Hydrochloric Acid → HCID 178436837、化合物

関与物質

反応条件

反応手順

0.388 mol (25.9 g) hydroxy urea were dissolved in 195 ml 2 M HCl, 80 ml of methanol were added and 0.388 mol (56.7 g) of 1,1-dimethoxypentane-3-on (62% content in product mixture) were added dropwise under cooling with the internal temperature being maintained at −6 to −7° C. The solution was thawed to room temperature in an ice bath and stirred for 1 h, then evaporated until dryness. The residue was suspended with 100 ml of acetone, the mixture was cooled to below 0° C. in an ice/ethanol bath, the solid filtered off and washed with little ice-cold acetone. After drying 32.6 g crude product were obtained. The crude product was heated until boiling with 200 ml ethanol, hot filtered and slowly cooled to −18° C. The precipitated solid was filtered off, washed with a little amount of ethanol and dried. 11.7 g of the title compound were obtained.

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