An alternative way for making saccharin is from methyl ester o-aminobenzoic (anthranylic acid). This undergoes diazotization using nitrous acid, and the resulting diazonium salt (3.2.71) is reacted with sulfur dioxide in the presence of copper dichloride, forming the methyl ester o-sulfobenzoic acid (3.2.72). Reaction of the resulting product with chlorine gives o-chlorosulfonylbenzoic acid methyl ester (3.2.73), which upon reaction with ammonium gives o-sulfonylamidobenzoic acid methyl ester (3.2.74). In the presence of hydrogen chloride, the resulting product undergoes cyclization into saccharin (3.2.70).
ft cooch3 NaNO2/HCl ^-./COOCH
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