Analysis of the n.m.r. spectra of azirines (5)–(8) together with the X-ray crystal structure of (7) reveals that a requirement for near-coplanarity of three bonds at the spiro centre results in conformational anchoring of the five-membered ring.
R. S. Atkinson, J. Fawcett, M. J. Grimshire and D. R. Russell, J. Chem. Soc., Chem. Commun., 1985, 544 DOI: 10.1039/C39850000544
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