Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Acid-catalyzed dienone-phenol rearrangement reactions of 4-methyl-4-cyanocyclohexadienone occur very slowly and give either fragmentation or methyl group migration, not cyano group migration, under non-nucleophilic strongly acidic conditions. ... 100% protonation in H 2 ...