Journal of Organometallic Chemistry p. 33 - 56 (1990)
Update date:2022-09-26
Topics:
Auner, N.
Gleixner, R.
The E/Z-isomers of 2,4-dineopentyl-1,3-disilacyclobutanes (R1R2SiCHCH2tBu)2 are obtained in good yields from the reaction of diorganovinylchlorosilanes R1R2Si(Cl)CH=CH2 with LitBu in non-polar solvents.This synthetic route becomes less attractive as the number of chlorosubstituents at the vinylsilane increases: Thus, tetrachloro-2,4-dineopentyl-1,3-disilacyclobutane (2) cannot be prepared from Cl3SiCH=CH2 (1) and LitBu in a preparative scale.Addition of a twice-molar amount of NEt3 to the mixture of 1/LitBu results in the formation of this basic disilacyclobutane as the sole reaction product in nearly quantitative yield.Evidently the bis-donor stabilized neopentylsilene (Et3N)2<*>Cl2Si=CHCH2tBu (δ), whose reactivity is comparable for this clean reaction.These experimental findings are in good agreement with the cycloaddition behaviour of δ.Careful refunctionalization of the tetrakis
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