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The participation of halogen substituted 3-aryl-phthalazinium-I-olates in cycloaddition reactions were studied with various olefinic and acetylenic dipolar0 hiles The betaines gave the expected cycloadducts with vin I acetate, vinyl phenyl ether, and vinyl plenyl 'sulfide. However, two isomeric products were obtaineJ with diethyl acetylenedicarboxylate. One of them was the normal expected cycloadduct and the other one was the rearranged cycloadduct. On the other hand, reactions with phenyl acetylene produced only the rearranged cycloadducts.

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