N-Heterocyclic carbenes do it again! [Pd(SIPr)(PCy(3))] (1; SIPr=N,N'-(bis(2,6-diisopropylphenyl)imidazolidine), which is stable under H(2), was shown to be a highly active catalyst for the hydrogenation of a wide range of alkenes and alkynes. Reactions proceed under mild conditions (relatively low Pd loading, RT, low pressures of H(2)) even when sterically hindered alkenes (tri- and tetra-substituted) are used.
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Jurčı́k et al. (2009) studied this question.
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