The role of cyclohexadienones in the thermal sigmatropic rearrangements of 2-oxidoanilinium ylides
作者:W. David Ollis、Ratnasamy Somanathan、Ian O. Sutherland
DOI:10.1039/c39810000573
日期:——
Thermal isomerisation of N-allyl-2-oxidoani-linium ylides under mild conditions yields three products which are each formed by two types of competitive pathways; the minor pathway involves a radical pair intermediate and three modes of coupling, and the major pathway involves a collection of concerted sigmatropicrearrangements.
Base catalysed rearrangements involving ylide intermediates. Part 13. Further rearrangements of 2-oxidoanilinium ylides
作者:W. David Ollis、Ratnasamy Somanathan、Ian O. Sutherland
DOI:10.1039/p19810002930
日期:——
The 2-oxidoanilinium ylides (7) rearrange on heating to give the ethers (10) together with the dienones (8) and the phenols (11) for cases where the aromatic ring has a 5-alkyl substituent or a mixture of the dienones (8) and (12) for cases where the aromatic ring is 3,5-disubstituted. A study of the deuteriated ylides (25) shows that these reactions involve competing concerted and radical-pair processes