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Insertion of an Overcrowded Silylene into Hydro- and Haloboranes:  A Novel Synthesis of Silylborane Derivatives and Their Properties

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Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
Cite this: Organometallics 2004, 23, 20, 4723–4734
Publication Date (Web):August 27, 2004
https://doi.org/10.1021/om049558w
Copyright © 2004 American Chemical Society
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Abstract

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Reactions of stable silylene-isocyanide complexes Tbt(Mes)SiCNAr (3a, Ar = Mes*; 3b, Ar = Tbt; 3c, Ar = Tip; Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Mes = mesityl, Mes* = 2,4,6-tri-tert-butylphenyl, Tip = 2,4,6-triisopropylphenyl) with boron compounds were investigated. Reactions of 3a,b with BH3·THF afforded the first stable silylborane-isocyanide complexes, Tbt(Mes)SiHBH2·CNAr (4a,b). Silylene complex 3a reacted with BH3·PPh3 as well to give the corresponding silylborane-phosphine complex Tbt(Mes)SiHBH2·PPh3 (12). In addition, silylene 2 thermally generated from the corresponding disilene, Tbt(Mes)SiSi(Mes)Tbt (1), gave 12 when reacted with BH3·PPh3. These results strongly suggested that the reactions of 3 with BH3·THF and BH3·PPh3 proceeded via insertion of a silylene, Tbt(Mes)Si:  (2), into the B−H bond rather than the nucleophilic attack of the silicon atom of 3 toward the boron atom. Thermal dissociation of 4 and 12 into a base-free silylborane, Tbt(Mes)SiHBH2 (9), was evidenced by the base-exchange reactions. Furthermore, silylene 2 was found to insert into boron−halogen bonds as well as boron−hydrogen bonds. The novel reactivity of silylene 2 was applied to the syntheses of a variety of silylborane derivatives such as base-free silylboranes, silylborane-isocyanide complexes, and silylborates.

*

 Corresponding author. E-mail:  [email protected]

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Tables of atomic coordinates, bond distances, angles, and anisotropic displacement parameters for Tbt(Mes)SiHBH2·CNMes* (4a), Tbt(Mes)SiHBH2·PPh3 (12), and Tbt(Mes)Si(Cl)B(pin) (20); X-ray data in CIF format are also available. This material is available free of charge via the Internet at http://pubs.acs.org.

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