Compounds with a phenol group will form a blue, violet, purple, green, or red-brown color upon addition of aqueous ferric chloride. This reaction can be used as a test for phenol groups.
3ArOH + FeCl3 → Fe(OAr)3 + 3HCl
To Conduct Demonstration:
Gloves are recommended.
D.J. Pasto and C.R. Johnson, Laboratory Text for Organic Chemistry, p 410, 1979.
Margaret Asirvatham, Spring 1992.