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).
F. Toda, Y. Takehira, Y. Kataoka, K. Mori, T. Sato and M. Segawa, J. Chem. Soc., Chem. Commun., 1984, 1234 DOI: 10.1039/C39840001234
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