Triclosan → 5-Chloro-2-(2,4-dichlorophenoxy)phenyl 4-carboxy-3-methylbutyrate

Participants

Reaction Steps

A mixture of triclosan (22.3 g.), 3-methylglutaric anhydride (15.0 g.) and triethylamine (15 ml.) in ether (250 ml.) was stirred for 20 hours, and then washed first with 2M hydrochloric acid (50 ml.) and then with water (3×150 ml.). The ether phase was dried (MgSO4) and evaporated. A portion (20 g.) of the residual oil was purified by chromatography on silica gel using methylene chloride as eluant to give (D) as a colourless oil (7.4 g.) ; NMR (CDCl3): 0.8-1.3 (3H,d, CH3), 2.1-2.8 (5H,m,CH2CO+CH3CH), 6.7-7.6 (6H, m, aromatic H), 11.25 (1H,s, CO2H)ppm.

Provenance & Evidence