The spontaneous cyclisation of divinyl ketenes to cyclohexadienones and the interception of the intermediate ketenes with Ph3PCHCO2Me to form allenes which cyclise to methylenecyclohexadienes has been investigated.
C. A. Barron, N. Khan and J. K. Sutherland, J. Chem. Soc., Chem. Commun., 1987, 1728 DOI: 10.1039/C39870001728
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