反应详情

33 g of [1-(3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-7-yl)ethyl]triphenylphosphonium bromide and 6.5 g of benzaldehyde were heated under reflux in 300 ml of butylene oxide for 16 hours. After working-up in analogy to Example 49 and recrystallization from hexane, there were obtained 7.9 g of 3,4-dihydro-4,4-dimethyl-7-(α-methylstyryl)-2H-1-benzothiopyran, melting point 67°-69° C.

1. customAfter working-up in analogy to Example 49 and recrystallization from hexane