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The effect of substituents on the enone–dienol tautomerism of but-2-enal by [1,5]-H shift has been investigated systematically. All stationary point structures and energies of substituted but-2-enal are obtained at the levels of B3LYP/6-31G* and B3LYP/6-311++G(d,p). It is shown that the substituents in the 2-substituted series exert more significant effects on the relative energies of dienol with...
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