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078ChemInform Abstract The reaction between N2O4 (II) and phenylcyclopropane (Ia) and its p-alkylsubstituted derivatives (Ib) proceeds at -30 rc C regiospecifically at the cyclopropyl moiety. The formed adducts are stable only at low temperature. On warming to room temperature they decompose to give mixtures of the benzaldehydes (III), the cinnamic aldehydes (IV) and the 5-arylisoxazolines (V). The formation of the primary adducts and of the products (III)-(V) is discussed.

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