反应详情

Fifty milliliters of ethyl acetate were added to a solution of 4.0 g of disodium 2-(p-chlorobenzoylamino)-2-(2-cyanoethyl)malonate dihydrate in water (50 ml), and the resulting solution was adjusted to pH 2.0 by adding 1N hydrochloric acid at 0°-5° C. The organic layer was separated off and dried over magnesium sulphate. The solvent was distilled off and the resulting residue was recrystallized from diethyl ether, to give 3.2 g of the desired acid (b) as a colourless powder melting at 103°-105° C. (with decomposition).

1. customThe organic layer was separated off
2. dry with materialdried over magnesium sulphate
3. distillationThe solvent was distilled off
4. customthe resulting residue was recrystallized from diethyl ether