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What structural or electronic aspect of (2E)-1-(4-Nitrophenyl)-3-(2-pyridinyl)-2-propen-1-one prevents the resonance argument and empirical parameters from adequately predicting the...

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Chemistry

What structural or electronic aspect of(2E)-1-(4-Nitrophenyl)-3-(2-pyridinyl)-2-propen-1-one prevents theresonance argument and empirical parameters from adequatelypredicting the H-NMR chemical shifts of the alpha C-H?

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Predicting the chemical shiftof the olefinic hydrogensdouble bond hydrogens specially alphahydrogen from carbonyl is very tedious Several electronic andstructural effects play a rolea had it been pure sp2 olefinic    See Answer
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