Download 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. ... In this paper we report the first approach of synthesis of 1H-[1,2,4]triazolo[3,4-a]isoindoles in moderate to good yields by intramolecular annulation of 1-substituted-1,2,4-triazol-4-ium methylides. ... In previous work, monosubstituted cycloimmonium ylides 1 have been identified by ...