The syn or anti disposition of the angular methyl groups in the tricycles (13) and (16) produced by divinylketene cyclisation is controlled by the stereochemistry of the vicinal substituent.
L. Larsen and J. K. Sutherland, J. Chem. Soc., Chem. Commun., 1989, 784 DOI: 10.1039/C39890000784
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