A NEW PREPARATIVE METHOD FOR (E)-2,3-DIARYLBUT-2-ENEDIALS

Reaction of 1,2-diaryl-3,4-dibromocyclo-but-1-enes (4) with silver perchlorate in the presence of water gave (E)-2,3-diarylbut-2-enedials (5), which when treated with acid were converted into 2,3-diarylbut-2-en-4-olides (6).