5-chloro-2-(2,4-dichlorophenoxy)phenol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-hexadecanoyloxy-1-(hexadecanoyloxymethyl)ethyl 4-chloroformyl-3,3-dimethylbutyrate (F) (1.5 g.), triclosan (0.4 g.) and pyridine (0.17 ml.) in methylene chloride (35 ml.) was stirred at 0°-5° C. for 3 hours and then allowed to attain ambient temperature during 45 hours. The methylene chloride was evaporated and replaced by ether (50 ml.). The mixture obtained was washed successively with water (3×20 ml.), 2M hydrochloric acid (25 ml.), saturated sodium hydrogen carbonate solution (2×20 ml.) and water (2×20 ml.), and then dried (MgSO4) and evaporated. The oil obtained crystallised on treatment with ethanol to give 5-chloro-2-(2,4-dichlorophenoxy)phenyl 4-[2-hexadecanoyloxy-1-(hexadecanoyloxymethyl)ethoxycarbonyl]-3,3-dimethylbutyrate as white crystals (0.3 g.), (m.p. just below 20° C.); NMR (CDCl3): 0.7-1.0 (6H, m, CH3CH2), 1.12 (6H, s, CCH3), 1.15-1.7 (52H,m, CH2), 2.17 (4H, m, CH2CH2CO), 2.44 (2H,s, CH2CO2CH), 2.60 (2H, s, aromatic O.CO CH2), 3.9-4.4 (4H, m, CH2O), 5.1-5.4 (1H, m, CH2CO2CH), 6.9-7.5 (6H, m, aromatic H)ppm. to attain ambient temperature during 45 hours The methylene chloride was evaporated The mixture obtained was washed successively with water (3×20 ml.), 2M hydrochloric acid (25 ml.), saturated sodium hydrogen carbonate solution (2×20 ml.) and water (2×20 ml.) dried (MgSO4) evaporated The oil obtained crystallised on treatment with ethanol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-hexadecanoyloxy-1-(hexadecanoyloxymethyl)ethyl 4-chloroformyl-3,3-dimethylbutyrate (F) (1.5 g.), triclosan (0.4 g.) and pyridine (0.17 ml.) in methylene chloride (35 ml.) was stirred at 0°-5° C. for 3 hours and then allowed to attain ambient temperature during 45 hours. The methylene chloride was evaporated and replaced by ether (50 ml.). The mixture obtained was washed successively with water (3×20 ml.), 2M hydrochloric acid (25 ml.), saturated sodium hydrogen carbonate solution (2×20 ml.) and water (2×20 ml.), and then dried (MgSO4) and evaporated. The oil obtained crystallised on treatment with ethanol to give 5-chloro-2-(2,4-dichlorophenoxy)phenyl 4-[2-hexadecanoyloxy-1-(hexadecanoyloxymethyl)ethoxycarbonyl]-3,3-dimethylbutyrate as white crystals (0.3 g.), (m.p. just below 20° C.); NMR (CDCl3): 0.7-1.0 (6H, m, CH3CH2), 1.12 (6H, s, CCH3), 1.15-1.7 (52H,m, CH2), 2.17 (4H, m, CH2CH2CO), 2.44 (2H,s, CH2CO2CH), 2.60 (2H, s, aromatic O.CO CH2), 3.9-4.4 (4H, m, CH2O), 5.1-5.4 (1H, m, CH2CO2CH), 6.9-7.5 (6H, m, aromatic H)ppm. to attain ambient temperature during 45 hours The methylene chloride was evaporated The mixture obtained was washed successively with water (3×20 ml.), 2M hydrochloric acid (25 ml.), saturated sodium hydrogen carbonate solution (2×20 ml.) and water (2×20 ml.) dried (MgSO4) evaporated The oil obtained crystallised on treatment with ethanol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 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. washed first with 2M hydrochloric acid (50 ml.) The ether phase was dried (MgSO4) evaporated A portion (20 g.) of the residual oil was purified by chromatography on silica gel

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 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. washed first with 2M hydrochloric acid (50 ml.) The ether phase was dried (MgSO4) evaporated A portion (20 g.) of the residual oil was purified by chromatography on silica gel

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of triclosan (29.0 g.), triethylamine (15 ml.) and 2,2-dimethylglutaric anhydride (20 g.) was heated at 80° C. for 5 hours. A further quantity (2.0 g.) of anhydride and triethylamine (1 ml.) were added and heating continued for 24 hours. The mixture was cooled to ambient temperature, washed with 2M hydrochloric acid (100 ml.), then with water (3×80 ml.) and dried (MgSO4). The solution obtained was evaporated. The brown residual oil was dissolved in hot cyclohexane. The solution on cooling gave white crystals which were recrystallised from cyclohexane/petrol 60-80 to give 5-chloro-2-(2,4-dichlorophenoxy)phenyl 4-carboxy-2,2-dimethylbutyrate (C') (12.7 g.), m.p. 125°-128° C. heating The mixture was cooled to ambient temperature washed with 2M hydrochloric acid (100 ml.) with water (3×80 ml.) and dried (MgSO4) The solution obtained was evaporated The brown residual oil was dissolved in hot cyclohexane The solution on cooling gave white crystals which were recrystallised from cyclohexane/petrol 60-80

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of triclosan (29.0 g.), triethylamine (15 ml.) and 2,2-dimethylglutaric anhydride (20 g.) was heated at 80° C. for 5 hours. A further quantity (2.0 g.) of anhydride and triethylamine (1 ml.) were added and heating continued for 24 hours. The mixture was cooled to ambient temperature, washed with 2M hydrochloric acid (100 ml.), then with water (3×80 ml.) and dried (MgSO4). The solution obtained was evaporated. The brown residual oil was dissolved in hot cyclohexane. The solution on cooling gave white crystals which were recrystallised from cyclohexane/petrol 60-80 to give 5-chloro-2-(2,4-dichlorophenoxy)phenyl 4-carboxy-2,2-dimethylbutyrate (C') (12.7 g.), m.p. 125°-128° C. heating The mixture was cooled to ambient temperature washed with 2M hydrochloric acid (100 ml.) with water (3×80 ml.) and dried (MgSO4) The solution obtained was evaporated The brown residual oil was dissolved in hot cyclohexane The solution on cooling gave white crystals which were recrystallised from cyclohexane/petrol 60-80