The effect of σ-polarisation on π-electron-density distributions is discussed, and it is shown that an approximate method of allowing for this type of σ–π interaction gives a π-electron distribution for pyridine in good agreement with that obtained by an ab initio SCF calculation.
J. W. Emsley, J. Chem. Soc. A, 1968, 2523 DOI: 10.1039/J19680002523
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