Synthesis and Striking Reactivity of an Isolable Tetrasilyl-Substituted Trisilaallene
Abstract

The first silyl-substituted Si3-allene, namely 1,1,3,3-tetrakis(di-tert-butylmethylsilyl)trisilaallene (4), was prepared as an air- and moisture-sensitive red solid by the reaction of the dilithiosilane (tBu2MeSi)2SiLi2 with the dichlorosilylene–NHC complex :SiCl2←NHC (NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) in benzene at room temperature. Remarkably, the reaction of 4 with methanol proceeds regioselectively to form only the 3,3-dimethoxypentasilane derivative 5, in contrast to the case for a previously reported trisilaallene. In addition, 4 undergoes unprecedented thermal isomerization to tetrakis(di-tert-butylmethylsilyl)cyclotrisilene (7).
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