The acid-catalysed ring opening of spiro-cyclopropyl ketones having a phenyl substituent at the 2-position of the cyclopropane ring occurred with cleavage of the C(1 )–C(2) bond whether or not this was the small-ring bond more overlapped with a p-orbital of the carbonyl group.
P. Bennett, J. A. Donnelly, D. C. Meaney and P. O'Boyle, J. Chem. Soc., Perkin Trans. 1, 1972, 2982 DOI: 10.1039/P19720002982
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