Studies on ketene and its derivatives. LXVII. Photoreaction of benzophenone and benzaldehyde with diketene.

Abstract

Photoreaction of diketene with benzophenone gave 5, 5-diphenyl-1, 6-dioxaspiro [3.3]-heptan-2-one (IV), 2, 5-dihydro-4-hydroxydiphenylmethylfuran-2-one (V), 2, 2, 5, 5-tetraphenyl-1, 6-dioxaspiro [3.3] heptane (VI), and 2, 2-diphenyl-4-diphenylmethyleneoxetane (VII). Similar reaction of benzaldehyde gave trans (XVI) and cis (XVII) isomer of 5-phenyl-1, 6-dioxaspiro [3.3] heptan-2-one.