Journal of Organic Chemistry p. 2235 - 2241 (1982)
Update date:2022-09-26
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Kovach, Ildiko M.
β-Deuterium isotope effects (β-DIE) determined in acetonitrile for the following reactions are: CH3COO- + 4-NO2C6H4O2CCL3 (L = H, D) (PNPA-L3), 0.958 +/- 0.007 (5-45 deg C); CH3COO- + 2,4-(NO2)2C6H3O2CCL3 (DNPA-L3), 0.964 +/- 0.011 (5-20 deg C; OH(1-) + PNPA-L3, 0.972 +/- 0.028 (25 deg C); 4-NO2C6H4O- (PNP-) + CL3COOCOCL3, 1.00 +/- 0.02 (20 deg C); 4-NO-C6H4O- (PNOP-) + CL3COOCOCL3, 1.00 +/- 0.03 (20 deg C). β-DIEs in benzene for two of these reactions are: CH3COO- + PNPA-L3, 0.957 +/- 0.045 (10-20 deg C); CH3COO- + DNPA-L3, 0.985 +/- 0.050 (5-10 deg C).The fraction of tetrahedral character at the transition state (TS) deduced from β-DIEs for reactions of CH3COO- + PNPA is 0.32 in both CH3CN and benzene, of CH3COO- + DNPA is 0.28 in CH3CN and 0.12 in benzene, and of OH- + PNPA is 0.21 in CH3CN.These values are similar to what is found in water and indicate TSs of essentially trigonal geometry.Isotope effects
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(1983)