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Published February 1973 | public
Journal Article

Nuclear Magnetic Resonance Spectroscopy. Spin-Spin Coupling of Carbon to Phosphorus, Mercury, Nitrogen, and Other Elements

Abstract

Spin-spin coupling between carbon and phosphorus, mercury, nitrogen, and boron has been observed in proton-decoupled ^(13)C spectra. One-bond couplings involving carbon are generally positive and two-bond couplings are negative; however, if unhybridized p orbitals are used in the bonding, such as with phosphorus(III) or fluorine, one-bond couplings are negative and two-bond couplings are positive. A comparison of the magnitudes of carbon-phosphorus and carbon-nitrogen couplings with carbon-carbon couplings shows a significant negative contribution to the coupling constants which suggests that average energy approximation should not be used for this kind of comparison. Carbon-mercury couplings correlate well with carbon-carbon or proton-mercury couplings in similar bonding situations.

Additional Information

© 1972 American Chemical Society. Received June 8, 1972. Supported in part by the National Science Foundation and by the Public Health Service, Grant No. GM-11072 from the Division of General Medical Sciences. Preliminary communication: F. J. Weigert and J. D. Roberts, J. Amer. Chem. SOC., 91, 4940 (1969). National Science Foundation predoctoral fellow, 1965-1968.

Additional details

Created:
August 19, 2023
Modified:
October 24, 2023