CO2 hydrosilylation catalyzed by an N-heterocyclic carbene (NHC)-stabilized stannyliumylidene†
Dechuang
Niu, 
a
Arseni
Kostenko,
a
John A.
Kelly,
a
Debotra
Sarkar,
a
Huihui
Xu
a
and
Shigeyoshi
Inoue
*a
a
Arseni
Kostenko,
a
John A.
Kelly,
a
Debotra
Sarkar,
a
Huihui
Xu
a
and
Shigeyoshi
Inoue
*a
Abstract
The di-N-heterocyclic carbene (NHCs) stabilized stannyliumylidene, [MesTerSn(IMe4)2][BArF], (MesTer = 2,6-Mes2C6H3, Mes = 2,4,6-Me3-C6H2, IMe4 = 1,3,4,5-tetramethylimidazol-2-ylidene, BArF = (3,5-(CF3)2-C6H5)4B), was isolated from the reaction of (MesTer)SnCl with two equivalents of IMe4, followed by one equivalent of Na[BArF]. This stannyliumylidene acts as a precatalyst for the homogeneous hydrosilylation of CO2. Experimental mechanistic studies and quantum chemical calculations have been conducted to elucidate the catalytically active species and the mechanism for the transformation, revealing the stannyliumylidene [MesTerSn(CO2IMe4)2][BArF], which is formed in the presence of CO2, as the catalytically active species.
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