2,6-Dichloroindophenol Sodium
Structural Formula Vector Image
Title: 2,6-Dichloroindophenol Sodium
CAS Registry Number: 620-45-1
CAS Name: 2,6-Dichloro-4-[(4-hydroxyphenyl)imino]-2,5-cyclohexadien-1-one sodium salt
Additional Names: sodium 2,6-dichloroindophenol; sodium 2,6-dichloro-N-(p-hydroxyphenyl)-p-benzoquinone imine; 2,6-dichloro-1,4-benzoquinone-4-(4-hydroxyanil) sodium; 2,6-dichlorophenol-indophenol sodium; Tillman's reagent
Molecular Formula: C12H6Cl2NNaO2
Molecular Weight: 290.08
Percent Composition: C 49.69%, H 2.08%, Cl 24.44%, N 4.83%, Na 7.93%, O 11.03%
Literature References: Prepd from 2,6-dichloro-p-quinone-4-chlorimide and phenol in alkaline soln: Gibbs et al., Public Health Rep. 40, 650 (1925); Tillmans et al., Z. Unters. Lebensm. 56, 273 (1932).
Properties: Dark green powder. May contain up to 2 mols H2O. Freely sol in water, alc. The aq soln is deep blue, changed to red by acids. It liberates iodine from KI in acid solns.
Use: Analytical reagent in the determination of ascorbic acid (vitamin C) which reduces the dye to a colorless hydroxy compd.

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