反应详情

To a 500 ml. flask, fitted with a condenser and containing a solution of 1.84 g. of sodium hydroxide in 150 ml. of ethanol was added 14 g. of 8-chloro-dibenzothiophene-3-acetic acid ethyl ester. After the solution was refluxed for 1 hour, the solvent was removed in vacuo (steam bath, rotary evaporator), the residue dissolved in 100 ml. of water, and the aqueous solution acidified with dilute hydrochloric acid. The 8-chloro-dibenzothiophene-3-acetic acid was removed by filtration, washed with water and dried at 60° in a vacuum oven overnight. The yield of 8-chloro-dibenzothiophene-3-acetic acid, after crystallization from i-propanol, was 8 g., mp 220°-221°.

1. customflask, fitted with a condenser
2. additioncontaining a solution of 1.84 g
3. temperatureAfter the solution was refluxed for 1 hour
4. customthe solvent was removed in vacuo (steam bath, rotary evaporator)
5. dissolutionthe residue dissolved in 100 ml
6. customThe 8-chloro-dibenzothiophene-3-acetic acid was removed by filtration
7. washwashed with water
8. customdried at 60° in a vacuum oven overnight
9. customThe yield of 8-chloro-dibenzothiophene-3-acetic acid, after crystallization from i-propanol