the proposed concerted unimolecular fragmentation step explains the effects of structure, conformation, counterion, and solvent on regioselectivity without any need to resort to the hypothesis of an unsubstantiated * intermediate.
Experimental SectionSamples of compounds 1-3 and 5 were kindly provided by Prof. A. Maercker, 4 was purchased from Aldrich, and 6 and 7 were synthesized and purified as described in the literature. 39•40 Tetrahydrofuran (THF) and 1,2-dimethoxyethane (DME) were distilled from a Na-K alloy in the vacuum line directly into the sample tube.
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