تفاعل #1699816

معادلة التفاعل

benzyl mercaptan

potassium carbonate

5-bromo-2-chloro-3-nitrobenzoic acid methyl ester

→

pale yellow product

المردود 94.0%

2-benzylmercapto-5-bromo-3-nitrobenzoic acid methyl ester

المردود 94.0%

المذيبات

methanol water

ظروف التفاعل

المعالجة

1. 1
   workup.STIRRINGStirring
2. 2
   أخرىThe resulting precipitate is then isolated by filtration
3. 3
   غسيلwashed with a small amount of water and subsequently with 500 ml of methanol/water
4. 4
   أخرىAfter drying

الإجراء التجريبي

71.6 g (0.58 mol) of benzyl mercaptan are dissolved in 2.9 l of methanol/water (8:2), and 79.8 g (0.58 mol) of potassium carbonate are added. At 0°-5° C., 170 g (0.58 mol) of 5-bromo-2-chloro-3-nitrobenzoic acid methyl ester are added in portions over a period of 2.5 hours with stirring. Stirring is then continued for a further 2 hours and the internal temperature is then raised to 20° C. The resulting precipitate is then isolated by filtration, washed with a small amount of water and subsequently with 500 ml of methanol/water. After drying, 208 g (94%) of pale yellow product are obtained. Recrystallisation from 400 ml of methanol gives 190 g (86% of the theoretical yield) of product having a melting point of 65°-66° C.

المصدر