The carbene (1) reacts intramolecularly in a way strongly suggestive of preliminary interaction with the double bond; and, although cyclopropane formation is prevented by geometric factors, the “foiled methylene” determines the ultimate products.
M. H. Fisch and H. D. Pierce, J. Chem. Soc. D, 1970, 503 DOI: 10.1039/C29700000503
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