Aluminum switches: The addition of AlMe3 to the isoprene polymerization catalyst 1/[Ph3C][B(C6F5)4] switches the regio- and stereoselectivity from 3,4-isospecific to 1,4-cis selective (see scheme). A heterotrinuclear Y/Al complex obtained from the reaction of 1 with AlMe3 shows 1,4-cis selectivity under similar conditions in the presence of [Ph3C][B(C6F5)4]. PI=polyisoprene.
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Zhang et al. (2008) studied this question.
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