Sulfuric Acid → HCID 72739086, compound

Participants

Reaction Steps

A mixture of 2.1 liters of methanolic solution of 760 g of 1-(2,2-dimethoxyethoxy)-4-(2-ethoxyethyl)-2,3-dimethylbenzene and 2.1 liters of aqueous solution of 466 g of hydroxylamine sulfate was heated to 70 C. To the mixture added was 12 N sulfuric acid until the pH became 0.5, and the mixture was stirred vigorously. Since the pH is lowers with the progress of the reaction, an aqueous 12 N sodium hydroxide solution was added dropwise so as to maintain pH at 0.5. The reaction was monitored by HPLC, and when the conversion exceeded 95%, the reaction mixture was cooled to around room temperature. Generally, the reaction requires about 10 hours. After pH was adjusted to 6.5 with 12 N-NaOH, the solid formed was filtered. The filtered product was washed with 1.0 liter of warm water, and dried under reduced pressure to obtain the title product. m.p. 102°-105° C., amount obtained 676 g, purity 93%, yield 93%.

Provenance & Evidence