1,1-dimethyl-3-phenylurea

Conditions: temp:205.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3.35 g (0.038 mol) of N,N-dimethylurea and 2.33 g (0.025 mol) of aniline were added with stirring into 28 ml of 1,2,4-trichlorobenzene. The reaction mixture was slowly heated to 205° C., dimethylamine being passed in from 60° C. After 5.5 hours, 11.8 g (0.27 mol) of dimethylamine had been passed in and the reaction was complete. The reaction mixture was cooled to room temperature, whereupon a precipitate deposited. The precipitate was filtered off, washed with 1,2,4-trichlorobenzene, dried and then boiled in water. The aqueous mixture was cooled, and the precipitate was filtered off with suction and dried. 3.3 g of N-phenyl-N',N'-dimethylurea, i.e. 81% of theory, having a melting point of 130° to 133° C. were obtained in this way. passed in from 60° C The reaction mixture was cooled to room temperature, whereupon a precipitate The precipitate was filtered off washed with 1,2,4-trichlorobenzene dried The aqueous mixture was cooled the precipitate was filtered off with suction dried were obtained in this way

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

Procedure: Phenylurea or 1,3-diphenylurea; 83(22):180415j.

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

Procedure: Phenylurea or 1,3-diphenylurea; 83(22):180415j.

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1/2-liter autoclave was charged with nitrobenzene (30.0 g.), dimethylammonium sulphide (40 g.) benzene (60 g.) and carbon monoxide to a pressure of 50 atmospheres. The temperature of the autoclave was raised to 110° C and its contents were maintained at this temperature with stirring for 21/2 hours. The pressure was renewed to 50 atmospheres at intervals as required by passing in more carbon monoxide. The contents of the autoclave were then allowed to cool below 70° C before being removed and distilled to separate the volatiles, which included unreacted nitrobenzene. The residue, weighing 16 g., was recrystallised from a mixture of benzene and 60-80 petroleum ether to give 1,1-dimethyl-3-phenylurea (12.3 g.). its contents were maintained at this temperature to cool below 70° C before being removed distilled to separate the volatiles, which , was recrystallised from a mixture of benzene and 60-80 petroleum ether