Rh(tmp) underwent Ph 3 P-enhanced aliphatic carbon−carbon bond activation with various nitroxides. (Ph 3 P)Rh(tmp), rapidly formed from Rh(tmp) and Ph 3 P, enhanced the rate, selectivity, and yield in comparison to Rh(tmp). From kinetic studies, the rate of reaction showed a first-order dependence on both Rh(tmp) and TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl) and saturation kinetics on Ph 3 P. The rate enhancement of (Ph 3 P)Rh(tmp) over Rh(tmp) was estimated to be about 11 at 70 °C.
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Chan et al. (2010) studied this question.
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