Bt. Donovanmerkert et al., ELECTROCHEMISTRY STUDIES OF A METALLACYCLOBUTENE COMPLEX - SYNTHESIS OF A FURAN PRODUCT BY OXIDATION OF A COBALTACYCLOBUTENE, Organometallics, 17(6), 1998, pp. 1007-1009
Two-electron oxidation of a cobaltacyclobutene, under electrochemical
or chemical oxidizing conditions, produces a furan in high yield. Reac
tion of the cobaltacyclobutene or the furan with iron(III) chloride pr
oduces a butenolide.