Reactions of Silyl Anions with Metal Halides

2 Reactions of Silyl Anions with Metal Halides 

An interesting variant of metal-silicon bond formation is the combination of metal halides with silyl anions. Since silyl dianions are not available, only one metal-silicon bond can be formed directly. The silylene complexes are then accessible by subsequent reaction steps [113], An example of this approach is given by the reaction of cis-bistriethylphosphaneplatinumdichloride 25 with diphenylsilylli-thium, which yields, however, only dimeric platinadisilacyclosilanes 26a-c [114]. 

The reaction of (bistrimethylsilyl)phenylsilyllithium with bis(dicyclohexylphos-phino)ethaneplatinumdichloride also does not lead to monomeric silylene complexes but only to the silylplatinum compound 27b [115]. 

Finally, the reaction of silyl anions with dichlorides of Zr and Hf, which provides the silyl complexes 28 and 29, should be mentioned [116]. 

These and similar complexes of Ti and Zrare effective catalysts for the formation of polysilanes from primary silanes [117-120]. 

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