ISSN:
0749-1581
Keywords:
Imidazole-BH3
;
Imidazole-BF3
;
1H, 11B and 13C NMR
;
Long-range J(C,H) values
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Some N-BH3, N-BF3, N+-CH3 and N+-H imidazole derivatives have been prepared and their 13C, 11B and 1H NMR spectra studied. The effect of the different substituents was analysed. The isolobal character of the N-BH3 and N-CH3 derivatives is reflected in their spectra. In the 13C—H coupled spectra of N-borane adducts, the hydrides appear to be coupled with the heterocyclic carbon atoms. The C-4 chemical shift value is indicative of the nature of the N-substitution: lone pair (128-130 ppm), BH3 (126-128 ppm), BF3 and [CH3]+ (122-124 ppm) or [H]+ (117-119 ppm). The latter values allowed the chemical shifts of frozen imidazole to be estimated: 128 ppm for C-4 and 117 for C-5.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260310207
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