Chlorine isotope effects in base-promoted dehydrochlorinations have been measured for the first time, and the results point to an E2 to E1cB mechanistic switch in the para-substituted (p-YC6H4)2CH·CHCl2 series, as the substituent becomes more powerfully electronwithdrawing.
A. Grout, D. J. McLennan and I. H. Spackman, J. Chem. Soc., Chem. Commun., 1976, 775b DOI: 10.1039/C3976000775B
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