Kinetic Hydrogen Isotope Effects in the Ionization of some Nitroparaffins

Details Kinetic Hydrogen Isotope Effects in the Ionization of some Nitroparaffins Kinetic Hydrogen Isotope Effects in the Ionization of some Nitroparaffins

Oct 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966rspsa.294..273b&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 294, Issue 1438, pp. 273-297

Physics

4

Scientific paper

Values are reported for the kinetic hydrogen isotope effects for proton-transfer reactions between hydroxide ions and nitromethane, nitroethane, nitrocyclohexane and 2-nitropropane, and between 2-nitropropane and pyridine, 2,6-lutidine and acetate ions. In conjunction with earlier work the results suggest that the isotope effect has a maximum value for proton transfers between two acid-base systems of approximately equal pK, in agreement with theoretical predictions. We have confirmed that the abstraction of a proton from 2-nitropropane by 2,6-lutidine exhibits an abnormally high isotope effect (k H/k D = 20), probably attributable to a considerable tunnelling correction.

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