C1(N=C=NC2CCCCC2)CCCCC1.[CH2:16]([C:21]1[CH:29]=[CH:28][C:24]([C:25]([OH:27])=[O:26])=[CH:23][CH:22]=1)[CH2:17][CH2:18][CH2:19][CH3:20].[F:30][C:31]1[C:36]([F:37])=[C:35]([C:38]#[N:39])[CH:34]=[CH:33][C:32]=1O.C(O)(=O)C(O)=O>C1(C)C=CC=CC=1>[CH2:16]([C:21]1[CH:22]=[CH:23][C:24]([C:25]([O:27][C:32]2[CH:33]=[CH:34][C:35]([C:38]#[N:39])=[C:36]([F:37])[C:31]=2[F:30])=[O:26])=[CH:28][CH:29]=1)[CH2:17][CH2:18][CH2:19][CH3:20]A mixture of 0.11 mol of dicyclohexylcarbodiimide and 20 ml of toluene is added to a mixture of 0.1 mol of p-pentylbenzoic acid, 0.1 mol of 2,3-difluoro-4-cyanophenol (prepared according to Example 4), 1.5 g of 4-N,N-dimethylaminopyridine and 200 ml of toluene. After the mixture has been stirred at room temperature for 4 hours, 0.4 g of oxalic acid is added and stirring is continued for a further 30 minutes. Customary working up gives 4-(4-pentylbenzoyloxy)-2,3-difluorobenzonitrile, mp. 33° C.
Wird geladen…