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NMR studies in the heterocyclic series xxv—13C NMR spectra of some azole dicyanomethylides

✍ Scribed by Mikael Begtrup; José Elguero; Enrique Díez-Barra; Carmen Pardo

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
314 KB
Volume
23
Category
Article
ISSN
0749-1581

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✦ Synopsis

Chemical shifts and coupling constants are reported for seven azole derivatives (iidamles, triazoles and their b e m 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 -C chemical shifts of dicyanomethylides are similar to those of N-methyl quaternary salts.

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