The cyclohexane-1,4-diyl mechanism for Cope rearrangements. Phenyl substitution in the oxy-Cope system
Abstract
Phenyl substituted oxy-Cope systems give rate ratios for the two competing components which rule out the intermediacy of cyclohexane-1,4-diyl diradicals in these rearrangements, although such intermediates have recently been implicated in the rearrangements of some phenyl hexa-1,5-dienes.