THE DIRECT SYNTHESIS OF ORGANIC DERIVATIVES OF SILICON USING NON-HALOGENATED ORGANIC COMPOUNDS (I). THE VIBRATIONAL SPECTRA OF SOME TRIALKOXYSILANES (II). THE PROTON NUCLEAR MAGNETIC RESONANCE SPECTRA OF SOME TRIALKOXYSILANES (III).
HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
The report is comprised of three parts. In Part I some trialkoxysilanes, RO3SiH R me, et, n-pr, i-bu, and tetraalkoxysilanes were prepared directly by the reactions of the appropriate primary alcohol with a silicon-copper contact mixture. Similar attempts with secondary and tertiary alcohols, ethers, and secondary amines gave no silicon-containing products. In Part II the vibrational spectra of eight alkoxysilanes, RO3SiH R me, et, n-pr, i-pr, n-bu, i-bu, s-bu, t-bu, have been recorded, alloqing assignments of the various modes to be made. Trends observed in these spectra are discussed and compared with those found in related compounds. In Part III the H nuclear magnetic resonance spectra of some trialkoxysilanes RO3SiH R me, et, n-pr, i-pr, n-bu, i-bu, s-bu, t-bu were examined, and chemical shifts and 29-silicon-proton spin-spin coupling constants were measured. The systematic trends found in these data for the silane proton in these and related compounds are thought to reflect changes in hybridisation of the silicon-hydrogen bond. A correlation is attempted between these data and the frequency of the silicon-hydrogen stretching vibration in the vibrational spectra. Author