Geometrical orbital overlap requirements in allowed thermal reactions: the trans,trans Cope rearrangement of 3,7-dideuteriobicyclo[3,3,0]octa-2,6-diene
Abstract
The degenerate trans,trans Cope rearrangement of bicyclo[3,3,0]octa-2,6-diene, although a symmetry-allowed process, does not occur appreciably in 85 min. at 450°.