Process for producing saccharin

Details Process for producing saccharin Process for producing saccharin

1976-04-15

1977-11-08

Gallagher, R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260327S, 260507R, 260544S, 560 17, 560 14, 560 12, C07D27506

Patent

active

040575551

ABSTRACT:
1,2-Benzoisothiazole-3-on-1, 1-dioxide having the formula ##STR1## wherein X represents hydrogen, halogen, nitro, lower alkyl or lower alkoxy and Y represents hydrogen, halogen, lower alkyl, or lower alkoxy is prepared by reacting phosgene with an o-sulfobenzoic acid compound having the formula: ##STR2## or an alkali metal salt or alkaline earth metal salt thereof in the presence of dimethylformamide, thereby producing a mixture of a dichlorotolylsultone and a chlorosulfonylbenzoylchloride; (b) reacting the reaction products of step (a) with an alcohol of the formula ROH wherein R represents a lower alkyl group; and then (c) reacting the product of step (b) with ammonia.

REFERENCES:
patent: 564784 (1896-07-01), Fahlberg

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