The reaction of dichloroketen with 6,6-diphenylfulvene afforded a crystalline cycloadduct identified as cis-7,7-dichloro-4-diphenylmethylenebicyclo[3,2,0]hept-2-en-6-one by n.m.r. and chemical degradation studies. Similarly, the adduct obtained from dichloroketen and 8,8-diphenylbenzofulvene was shown to be cis-2,2-dichloro-2,2a,7,7a-tetrahydro-7-diphenylmethylene-1H-cyclobut[a]inden-1-one by n.m.r. analysis.
R. E. Harmon, W. D. Barta, S. K. Gupta and G. Slomp, J. Chem. Soc. C, 1971, 3645 DOI: 10.1039/J39710003645
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