- Alkyl dehydrogenation in a Rh(I) complex via an isolated agostic intermediate
Chaplin, A. B.; Poblador-Bahamonde, A. I.; Sparkes, H. A.; Howard, J. A. K.; Macgregor, S. A.; Weller, A. S.
Chem. Commun. 2009, 244-246
A well-characterised 14-electron rhodium phosphine complex, [Rh(PiPr3)3][BArF4], which contains a β-CH agostic interaction, is observed to undergo spontaneous dehydrogenation to afford [Rh(PiPr3)2(PiPr2(C3H5))][BArF4]; calculations on a model system show that while C–H activation is equally accessible from the β-CH agostic species or an alternative γ-CH agostic isomer, subsequent β-H-transfer can only be achieved along pathways originating from the β-CH agostic form.
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