscopy, electrospray ionization mass spectrometry (ESI-MS), 1H NMR, and 13C NMR (Supplementary Figs S4- S31). |
60% | In methanol; at 65℃; for 4h; | (1) <strong>[32974-92-8]2-acetyl-3-ethylpyrazine</strong> (420 ul, 3 mmol) was dissolved in methanol (20 ml).After dissolution,Add 4-methyl-3-thiosemicarbazide (315 mg, 3 mmol) and mix well.The mixed solution was refluxed at 65 C for 4 h.filter,The filtrate evaporates at room temperature.There are pale yellow crystals,Filter again,Wash 2-3 times with absolute ethanol,Obtaining compound L3; |
(1) Dissolving 10 mmol of <strong>[32974-92-8]2-acetyl-3-ethylpyrazine</strong> in 20 mL of methanol,Stir at 60 C for 15 min,Then 20mL, 10mmol4-methylthiosemicarbazideMethanol solution is added dropwiseInto the above solution,After refluxing at 60 C for 12 h,After cooling to room temperature, pour into the beaker and evaporate.The pale yellow crystal obtained above was filtered and washed with methanol three times.Get ligand (L2); |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With acetic acid; In ethanol;pH 4 - 5;Reflux; | General procedure: Equimolar quantities of appropriate Isatin derivatives (1a-3c) and 4-substitued-3-Thiosemicarbazide were dissolved in warm ethanol. The pH was adjusted to 4-5 with glacial acetic acid and heated under reflux for 1-2 hr. The reaction mixture was allowed to stand at room temperature and then poured into crushed ice, the yellow products were separated by filtration, dried and purified by flash column chromatography on silica gel using appropriate solvent system. |