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CAS No. : | 91367-05-4 | MDL No. : | MFCD00151838 |
Formula : | C9H9ClO2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | QOTGNXMPQNGYDM-UHFFFAOYSA-N |
M.W : | 184.62 | Pubchem ID : | 7015786 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-H335 | Packing Group: | |
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 |
---|---|---|
93% | With caesium carbonate In N,N-dimethyl-formamide at 20 - 23℃; | EXAMPLES Preparation 1Methyl 4-chloro-3-methylbenzoateTo a solution of 4~chloro-3-methylbenzoic acid (25 g) in DMF (550 ml) under a dry atmosphere was added portion wise 50 g of caesium carbonate and then slowly, 10,95 ml of methyl iodide. Temperature rose from 200C to 23 0C. The reaction mixture was stirred at room temperature overnight. The mixture was cooled to 10 0C and then 800 ml of an aqueous solution of NaHCO3 (2percent) and 600 ml of ethyl acetate were successively added. The aqueous layer was separated, extracted again with 400 ml of ethyl acetate. The .bul. combined organic layers were washed successively with 2x250 ml of an aqueous solution of NaHCO3 (2percent), then 2x250 ml of aqueous solution of NaCl (2percent), dried over Na2SO4 and concentrated in vacuum. The residue was purified by distillation to afford 25.31 g of a clear yellow liquid (b.p.: 78 °C/0.08 mbar). Yield: 93percentT.L.C.: Silica gel, eluents: cyclohexane-ethyl acetate 75/25 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90.1% | for 8 h; Reflux | 4-chloro-3-methyl benzoic acid 5.2 g (0.03 mol), CH3OH 40 mLand H2SO4 1 mL were refluxed for 8 h. After completion of the reaction as indicated by TLC. The solvent was evaporated under reduced pressure and the residue was dissolved in ethyl acetate 100 mL. Then the liquid was washed with saturated Na2CO3, waterand saturated NaCl successively. The organic layer was dried over anhydrous Na2SO4 and concentrated. The residue was dried to afford X13 5.1 g (90.1 percent), mp: 76-78 °C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
68.2% | Stage #1: at 0℃; for 3.5 h; Stage #2: for 0.5 h; Reflux |
17.0 mL glacial acetic acid, 16.5 mL acetic anhydride and 2.5 mL H2SO4 were cooled in ice bath. Then X13 1.84 g (0.01 mol) and Cr2O3 3 g (0.03 mol) were added in small portion. The mixture was reacted in ice bath for 3 h. The reaction solution was poured into 200.0 mL ice water and stirred vigorously for 30 min. The resulting precipitates were collected by filtration and washed with water (70.0 mL x 3) to afford gray solid which was added into 50.0 mL eggplant flask. 16.0 mL CH3OH, 16.0 mL water and 0.4 mL H2SO4 were added to and refluxed for 30 min. The residue was added into water,and the aqueous layer was extracted with ethyl acetate (3 x 100 mL). The combined ethyl acetate extracts were washed with water (80 mL) and brine (80 mL) respectively, and then dried with anhydrous Na2SO4. When the solvent was evaporated, the yield of yellow solid compound X14 was 1.35 g (68.2 percent). mp: 131-133 °C. 1H NMR (300 MHz, DMSO-d6): δ 3.90 (s, 3H, OCH3), 7.79 (d, 1H, Ar-H, J = 8.4 Hz), 8.18 (d, 1H, Ar-H, J = 8.4 Hz), 8.35 (s, 1H, Ar-H), 10.34 (s, 1H, CHO). IR (KBr): 3425, 3082, 3003, 2953, 1726, 1720, 1689, 1188, 983, 759 cm-1. MS [M+H]+: 199.1. |
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