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Nuclear magnetic resonance study of restricted rotation in 1-tert-butyl-N,N,2,2-tetramethylpropanamine

✍ Scribed by Pierre A. Berger; Charles F. Hobbs

Book ID
104245731
Publisher
Elsevier Science
Year
1978
Tongue
French
Weight
178 KB
Volume
19
Category
Article
ISSN
0040-4039

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✦ Synopsis

Studies of nitrogen inversion and rotation about

the C-N bond by the dynamic NMR method (DNMR) have been the subject of many recent publications (1). These studies have shown that, for the compounds studied to date, the activation parameters are not very sensitive to the extent of steric hindrance around the amino group, and that C-N bond rotation and nitrogen inversion generally occur at comparable rates.

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1H dynamic nuclear magnetic resonance study of hindered internal rotation in N-aroyl- and N-thioaroyl-Nβ€²- piperonylpiperazines
✍ Rois Benassi; Ferdinando Taddei; Amedeo Leonardi; Dante Nardi πŸ“‚ Article πŸ“… 1981 πŸ› John Wiley and Sons 🌐 English βš– 356 KB πŸ‘ 1 views

## 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