The reaction of dichlorocarbene generated from lithium trichloromethide with 1,2,3-trimethylcyclopropene produces 2,3-dichloro-cis-1,3,4-trimethylcyclobut-1-ene; even at –73° the presumed intermediate 4,4-dichloro-1,2,3-trimethylbicyclo[1,1,0]butane could not be detected.
B. M. Trost and R. C. Atkins, J. Chem. Soc. D, 1971, 1254 DOI: 10.1039/C29710001254
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