Kinetic Analysis of the Rearrangement of a Conformationally Constrained .alpha.-Cyclopropylbenzyl Radical
摘要:
Modulation of the cyclopropylmethyl (CPM)/ homoallyl radical equilibrium by phenyl substitution at the radical center is exploited in determining the kinetic versus thermodynamic preference for bond scission in a bicyclic CPM radical. Exocyclic ring opening is determined to be 28.7 times faster than the respective endocyclic process. This method will be of general use for determining the regioselectivity of radical rearrangements.
Kinetic Analysis of the Rearrangement of a Conformationally Constrained .alpha.-Cyclopropylbenzyl Radical
摘要:
Modulation of the cyclopropylmethyl (CPM)/ homoallyl radical equilibrium by phenyl substitution at the radical center is exploited in determining the kinetic versus thermodynamic preference for bond scission in a bicyclic CPM radical. Exocyclic ring opening is determined to be 28.7 times faster than the respective endocyclic process. This method will be of general use for determining the regioselectivity of radical rearrangements.