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13C nuclear magnetic resonance of some derivatives of phenothiazines, pyridobenzothiazines and phenoxazines

✍ Scribed by Misa V. Jovanovic; Edward R. Biehl

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
773 KB
Volume
22
Category
Article
ISSN
0749-1581

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✦ Synopsis

Natnral abundance 13C NMR studies were carried out on a series of phenothiazines, pyridobenzothiazines and phenoxazines. Chemical shift assignments were made on the basis of models, coupling patterns and aromatic substituent effects. For most of the compounds studied, substituents influence only the carbon chemical shifts of the substituted carbocyclic ring, while the chemical shifts of the unsubstituted ring are essentially the same as those of the parent heterocyclic compound. However, the 10-acetyl and 4'-nitro-l0phenyl groups affect the chemical shifts of several of the carbon atoms in the phenothiazine nucleus. An explanation in terms of resonance interactions between these groups and the N-10 lone-pair electrons is presented.

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