Indophenol

Structural formula
General
Surname	Indophenol
other names	Phenol indophenol N - (4-hydroxyphenyl) - p -benzoquinone monoimine 4- (4-hydroxyphenyl) iminocyclohexa-2,5-dien-1-one
Molecular formula	C 12 H 9 NO 2
Brief description	red needles or shiny metallic brown leaves
External identifiers / databases
CAS number 500-85-6 EC number 207-913-5 ECHA InfoCard 100.007.194 PubChem 10379 Wikidata Q412974
properties
Molar mass	199.21 g mol −1
Physical state	firmly
Melting point	160 ° C
solubility	easily soluble in hot water, dilute hydrochloric acid and dilute soda solution
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319-335 P: 261-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Indophenol , also called phenolindophenol , is one of the quinone imine dyes .

Extraction and presentation

Synthesis of indophenol

Indophenol can be produced by the oxidative coupling of p- aminophenol with phenol in an alkaline solution with sodium hypochlorite as the oxidizing agent .

properties

Indophenol is a redox indicator . Indophenol can be reversibly converted into the colorless leuco compound by reduction .

use

The indophenol derivative 2,6-dichlorophenol indophenol ( Tillmans reagent ) is used as a redox indicator for the detection of ascorbic acid .

Further indophenol derivatives are created in:

• Ammonia detection by means of the Berthelot reaction
• Indole detection with the Ehrlich reagent
• Oxidase detection with the NADI reagent

Individual evidence

1. ↑ ^{a b c} Entry on indophenol. In: Römpp Online . Georg Thieme Verlag, accessed on December 28, 2014.
2. ↑ ^{a b} data sheet indophenol from Sigma-Aldrich , accessed on April 5, 2011 ( PDF ).