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Derivatives of aziridine or ethylenimine are isomerized by acids, nucleophilic reagents, or pyrolysis. All of the isomerizations reported so far are ring-opening reactions, predominantly involving cleavage of the carbon-nitrogen bond of the ring, although a few isomerizations are known in which the carbon-carbon bond of the ring is broken. Isomerization of ap-propriate aziridine derivatives provides useful synthetic pathways leading to heterocyclic systems such as oxazolines, imidazolines (and related systems), imidazolidinones, thiazofines, pyrazolines, and triazolines. Other isomerizations form N-unsaturated amides, anils, and isocyanates.

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