Platinum-catalyzed hydrophosphination of activated olefins yields byproducts derived from more than one alkene. Formation of byproducts is suppressed by adding tert-butyl alcohol, consistent with a mechanism in which Michael addition of a nucleophilic Pt-PR2 group to the alkene yields a zwitterionic intermediate, which can undergo further conjugate additions.
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Scriban et al. (2005) studied this question.
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