Abstract
Abstract
The reaction of 4,5-dichlorocyclopent-4-en-1,3-dione with 1,3,5-trimethoxybenzene under Friedel–Crafts reaction conditions gave, along with the expected 5-(2,4,6-trimethoxyphenyl)-4-chlorocyclopent-4-ene-1,3-dione, a disubstituted product―3,4-bis-(2,4,6-trimethoxyphenyl)-2-chlorocyclopent-2-en-1-one.