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DOI: 10.1055/sos-SD-011-00557

Boyd, G. V.Science of Synthesis, (200211447.

Irradiation of 3-aryl-5-phenylisoxazoles 256 with ultraviolet light gives 3-aryl-2-benzoyl-2H-azirines 257, which on further irradiation are converted into 2-aryl-5-phenyloxazoles 258 (Scheme 114).[‌183‌] Prolonged irradiation favors the formation of the oxazole; furthermore, the extent of the second rearrangement is wavelength dependent.

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