Rheniumpentacarbonyl alkyls

Reaction with germyllithiutn reagents can yield CO inserted products (92) [Eq. (54)]. Thus methyl rheniumpentacarbonyl reacts with germyl-lithium compounds to give anionic acyl complexes which can be isolated as tetraethylammonium salts or alkylated to give carbene complexes. 

Alkyl rheniumpentacarbonyl species are known to be reluctant to undergo alkyl migration reactions (43)-, third row i/-block transition metals (i.e., 5d) are usually less inclined to undergo alkyl migration than the 3d... 

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