Add time:08/09/2019         Source:sciencedirect.com

Gaseous BROMOMETHYLDIMETHYLCHLOROSILANE (cas 16532-02-8) and 2-bromo-1-chloro-2-methylpropane have been studied by electron diffraction at room temperature. Both molecules exist as mixtures of gauche and anti forms. For bromomethyldimethylchlorosilane, the mole fraction values are 0.55(9) gauche, and 0.45(9) anti. The important geometrical parameter values are (rg and ∢α):r(CH)  1.091(14) Å, r(SiC)av  1.857(3) Å, r(CBr)  1.995(17) Å, r(SiCl)  2.065(4) Å, ∢HSiC  113.3°(3.5), ∢CSiC  114.2°(5.1), τg(torsional angle for the gauche form, O° corresponds to the syn form with eclipsing SiCl and CBr bonds)  58°(15) and τa  157°(9). For 2-bromo-1-chloro-2-methyl propane, the mole fraction values are 0.35(7) gauche, and 0.65(7) anti. The important geometrical parameter values are (rg and ∢α): r(CH)  1.088(7) Å, r(CC) av  1.532(3) Å, r(CCl)  1.798(5), Å, r(CBr)  1.989(8) Å, ∢CCBr = 106.4°(0.4), ∢ClCC  115.5°(1.4), ∢CCC  113°(2), τg  54°(4) and τa  159°(3).

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