Structural Formula Vector Image
Title: Halazone
CAS Registry Number: 80-13-7
CAS Name: 4-[(Dichloroamino)sulfonyl]benzoic acid
Additional Names: p-(dichlorosulfamoyl)benzoic acid; p-sulfondichloramidobenzoic acid; p-carboxybenzenesulfondichloroamide
Trademarks: Pantocid (Abbott)
Molecular Formula: C7H5Cl2NO4S
Molecular Weight: 270.09
Percent Composition: C 31.13%, H 1.87%, Cl 26.25%, N 5.19%, O 23.69%, S 11.87%
Literature References: Prepd by chlorination of p-sulfamylbenzoic acid in alkaline medium; product is a mixture of mono- and dichloroamides with the dichloro compd predominating: Proschko, DE 492249; Chem. Zentralbl. 101, I, 2630 (1930); US 1697139 C.A. 23, 1138 (1929); Claas, DE 318899; Chem. Zentralbl. 91, IV, 14 (1920). Improved synthesis: M. Saljoughian, M. T. Sadeghi, Monatsh. Chem. 117, 553 (1986). Water disinfection study: R. Kfir et al., Water Sci. Technol. 21, 207 (1989). Review of use as antiseptic in water disinfection: J. T. O'Connor, S. K. Kapoor, J. Am. Water Works Assoc. 62, 80-84 (1970).
Properties: Crystals or white powder, dec about 195°. Odor of chlorine. Slightly sol in water, chloroform (differing from dichloramine-T which is very sol in chloroform). Sol in glacial acetic acid and in solns of alkali hydroxides and of alkali carbonates with the formation of a salt.
Use: Water disinfectant.

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