Process for the preparation of 6-methyl-3,4-dihydro-1, 2,3-oxathiazin-4-one 2,2-dioxide and for the purification thereof

Abstract From the Canadian patent

1-, Abstract of the disclosure:, Process for ?he preparation of the non-toxic salts of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide The non-toxic salts of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide are prepared by cyclizing acetoacetamide-N-sulfonic acid or its salts with an at least approximately equimolar amount of SO3 in the presence of a water-immiscible, inert organic solvent and if, appropriate, also an inert inorganic solvent hydrolyzing, the 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide obtained in the form of the SO3-adduct after the cyclization reaction, in the event that the amount of SO3 employed is more than equimolar, purifying the organic …