Diethyl Ether → 1-Hydroxy-1-(1-methylethyl)-3-(2,4,5-trimethylphenyl)urea

Participants

Reaction Steps

A solution of N-isopropylhydroxylamine hydrochloride (1.85 g, 16.5 mmol) in water (5 mL) was combined with diethyl ether (50 mL) then cooled in an ice bath. A solution of sodium hydroxide (0.72 g, 18 mmol) in water (10 mL) was added over a 10 minute period. The reaction mixture was stirred for 10 minutes then 2,4,5-trimethylphenyl isocyanate (2.42 g, 15 mmol) was added as a solid. The reaction mixture was stirred at ambient temperature for 18 hours. A white solid was isolated by filtration then recrystallized from hexanes/ethyl acetate to provide 2.4 g of the desired product as a white crystalline solid, m.p. 176.2°-176.8° C. Analysis: Calculated for C13H20N2O2 : %C, 66.07; %H, 8.53; %N, 11.85; Found: %C, 65.85; %H, 8.35; %N, 11.68.

Provenance & Evidence