Rate constants for the addition of the 2-cyano-2-propyl radical to alkenes in solution
作者:K. H?berger、H. Fischer
DOI:10.1002/kin.550250405
日期:1993.4
AbstractAbsolute rate constants for the addition of the 2‐cyano‐2‐propyl radical to 26 alkenes CH2=CXY at 315 K were determined in solution by time‐resolved electron‐spin‐resonance spectroscopy. They vary with the alkene substituents from 30 M−1 s−1 to 7′010 M−1 s−1. For styrene the temperature dependence is given by log k/M−1 s−1 = 7.7 − 26.1/Θ where Θ = 2.303 RT in kJ/mol. An analysis of the substituent effects in terms of polar and enthalpic factors reveals a dominant influence of the overall reaction enthalpy. © 1993 John Wiley & Sons, Inc.