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The structure of 2-arylamino-2-thiazolines, analogous thiazines and their amides—X. An IR and NMR investigation of the N-methyl derivatives

✍ Scribed by P. Sohár; L. Toldy

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
192 KB
Volume
4
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The isomer‐pairs of the 2‐arylamino‐2‐thiazolines and ‐thiazines, carrying a methyl substituent on the nitrogen atom of the ring and outside the ring were synthesised by unambiguous routes. An IR and NMR investigation of these compounds revealed the fact that the NMR signal of the 2,6‐symmetrically substituted aryl group can be used advantageously for the determination of the isomeric structures. The AB~2~ multiplet of the aromatic protons is shifted towards the AX~2~ pattern in the b isomer—containing a conjugated CN bond outside the ring—as compared to the a isomers. The structure of this multiplet does not depend on the size of the hetero‐ring.

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