Transition Metal Alkyl and Alkenyl Complexes

Transition Metal Alkyl and Alkenyl Complexes 

Relatively few examples of r-bonded r -alkyl or alkenyl metal trifluorophosphine complexes of formula [MRx(PF3)y are known (see Table XVI). 

Alkyltetrakis(trifluorophosphine)cobalt complexes can be prepared from the anion [Co(PF3)4] only with strong alkylating agents because of the low nucleophilicity of the anion (method A). Thus, treatment of [Co(PF3)4] with an oxonium salt yields [Me30] [Co(PF3)4], which on heating gives the desired product. 

An alternative route utilizes the reaction between the appropriate hydrido-metal PF3 complex with diazomethane at low temperatures, followed by pyrolysis of the resulting salt (method B). 

Good yields of certain rhodium(III) perfluoroalkyl derivatives have been obtained in oxidative addition reactions of perfluoroalkyl iodides (R I) with rhodium (I) trifluorophosphine complexes (method C). 

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XVII. Transition Metal Alkyl and Alkenyl Complexes. 122... 

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