Indophenol
- Phenolindophenol
- N-(4 -hydroxyphenyl )-p- benzochinonmonoimin
- 4 - (4 -hydroxyphenyl) iminocyclohexa - 2, 5 - dien- 1-one
Red needles or metallic luster, brown leaves
Fixed
160 ° C.
Readily soluble in hot water, dilute hydrochloric acid and dilute sodium carbonate solution
Attention
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Indophenol and phenolindophenol, one of the quinoid dyes.
Production and representation
Indophenol can be prepared by oxidative coupling of p-aminophenol with phenol in an alkaline solution containing sodium hypochlorite as the oxidant.
Properties
Indophenol is a redox indicator. By reducing indophenol can be reversibly converted into the colorless leuco compound.
Use
The 2,6- dichlorophenol indophenol derivative ( Tillman 's reagent ) is used as a redox indicator for the detection of ascorbic acid.
More indophenol derivatives occur when: