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http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18806| Title: | Kinetic Isotope Effects in the Reactions of 4-Nitrophenylnitromethane with Alkylamidine Bases in Toluene |
| Authors: | Caldin, Edward F. Rogne, Otto Wilson, Christopher J. |
| Keywords: | Chemistry Kinetic Isotope Effect Alkylamidine Bases Journal of the Chemical Society : Faraday Transaction - I |
| Issue Date: | 1978 |
| Publisher: | Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (07) |
| Abstract: | Kinetic isotope effects have been determined for the proton-transfer and deuteron-transfer reactions of 4-nitrophenylnitromethane (4-NPNM; NO2C6H4CH2NO2, NO2C6H4CD2NO2) with two alkylamidine bases [HN = C(NEt2)R; R = n-butyl, n-nonyl] in toluene solution. The observed values of the isotopic rate ratio kHf/kDf at 25°C are 11.7 ± 1.0 and 8.0 ± 0.3, respectively. The former value indicates an appreciable tunnel correction; this is confirmed by a value of (ΔH[graphic omitted]D-ΔH[graphic omitted]H)= 2.5 ± 0.8 kcal mol–1(10 ± 3 kJ mol–1). The isotopic differences are not precise enough to allow calculations of the dimensions of the energy barrier. |
| URI: | http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18806 |
| Appears in Collections: | Journal Articles (before-1995) |
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|---|---|---|---|---|
| 1796-1803.pdf Restricted Access | 567.33 kB | Adobe PDF | View/Open Request a copy |
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