Triethylamine → 4H-1-Benzopyran-4-one, 2,3-dihydro-, oxime

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Reaction Steps

To a solution of 4-chromanone (10 g, 67.6 mmol) in methanol (150 mL) was added triethylamine (15 mL, 108.1 mmol) and hydroxylamine hydrochloride (7.5 g, 108.1 mmol). The mixture was stirred at rt for 16 hrs. The solvent was evaporated giving a residue which was dissolved in ethyl acetate and extracted with water. The organic layer was separated and dried over anhydrous sodium sulfate. Evaporation of the filtrate afforded chroman-4-one oxime (16.1 g, 100%) as a white crystalline solid. MS: 164.0 (M+H)+; tR=1.99 min (method 1).

Provenance & Evidence