Perturbations by Phenyl on the 1,5-Hydrogen Shift in 1,3(<i>Z</i>)-Pentadiene. Another Chameleonic Transition Region?
作者:William von E. Doering、Edmund J. Keliher、Xin Zhao
DOI:10.1021/ja040106k
日期:2004.11.1
The acyclic 1,5-dienyl hydrogen shift is accelerated by radical-stabilizing phenyl substituents without regard to the type of position occupied in the 1,3(Z)-pentadiene system. 1-Phenyl-5-p-tolyl-1,3(Z)-pentadiene has a corrected energy of activation 5.8 kcal mol(-)(1) lower than that of the parent, while the 2- and 3-phenyl analogues, examined in cyclic systems specifically designed to obviate the