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Nuclear magnetic resonance studies of hindered internal rotation in higher N,N-dialkylamides and -thionamides

✍ Scribed by Siddall, Thomas H.; Stewart, William Esley; Knight, F. D.

Book ID
120188336
Publisher
American Chemical Society
Year
1970
Tongue
English
Weight
396 KB
Volume
74
Category
Article
ISSN
0022-3654

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## Abstract The NMR variable temperature behaviour of __N__‐aroyl‐ and __N__‐thioaroyl‐__N__′‐piperonylpiperazines was investigated. The largest chemical shift separation between the exchanging methylene groups, and the highest energy barrier, is found for the thioamide compounds. Results from semi