94397-47-4Relevant academic research and scientific papers
Tris(trimethylsilyl)methyl and Tris(dimethylphenylsilyl)methyl Derivatives of Boron. Crystal Structures of Dihydroxyborane and of the Lithium-Boron Complex
Al-Juaid, Salih S.,Eaborn, Colin,El-Kheli, Mohamed N. A.,Hitchcock, Peter R.,Lickiss, Paul D.,et al.
, p. 447 - 452 (2007/10/02)
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 (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 (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).
PREPARATION AND CRYSTAL STRUCTURE OF DIPHENYLBORANE
Eaborn, Colin,El-Kheli, Mohammed N. A.,Hitchcock, Peter B.,Smith, J. David
, p. 1 - 10 (2007/10/02)
The compound (Me3Si)3CBPh2 has been made by treatment of Ph2BBr with lithium in tetrahydrofuran/benzene, and its crystal structure has been determined.The coordination about the boron atom is strictly planar, but the (Me3Si)3C-B-C(Ph) angles (122.5(2) and 127.1(2) deg) are substantially larger than the C(Ph)-B-C(Ph) angle (110.4(2) deg); the planes of the phenyl rings make angles of 91 and 47 deg, respectively, with the BC3 plane.The three B-C distances (mean 1.583(4) Angstroem) are all the same within the limits of error, and similar to those in BPh3 (mean 1.577 Angstroem).The mean B-C-Si angle is 110.3(16) deg.Within the (Me3Si)3C group the C-SiMe3 bonds (mean 1.934(3) Angstroem) are significantly longer than the Si-Me bonds (mean 1.873(6) Angstroem), and the C((SiMe3)2)-Si-C(Me) angles (mean 114(2) deg) substantially larger than the C(Me)-Si-C(Me) angles (mean 105(2) deg).The Me3Si groups are twisted by 18(5) deg from the fully staggered positions, but (in contrast to the situation in (Me3Si)3CPH2 in the gas phase) the Me groups are fully staggered.
