Beckmann reaffangement of oximes is catalyzed with tetrabutylammonium perrhenate(VII), trifluoromethanesulfonic acid and hydroxylamine hydrochloride in nitromethane under azeotropic conditions, giving amides in high yield.
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[1]
Gawley R.E, 2004, ORG REACT, DOI 10.1002/0471264180.or035.01