The catalytic dehydrocoupling reactions of Me2NH.BH3 and Ph2PH.BH3 using the rhodium precatalyst [Rh(1,5-cod)(mu-Cl)]2 were found to proceed by different mechanisms: heterogeneous involving Rh(0) metal for the former case and homogeneous for the latter.
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Jaska et al. (2004) studied this question.
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