Two convenient methods for the preparation of p-dialkylaminophenylacetylenes are reported: a) Dehydrobromination of the brominated compounds obtained easily from the dialkylamino substituted cinnamic acids in acetic acid instead of chloroform; b) dehydrochlorination of the 2-chlorostyrene derivative obtained from the reaction of p-dimethylaminobenzaldehyde with chloromethylenetriphenylphosphorane.

The acetylenic analogs of malachite green, crystal violet, and their related compounds have been synthesized to examine an effect of an acetylenic bond on a dye system.

1-Arylethyltriphenylphosphonium bromides thermally rearranged to 2-arylethyltriphenylphosphonium bromides. Direct formation of 2-arylethylphosphonium bromides was achieved by reacting styrene, HBr, and triphenylphosphine. On the other hand, thermolysis of 1-indanyltriphenylphosphonium bromide gave indene and triphenylphosphonium bromide. From deuterium and 13C-labeled experiments, the interconversion of primary and secondary cation intermediates was suggested. No neighboring phenyl group (phenonium cation intermediate) interaction was observed.

Das Tetrazin (II), erhalten aus dem Chlorhydrazon (I), wird thermisch zersetzt.

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