ethyl N-(4-hydroxyphenyl)carbamate

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: 20 g of 4-aminophenol (Mw=109.13; 0.18324 mol) are suspended in 200 cm3 of anhydrous dichloromethane, under an inert atmosphere. The suspension is cooled to a temperature of 0° C. in a bath of ice and 16.4 cm3 of anhydrous pyridine (Mw=79.10; d=0.981; 0.2034 mol) are then added. 17.6 cm3 of ethyl chloroformate (Mw=108.53; d=1.13; 0.18324 mol) are then added dropwise so as to keep the mixture at a temperature below 10° C. The reaction mixture is kept stirring for two hours. The mixture is poured onto one liter of ice-cold water and then extracted with ethyl acetate. The organic phase is washed with water and then dried, filtered and evaporated under vacuum. After recrystallization from a heptane/ethyl acetate mixture, 21 g of a white powder are obtained, which corresponds to a yield of 63%. The melting point of the product obtained is 127.2° C. The H NMR spectrum and the elemental analysis are in accordance with the expected product. are then added at a temperature below 10° C extracted with ethyl acetate The organic phase is washed with water dried filtered evaporated under vacuum After recrystallization from a heptane/ethyl acetate mixture, 21 g of a white powder are obtained The melting point of the product obtained is 127.2° C

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

Procedure: p-aminophenol 33.36 g (0.3 mole) and 12 g NaOH were dissolved in 120 ml water and cooled to ice salt bath temperature. To the stirring solution, 24 ml ethylchloroformate were slowly added. A white precipitate was found. One gram sodium dithionite was added and mixed. The solid was filtered by suction and washed with cold water (50 ml). Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°. cooled to ice salt bath temperature mixed The solid was filtered by suction washed with cold water (50 ml) Recrystallization from hot water gave a crystalline powder, 48.3 g (89%), MP 120°-123°

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

Procedure: 20 g of 4-aminophenol (Mw=109.13; 0.18324 mol) are suspended in 200 cm3 of anhydrous dichloromethane, under an inert atmosphere. The suspension is cooled to a temperature of 0° C. in a bath of ice and 16.4 cm3 of anhydrous pyridine (Mw=79.10; d=0.981; 0.2034 mol) are then added. 17.6 cm3 of ethyl chloroformate (Mw=108.53; d=1.13; 0.18324 mol) are then added dropwise so as to keep the mixture at a temperature below 10° C. The reaction mixture is kept stirring for two hours. The mixture is poured onto one litre of ice-cold water and then extracted with ethyl acetate. The organic phase is washed with water and then dried, filtered and evaporated under vacuum. After recrystallization from a heptane/ethyl acetate mixture, 21 g of a white powder are obtained, which corresponds to a yield of 63%. The melting point of the product obtained is 127.2° C. The 1H NMR spectrum and the elemental analysis are in accordance with the expected product. are then added at a temperature below 10° C extracted with ethyl acetate The organic phase is washed with water dried filtered evaporated under vacuum After recrystallization from a heptane/ethyl acetate mixture, 21 g of a white powder are obtained The melting point of the product obtained is 127.2° C