The sequential hydrogenation of the three aryl rings in PPh3 by the catalyst system [Nb(OC6HPh4-2,3,5,6)3Cl2]/3BunLi occurs with relative rates of 39 : 28 : 1; NMR analysis of the PhPCy2 obtained from [P(C6D5)3/H2] and [P(C6H5)3/D2] shows a predominately all cis hydrogenation of both aryl rings has occurred.
M. C. Potyen and I. P. Rothwell, J. Chem. Soc., Chem. Commun., 1995, 849 DOI: 10.1039/C39950000849
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