Adducts of Disilanes

Although adducts between the Lewis acid silicon and sundry Lewis bases are important as intermediates in the reactions of Si—Si bonds, very few stable adducts are known. 

Schott et al.S59) have prepared some adducts of Si2Cl with urea  

In these compounds, adduct formation seems to involve bonds between the amine hydrogen and the chlorine of the disilane. 

Kummer et al.374 found addition compounds of Si2Cl6 and Si2Cl4me2 with bipyridyl. They postulate a six-coordinated compound. 

The Lewis base-sensitive Si—Si bond usually undergoes cleavage in reaction with such bases. Indeed, with different reaction conditions, a cleavage reaction is observed and adducts with the monosilanes and the silylene are formed, respectively372  

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