Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Chemical shifts and coupling constants are reported for seven azole derivatives (imidazoles, triazoles and their benzo derivatives), their quaternary salts and the corresponding dicyanomethylides. The assignment of the heterocyclic carbons is based on couplings with the N-methyl group. Compared with neutral azoles the quaternary salts show irregular effects for the chemical shifts. On the other hand, the 13C chemical shifts of dicyanomethylides are similar to those of N-methyl quaternary salts.
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