INFRARED AND 1H-NMR STUDY OF MOLECULAR CONFORMATION OF SOME N,N'-ARYLALKYLUREAS
The 270 MHz 1H-NMR and IR spectra of several N,N'-arylalkylureas are analyzed in terms of their conformational properties.For most systems, the -NHCONH- group adopts a less energetic trans-cis conformation which is stabilized by unsymmetric intramolecular hydrogen bonding of lower polarizability, in contrast ot other N,N'-disubstituted ureas which are predominantly found in the trans-trans form.The influence of the N-substituent on hydrogen bonding and molecular conformation is emphasized.
Sudha, L. V.,Sathyanarayana, D. N.
p. 89 - 96
(2007/10/02)
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