Abstract
d‐N.M.R.‐Investigation of the Restricted Rotation at the NC(X)‐Bonding Fragment. XII. CN‐Rotational Barrier in Different N‐Substituted Carbamic Acid O‐ethyl EstersThe 1H‐n.m.r. spectra of a series of different N‐substituted urethanes R1R2N‐C(O)OC2H5 are studied at various temperatures. At low temperatures the syn/anti rotamers are assigned by using the LIS‐values of the protons. The thermodynamic parameters ΔGC± of the restricted rotation about the partial C‐N double bond are determined and discussed with regard to inductive, conjugative and homoconjugative effects of the N‐substituents.
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