Process for the preparation of 6-methyl-3,4-dihydro-1,...

Details Process for the preparation of 6-methyl-3,4-dihydro-1,... Process for the preparation of 6-methyl-3,4-dihydro-1,...

C - Chemistry, Metallurgy

07

D

260/243

C07D 291/06 (2006.01)

Patent

CA 1283911

Abstract of the disclosure: Acetoacetamide-N-sulfonic acid and its salts are cyc- lized with at least approximately the equimolar amount of SO3 in short times, preferably in special appara- tus, to give 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4- one 2,2 dioxide. In the case where more than the equimolar amount of SO3 is used, the latter compound is produced as an SO3 adduct which then needs to be hydrolyzed; the hydrolysis also takes place in short times and, particularly advantageously, in apparatus of the same type as for the cyclization. The non-toxic salts, especially the potassium salt - of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2- dioxide are valuable synthetic sweeteners.

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