a tThe MI N DO/1 method has been used to study barriers to inversion of trivalent nitrogen, keto-enol tautomerisrn, and chelation by hydrogen bonding in enols from p-dicarbonyl compounds. The results seem to agree quite well with experiment.Austin, Austin, Texas 7871 2, U.S.A. PREVIOUS papers of this series have described a semi-good estimates of heats of formation. In its original empirical SCF MO treatment of compounds formed from form 2b (MINDO/l) the method failed to give correct carbon, hydrogen, nitrogen, and oxygen, based on the molecular geometries. The calculations had to be method' and using parameters chosen to give
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