Accession Number : AD0694293

Title :   BARRIERS TO ROTATION IN ortho-ALKYLPHENYL SUBSTITUTED 1,3-BENZOXAZINES,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY

Personal Author(s) : Brownstein,S. ; Horswill,E. C. ; Ingold,K. U.

Report Date : 25 APR 1969

Pagination or Media Count : 5

Abstract : Four 3,4-dihydro-3-ortho-alkylphenyl-2H-1,3-benzoxazines have been synthesized. Enthalpies and entropies of activation for rotation about the phenyl-nitrogen bond have been calculated from the temperature dependence of the proton resonance spectra for the o-isopropyl and o-t-butyl derivatives. The barrier to rotation for the o-methyl and 2,6-dimethyl derivatives was too low to be measured by this procedure. (Author)

Descriptors :   (*NITROGEN HETEROCYCLIC COMPOUNDS, *NUCLEAR MAGNETIC RESONANCE), STEREOCHEMISTRY, ENTROPY, ROTATION, CHEMICAL BONDS, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE