Acid catalysed stereomutations about the C(2)–C(3) bond of 3-aryl-1-methoxyallyl cations. Dication formation by oxygen protonation
Abstract
The thermally induced cis to trans isomerization of 3-aryl-1-methoxyallyl cations in superacid media is shown to occur by formation of an intermediate O-protonated dication.