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Spectroscopic studies on N,N-dimethylamides—V Amide-rotational barriers from iterative total line shape analysis of N,N-dimethylcyclopropanecarboxamides

✍ Scribed by K. Spaargaren; P. K. Korver; P. J. van der Haak; Th. J. de Boer

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
386 KB
Volume
3
Category
Article
ISSN
0749-1581

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✦ Synopsis

hide-rotational barriers in some 2-substituted N,N-dimethylcyclopropanecarboxamides in CDCl, as a solvent (0.25 M) were obtained with an iterative total line shape analysis.

N,N-dimethylcyclopropanecarboxamide

shows a barrier AGZ,., = 16.72 i 0.01 kcal/mole. Para-nitro substitution in (trans)-2-phenyl-N,Ndimethylcyclopropanecarboxamide raises the barrier AGZ,., from 17.08 0.01 to 17.40 & 0.02 kcal/mole. * Part IV, ref. 1. t Part of the thesis of K. Spaargaren, Amsterdam 1970.

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## Abstract Rotational barriers in 21 __p__‐ and __m__‐substituted __N__,__N__‐dimethylbenzamides in CDCl~3~ as solvent have been determined using the intensity ratio method of Woodbrey. These data compare very well with values from the literature^1^ obtained with a total line shape analysis. From