反应详情

A suspension of the 6-chloro-2-naphthoic acid (41.2 g.) in a mixture of methanol (500 ml.) and concentrated sulphuric acid (50 ml.) is heated under reflux for 3 hours, stored at ambient temperature for 3 days, then warmed until a solution is obtained. Water (2 l.) and ether (1 l.) are added. The ethereal layer is separated, and is washed in turn with water, N-aqueous sodium hydroxide, and water, dried with magnesium sulphate, and evaporated to give methyl 6-chloro-2-naphthoate (38.8 g.) m.p. 97°-98° C., which may be further purified by recrystallisation from light petroleum (b.p. 40°-60° C.) to give material of m.p. 100°-101° C.

1. temperatureis heated
2. temperatureunder reflux for 3 hours
3. temperaturewarmed until a solution
4. customis obtained
5. customThe ethereal layer is separated
6. washis washed in turn with water, N-aqueous sodium hydroxide, and water
7. dry with materialdried with magnesium sulphate
8. customevaporated