Mechanisms for the uncatalyzed and hydrogen ion catalyzed reactions of a simple quinone methide with solvent and halide ions
作者:John P. Richard
DOI:10.1021/ja00012a031
日期:1991.6
from the solvolysis of 4-MeOArC(CF 3 ) 2 OTs in 50:50 (v/v) trifluoroethanol/water, and its reactions with solvent and halide ions have been studied. Rateconstants for the uncatalyzed and hydrogen ion catalyzed reactions of solvent, Cl − , Br − , and I − with 1 to form the respective phenols 4-HOArC(CF 3 ) 2 Y, equilibrium constants for the addition of HI and HBr, and solvent deuterium isotope effects
Structure−Reactivity Relationships for Addition of Sulfur Nucleophiles to Electrophilic Carbon: Resonance, Polarization, and Steric/Electrostatic Effects
作者:Maria M. Toteva、John P. Richard
DOI:10.1021/ja0021868
日期:2000.11.1
to those for addition of substituted alkyl alcohol ROH to the much more electrophilic 1-(4-methoxyphenyl)ethyl carbocation (5+). The larger value of βnuc = 0.32 for addition of ROH to 5+ than βnuc = 0.11 for addition of RS- to 1 shows that there are important differences in the reaction coordinate profiles for these nucleophile addition reac...