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MINDO-Forces calculations with complete geometry optimization have been performed on α- substituted acetaldehydes XCH 2 CH=O and their enols (X = H, F, OH, CN, NH 2 , NO 2 , CH 3 , CF 3 , OCH 3 ). All substituents were found to decrease the stability of the acetaldehyde and mostly in the case of electron withdrawing capacity (e. g NO 2  and CF 3 ). This agrees with theoretical calculations, except in the case of F. The substituent effects on the stabilities in this study are compared with results obtained from our previous theoretical calculations on acetyl derivatives. Geometrical parameters, electron densities, and Gibbs free energies are reported.

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Mindo-Forces Study on the Keto-Enol Tautomerism of α-Substituted Acetaldehydes XCH 2 CH=O (X = H, F, Oh, Cn, NH 2 , NO 2 , CH 3 , CF 3 , OCH 3 ): Comparison with Acetyl Derivatives