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DOI: 10.1055/sos-SD-011-00557

Boyd, G. V.Science of Synthesis, (200211445.

Ring expansion of the azetidin-3-one 250 by the combined action of sodium azide and titanium(IV) chloride in boiling acetonitrile gives the oxazole 251 (Scheme 111), whose structure has been confirmed by X-ray analysis.[‌179‌]

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