Base catalysed rearrangements involving ylide intermediates. Part 10. The effects of torsional strain in the transition state upon [1,2] and [3,2] rearrangements
作者:W. David Ollis、Ian O. Sutherland、Yodhathai Thebtaranonth
DOI:10.1039/p19810001963
日期:——
sigmatropic rearrangements of the bicyclic ammonium ylides (8), (11), and (14) are inhibited by the bicyclic framework which prevents correct orbital alignment for π-bonding in the transition state for a concerted [3,2] sigmatropic rearrangement or in the vinylogous nitroxide component of the radical pair required as an intermediate in a [1,2] sigmatropic rearrangement. The ylides (14a) and (14d), based upon