ELECTRON COUPLING OF NUCLEAR SPINS. 7. J(FF) FOR 2- FLUOROBENZOTRIFLUORIDES
Abstract
The nmr spectra of several 2-F, 6-X-benzotrifluorides yield values for J(FF) between the 2-fluorine and the fluorines in the CF3 group of 13 to 34 cps, depending upon the 6-substituent. The magnitude of this J(FF) is proportional to the chemical shift of the CF3 group and to the size of the 6- substituent. Two related factors appear to be involved: (1) the rota tional configuration of the CF3 group with respect to the plane of the benzene ring, and (2) electrostatic deformation of the electron distribution about the fluorines in the CF3 group.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1963
- Accession Number
- AD0403806
Entities
People
- Herbert S. Gutowsky
- V. D. Mochel
Organizations
- University of Illinois Urbana–Champaign