A New Disilene with π-Accepting
Groups from
the Reaction of Disilyne RSiSiR (R = Si<sup><i>i</i></sup>Pr[CH(SiMe<sub>3</sub>)<sub>2</sub>]) with Isocyanides
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Abstract
The reaction of 1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]-1,4-diisopropyltetrasila-2-yne
(<b>1</b>) with <i>tert</i>-butylisocyanide or <i>tert</i>-octylisocyanide produced the corresponding disilyne–isocyanide
adducts [RSiSiR(CNR′)<sub>2</sub>] (R = Si<sup><i>i</i></sup>Pr[CH(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>, R′
= <sup><i>t</i></sup>Bu (<b>2a</b>) or CMe<sub>2</sub>CH<sub>2</sub><sup><i>t</i></sup>Bu (<b>2b</b>)),
which are stable below −30 °C and were characterized by
spectroscopic data and, in the case of <b>2a</b>, X-ray crystallography.
Upon warming to room temperature, <b>2</b> underwent thermal
decomposition to produce 1,2-dicyanodisilene R(NC)SiSi(CN)R
(<b>3</b>) and 1,2-dicyanodisilane R(NC)HSiSiH(CN)R (<b>4</b>) via C–N bond cleavage and elimination of an alkane and an
alkene. The 1,2-dicyanodisilene derivative <b>3</b> was characterized
by X-ray crystallography
