## Abstract By using digital deconvolution to improve spectral resolution, earlier NMR studies on ^15^Nβenriched acetamide have been revised and extended to determine the signs of the heteronuclear spinβspin coupling constants. ^1^__J__(^13^CO^15^N), ^2^__J__(^13^CH~3~^15^N) and ^3^__J__(C^1^H~3~^1
Theoretical study of the sign of the 1J(15N15N) indirect nuclear spin-spin coupling constant
β Scribed by V. Galasso
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 228 KB
- Volume
- 145
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Non-empirical calculations using the equations-of-motion approach are reported for iJ( 15Nt5N) in hydrazine, diazene, isodiazene, the azide anion, and nitrogen. Irrespective of the single or multiple nature of the bond between the nitrogens, iJ( isNi5N) should be negative in all compounds. The only exception is found in the transoid arrangements of hydrazine.
π SIMILAR VOLUMES
The sign 'J(NN) of 2-chlor0-6-methyl-['~N,]pyrimidine has been determined by 'H-('H (selective), "N (selective)} and 13C-(1H (noise), I5N (selective)} triple resonance techniques. The sign was proved to be negative (-1.6 Hz); consequently, chlorine substitution at C-2 was found to make ' . I ( " ) m
Ab initio calculations using the equations of motion approach are reported for 'J( 13C"C) of the bridgehead bond in [ 1.1.1 I-, 12.1.1 I-, [2.2.1 I-, [2.2.2]-, [3.2.1 ]-propellane, bicyclobutane, bicyclopentane, bicyclohexane and tetracyclopentane. The results give an overall picture of the influenc
The finite perturbation method is apptied to the calculation of the anisotropy of the indirect nuclear spin-spin coupling constants. For CXQF, all the elements of the tialculated coupling tensors become larger than those reported in Paper I of this series. However. for the C-H coupling anisotropy. t