In the addition of dichloroketen to methylene-cyclobutane, no non-classical ionic intermediates have been detected: a spiro[3,3]heptanone is obtained which can be reduced and ring-contracted, giving spiro[2,3]-hexane derivatives.
P. R. Brook and J. G. Griffiths, J. Chem. Soc. D, 1970, 1344 DOI: 10.1039/C29700001344
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