Issue 0, 1969

The effect of substituents upon proton coupling constants in substituted pyrimidines and benzenes

Abstract

The n.m.r. spectra for carbon tetrachloride and trifluoroacetic acid solutions of 4-pyenylpyrimidine are reported. The azine-ring coupling-constants for the neutral and protonated molecules are compared, and the differences interpreted in terms of delocalisation of the nitrogen lone-pair. Similar arguments involving delocalisation of the C–X bond molecular-orbitals are used to explain the effect of substituents X on the coupling constants in monosubstituted benzenes C6H5X.

Article information

Article type
Paper

J. Chem. Soc. A, 1969, 533-534

The effect of substituents upon proton coupling constants in substituted pyrimidines and benzenes

R. Ditchfield and V. M. S. Gil, J. Chem. Soc. A, 1969, 533 DOI: 10.1039/J19690000533

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