Conformational analysis of 1,1,2,2-tetraaryl-disilanes |
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Authors: | S.G. Baxter Kurt Mislow John F. Blount |
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Affiliation: | Department of Chemistry, Princeton University, Princeton, NJ 08544, U.S.A.;Chemical Research Department, Hoffmann-La Roche, Inc., Nutley, NJ 07110, U.S.A. |
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Abstract: | A study of the static stereochemistry of 1,1,2,2-tetraphenyldisilane (1) and 1,1,2,2-tetramesityldisilane (2) by empirical force field calculations, X-ray diffraction, and 1H NMR reveals that the preference for the anti conformation, exhibited by the unclamped 1,1,2,2-tetraarylethanes, is sustained in the analogous disilanes, although in somewhat attenuated form. This anti preference stands in contrast to the gauche preference of 1,1,2,2-tetraalkyldisilanes. Examination of 3JHH coupling constants for R2HSiSiHR2; (R = phenyl, mesityl, 2,6-dimethyl-phenyl, t-butyl, cyclohexyl) suggests the existence of a Karplus relation for H-Si-Si-H systems. |
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