[F:1][C:2]1[CH:12]=[CH:11][CH:10]=[C:9]([F:13])[C:3]=1[C:4]([N:6]=[C:7]=[O:8])=[O:5].[CH3:14][Si:15]([CH3:24])([CH3:23])[C:16]1[CH:22]=[CH:21][C:19]([NH2:20])=[CH:18][CH:17]=1.C1N2CCN(CC2)C1>C1(C)C=CC=CC=1>[CH3:14][Si:15]([CH3:24])([CH3:23])[C:16]1[CH:22]=[CH:21][C:19]([NH:20][C:7]([NH:6][C:4](=[O:5])[C:3]2[C:2]([F:1])=[CH:12][CH:11]=[CH:10][C:9]=2[F:13])=[O:8])=[CH:18][CH:17]=1A solution of 6.0 g of 2,6-difluorobenzoylisocyanate in 20 ml of toluene was added dropwise at room temperature to a mixture of 5.4 g of 4-trimethylsilylaniline, 50 ml of toluene and 100 mg of Dabco®. The reaction mixture obtained was subsequently stirred at 60° C. for 3 hours. The reaction mixture was concentrated by evaporation, and the residue was recrystallised from acetone to obtain 1-(4-trimethylsilylphenyl)-3-(2,6-difluorobenzoyl)-urea of the formula ##STR8## as a white powder having a melting point of 187°-189° C.
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