A study, made by g.l.c.–mass spectrometry with appropriate deuterium labelling, of the Caglioti reaction applied to the toluene-p-sulphonohydrazide (6), has provided evidence supporting the mechanism, previously proposed, of the conversion of the 1,5-diphenylpentadienide anion, as (4), into 1,5-diphenylcyclopent-1-ene as (10).
C. W. Shoppee and R. J. Hart, J. Chem. Soc., Perkin Trans. 1, 1983, 2369 DOI: 10.1039/P19830002369
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