反应详情

A solution of 4-(4-chlorophenyl)-3-buten-2-one (27.1 g) and diethyl oxalate (21.9 g) in dry diethyl ether (200 ml) was added dropwise over 15 minutes to a stirred suspension of sodium ethoxide (3.45 g of sodium dissolved in absolute ethanol and excess ethanol evaporated off) in dry diethyl ether (400 ml) cooled to 5°-10° C. by an ice bath. A yellow solid began to precipitate after 5 minutes.

1. temperaturecooled to 5°-10° C. by an ice bath
2. customto precipitate after 5 minutes