Air-Stable Disilacyclopropene with a Si
C Bond and Its Conversion to Disilacyclopropenylium Ion: Silicon−Carbon Hybrid 2π-Electron Systems
Abstract

An air-stable disilacyclopropene with a Si
C bond, 1,1,2-tris(tri-tert-butylsilyl)-3-(1-adamantyl)disilacyclopropene (2), was synthesized as yellow crystals by the reaction of (tBu3Si)2SiLi2 (1) with 1-adamantanecarbonyl chloride in THF. The molecular structure of 2 was established by X-ray crystallography. The disilacyclopropene 2 represents the first CSi2 hybrid heavy analogue of cyclopropene featuring a skeletal Si
C double bond of 1.745(2) Å. The reaction of 2 with triphenylmethylium tetraarylborate in toluene produced 1,2-bis(tri-tert-butylsilyl)-3-(1-adamantyl)disilacyclopropenylium ion (3+), which was isolated in the form of the tetraarylborate salt as extremely air- and moisture-sensitive yellow crystals, representing the first isolable cyclopropenylium ion derivative with a silicon−carbon hybrid system.
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