Portal de Periódicos da CAPES

Lewis acidity of organosilicon chlorides

1977; Elsevier BV; Volume: 140; Issue: 1 Linguagem: Inglês

10.1016/s0022-328x(00)84392-2

1872-8561

DP Graddon, Bhaskar Rana,

Chemical Synthesis and Characterization

Abstract In dry acetonitrile solution organosilicon chlorides, RnSiCl4 — n (0 ≤ n ≤ 3) react with 4 — n equivalents of Lewis bases, B. The products are non-electrolytes of very high stability. Enthalpy data are reported for R = Me, Ph; B = PBu3, pyridine N-oxide, PhNMe2, NBu3, pyridine, 4-methylpyridine, 2-methylpyridine, 2,4,6-trimethylpyridine, 2,2′-bipyridine and 1,10-phenanthroline; the data show no evidence for steric effect of 2-substitution in pyridine; bipy and phen apparently behave as unidentate bases. Infra-red spectra show that py and py-NO are coordinated. The evidence suggests that the bases are coordinated to Cl rather than Si.