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Methylphenylpropargyl-(3-phenylpropargyl)-ammonium bromide salts are cyclized almost quantitatively under base-catalysis conditions with the formation of 2-methyl-2-phenylbenz[f]isoindolinium bromide. The allyl analog is subject to rearrangement-decomposition, to a Stevens rearrangement, and to nucleophilic substitution, the cyclic product being obtained in low yield. Methylphenylpropargyl-(3-vinylpropargyl)ammonium bromide is mainly cyclized, but the 3-isopropenylpropargyl analog of this salt is subject to cyclization and subsequent decomposition under analogous conditions.

It has been shown that, under basic catalytic conditions, dimethylpropargylallyl-(1-allyl-3 phenylpropargyl)- and-(1-allyl-3-α-naphthylpropargyl)atnmoniutn salts undergo diene synthesis type intratnolecular cyclization to form condensed analogs of isoindolenium and dihydroitulolenium salts with an allyl substituent at position 1.

It was shown that dialkylpropargyl/3-(p-chlorophenyl)-2,3-dichloroallyl/ammonium salts in an aqueous alkali medium undergo cyclization-dehydrochlorination to give chlorine-containing benzisoindolinium salts. When the ammonium salt contains simultaneously 3-phenyl (or vinyl)propargyl and 3-(p-chlorophenyl)-2,3-dichloroallyl groups, only the latter enters into the cyclization as the diene fragment.