反应详情

The 3-(p-chlorobenzoyl)-levulinic acid ethyl ester used in Example 20 as the starting material was obtained in the following manner: p-chloro-acetophenone, acetic acid ethyl ester and sodium hydride were condensed to form p-chloro-benzoylacetone by the method described by Swamer and Hauser, J. Am. Chem. So. 72, 1352 (1952). The p-chlorobenzoylacetone thus obtained was alkylated by reaction with bromoacetic acid ester and sodium hydride in dimethyl formamide to produce 3-(p-chlorobenzoyl)-levulinic acid ethyl ester in a yield of 83%, having a boiling point Kp0.001 of 140°-150° C.

1. customwas obtained in the following manner
2. customcondensed