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PPh 3 /I 2 is an efficient reagent for the stereo-controlled deamination of non-activated aziridines, N-H and N-alkyl aziridines, using. The method works gives the corresponding trans-alkenes from both cis and trans-aziridines. A plausible mechanism is proposed for the ring opening and deamination of keto-aziridines in the presence of Ph 3 P/I 2 .

Several N‐acyl‐2‐benzoylaziridines were previously prepared conveniently and used in the preparation of 5‐benzoyl‐2,4‐diaryl oxazolines in the presence of NaI. In this work, synthesis of some trans‐4‐benzoyl‐2,5‐diaryl oxazolines by a regio‐controlled and stereo‐controlled reaction in the presence of Iron (III) nitrate at room temperature is reported. A plausible mechanism has been proposed for ring expansion of N‐acylaziridines to oxazolines.

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