تفاعل #575239

معادلة التفاعل

2-chlorobenzaldehyde

sodium hydroxide

methanethiol

methanethiol sodium salt

→

2-methylthiobenzaldehyde

المردود 106.1%

المذيبات

water

ظروف التفاعل

المعالجة

1. 1
   أخرىA four-necked flask of 200 ml capacity, equipped with a stirrer
2. 2
   درجة الحرارةthermometer and reflux condensor
3. 3
   workup.ADDITIONcharge at room temperature for about 1 hour
4. 4
   استخلاصextracted with methylene chloride
5. 5
   أخرىThe methylene chloride layer was separated
6. 6
   تركيزconcentrated
7. 7
   workup.DISTILLATIONdistilled under reduced pressure

الإجراء التجريبي

A four-necked flask of 200 ml capacity, equipped with a stirrer, thermometer and reflux condensor, was charged with 11.2 g (0.28 mol) of sodium hydroxide and 80 g of water under a nitrogen atmosphere and 13.5 g (0.28 mol) of methanethiol was bubbled through the charge at room temperature for about 1 hour to prepare an aqueous solution of methanethiol sodium salt. To this aqueous solution was added 28.1 g (0.2 mol) of 2-chlorobenzaldehyde and the reaction was conducted in the presence of 1.1 g of tetra-n-butylammonium bromide (phase transfer catalyst) at 80° C. for 4 hours. The reaction mixture was then cooled to room temperature and extracted with methylene chloride. The methylene chloride layer was separated, concentrated and distilled under reduced pressure to give 28.9 g of 2-methylthiobenzaldehyde (b.p. 116°-118° C./5 mmHg). The yield based on 2-chlorobenzaldehyde was 95%.

المصدر