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If the carbenium ion of 1 (obtained by ionization) is less stabilized than that of 3, then at least a molar equivalent amount of a completely ionizing Lewis acid is required for the selective formation of 1 : 1 products. If the carbenium ion of 1 is better stabilized than that of 3, then the highest selectivity for the formation of the 1 : 1 products is achieved with (catalytic amounts) of the weakest Lewis acid possible. These two rules were derived from the results obtained in the reaction of diarylmethyl chlorids with 2-methyl-1-pentene.
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Mayr et al. (1987) studied this question.
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