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• W1963527444 startingPage "1268" @default.
• W1963527444 abstract "Proton-transfer reactions of two systems, ionization of a series of small carbon acids in water (the Pearson system) and reactions of substituted phenylnitromethanes, were examined in detail computationally. Comparison of experimental reactivity and pKa with calculated relative activation barrier and reaction energy for the Pearson system suggested that the origin of the well-know nitroalkane anomaly does not reside in the reactivity but in the equilibrium. For the reactions of substituted phenylnitromethanes, proton transfers among three species, PhCH2NO2, PhCHNO2−, and PhCH═NO2H, were examined, and the role of the aci-nitro species (PhCH═NO2H) was evaluated on the basis of its stability and reactivity. Protonation of PhCHNO2− by H2O was suggested to occur kinetically on the oxygen site, but due to its instability PhCH═NO2H does not contribute to the overall reaction energetics. The protonation of PhCHNO2− under acidic conditions occurs on the oxygen site to give PhCH═NO2H both kinetically and thermodynamically. The aci-nitro species thus formed appears to give PhCH2NO2 via intramolecular H2O-mediated proton transfer, but a possibility of the route through PhCHNO2−−C-protonation would not be fully eliminated." @default.
• W1963527444 created "2016-06-24" @default.
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• W1963527444 date "2009-01-05" @default.
• W1963527444 modified "2023-09-27" @default.
• W1963527444 title "Proton-Transfer Reactions of Nitroalkanes: The Role of <i>aci</i>-Nitro Species" @default.
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• W1963527444 doi "https://doi.org/10.1021/jo8023939" @default.
• W1963527444 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19123838" @default.
• W1963527444 hasPublicationYear "2009" @default.
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