The rearrangement reactions of acetylenic ammonium ylides are not inhibited by the steric requirements of the bicyclic systems of (7a) and (10a); accordingly a non-concerted mechanism analogous to (1)→(2)→(3) is proposed for these reactions, rather than the [2,3] concerted sigmatropic mechanism.
W. D. Ollis, I. O. Sutherland and Y. Thebtaranonth, J. Chem. Soc., Chem. Commun., 1973, 657 DOI: 10.1039/C39730000657
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