反应详情

In the manner described in Example 99, 3,3-bis(3-chlorophenyl)-2-propenal (14.6 g) was reacted with (carbethoxymethylene)triphenylphosphorane (19.15 g) in ethanol (50 ml) for 30 minutes at ambient temperature. The mixture of esters obtained from the usual work up was purified by HPLC (dichloromethanehexane; 1:2) to provide 3.2 g of the less polar (Z)-5,5-bis(3-chlorophenyl)-2,4-pentadienoic acid ethyl ester as an oil, and 11.2 g of (E)-5,5-bis(3-chlorophenyl)-2,4-pentadienoic acid ethyl ester. A portion of the (E)-isomer (E)-5,5-bis(3-chlorophenyl)-2,4-pentadienoic acid ethyl ester was crystallized from 2-propanol to give the ester, mp 68°-69° C.

1. customobtained from the usual work
2. customup was purified by HPLC (dichloromethanehexane; 1:2)