Affiliation:
1. Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305–8571, Japan.
Abstract
The reaction of 2,2,3,3-tetrabromo-1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]-1,4-diisopropyltetrasilane with four equivalents of potassium graphite (KC
8
) in tetrahydrofuran produces 1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]-1,4-diisopropyl-2-tetrasilyne, a stable compound with a silicon-silicon triple bond, which can be isolated as emerald green crystals stable up to 100°C in the absence of air. The Si
Si triple-bond length (and its estimated standard deviation) is 2.0622(9) angstroms, which shows half the magnitude of the bond shortening of alkynes compared with that of alkenes. Unlike alkynes, the substituents at the Si
Si group are not arranged in a linear fashion, but are trans-bent with a bond angle of 137.44(4)°.
Publisher
American Association for the Advancement of Science (AAAS)
Reference29 articles.
1. Chemistry of the Silicon-Silicon Double Bond
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3. π-Bonding and the Lone Pair Effect in Multiple Bonds between Heavier Main Group Elements
4. The Chemistry of Organic Silicon Compounds 2001 3
5. Lehrbuch der Anorganischen Chemie 1943
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