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Tris(trimethylsilyl)methyl and Tris(dimethylphenylsilyl)methyl Derivatives of Boron. Crystal Structures of Dihydroxyborane and of the Lithium-Boron Complex

DOI: 10.1039/DT9890000447

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 447 - 452 (1989)

Update date:2022-09-26

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Authors:

Al-Juaid, Salih S.Al-Juaid, Salih S.

Eaborn, ColinEaborn, Colin

El-Kheli, Mohamed N. A.El-Kheli, Mohamed N. A.

Hitchcock, Peter R.Hitchcock, Peter R.

Lickiss, Paul D.Lickiss, Paul D.

et al.et al.

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Article abstract of DOI:10.1039/DT9890000447

Tris(trimethylsilyl)methyl-lithium, LiC(SiMe3)3, reacts with trimethoxyborane to give the compound (Me3Si)3CB(OMe)2 (7) and the lithium-boron complex LiB(OMe)4 (8).The latter is converted on crystallisation from methanol into the solvate <(MeOH)2Li(μ-OMe)2 B(OMe)2> (11), which has been characterised by X-ray diffraction.The hydrolysis of (7) gives the dihydroxyborane (Me3Si)3CB(OH)2 (2), which may be converted into the dichloride (Me3Si)3CBCl2 (12), the difluoride (Me3Si)3CBF2 (14), the fluoride hydroxide (Me3Si)3CB(F)OH (15), the boranes(Me3Si)3CBR2 , and the hydride <(thf)3Li(μ-H)3BC(SiMe3)3> (3) (thf=tetrahydrofuran).An X-ray study shows that crystals of (2) consist of hydrogen-bonded dimers.Tris(dimethylphenylsilyl)methyl-lithium, LiC(SiMe2Ph)3, reacts with boron trifluoride-diethyl ether to give (PhMe2Si)3CBF2 (5), which may be hydrolysed to the dihydroxyborane (PhMe2Si)3CB(OH)2 (6).

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