The thermal reorganization of cis- and trans-2,2,2′,2′-tetramethylbiscyclopropylidene to a mixture of 2,2,4,4-tetramethylmethylenespiropentane and 4,4-dimethylisoprophylidenespiropentane is best rationalized in terms of a non-planar trimethylenemethane intermediate.
W. R. Dolbier, K. Akiba, M. Bertrand, A. Bézaguet and M. Santelli, J. Chem. Soc. D, 1970, 717 DOI: 10.1039/C29700000717
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