The regioselectivity of the cycloaddition of 1,1-dicyclopropylallene (1) with diethy methylenemalonate (2d) was markedly influenced by the solvent polarity and the presence of a Lewis-acid catalyst suggesting that a polar mechanism is operating in preferential formation of the inner adduct (3).
Z. Komiya and S. Nishida, J. Chem. Soc., Chem. Commun., 1982, 429 DOI: 10.1039/C39820000429
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