Accession Number : AD0618837

Title :   THE RELATIVE ACCEPTOR POWER OF BORON TRIHALIDES AND BORANE TOWARD TRIMETHYLAMINE BY PROTON N.M.R. MEASUREMENTS,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) INORGANIC CHEMISTRY LAB

Personal Author(s) : Miller,J. M. ; Onyszchuk,M.

Report Date : 29 JAN 1964

Pagination or Media Count : 7

Abstract : Proton n.m.r. spectra of .imethylamine adducts of the boron trihalides and borane were measured in chloroform solution. Chemical shifts of methyl protons relative to etramethylsilane decrease in the order: BBr3 > BCl3 > BH3 > BF3, suggesting that this is the order of acceptor activity toward trimethylamine. This is supported by the existence of a linear relationship between methyl proton chemical shifts and the heats of formation, dipole moments, or infrared vibrational shifts of boron trihalide and borane adducts. Splitting of methyl proton resonances into quarters have been observed for (CH3)3N.BCl3 and (CH3)3N. BBr3 but not for (CH3)3N.BF3 and (CH3)3N.BH3. (Author)

Descriptors :   (*BORANES, COMPLEX COMPOUNDS), (*BORON COMPOUNDS, HALIDES), (*NUCLEAR MAGNETIC RESONANCE, BORON COMPOUNDS), PROTONS, HEAT OF FORMATION, DIPOLE MOMENTS, INFRARED SPECTRA, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE