α,α'-DIACYLSTILBENES (Z): UN NOUVEL EXEMPLE DE TAUTOMERIE CYCLE-CHAINE. DIACETALISATION EN MILIEU NEUTRE.

Article abstract of DOI:10.1016/S0040-4020(01)87353-1

Sensitized photooxygenation of various 2,5-dialkyl-3,4-diphenyl-cyclopentadienones 1 in ether led to the expected (Z)-α,α'-diacylstilbenes 3 uncontaminated by their (E)-isomers.Several of these derivatives, bearing reactive acyl groups, show a special beh