Less is more: Significant advancements have been made in recent years in the development of the E-selective, catalytic, functional-group-tolerant semihydrogenation of alkynes to E-alkenes through transition-metal catalysis (see scheme). For this type of catalysis, the use of mononuclear metal catalysts is superior to that of multinuclear metal catalysts.
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Michaelides et al. (2012) studied this question.
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