... Institute of Chemical Technology. ... A solution of 17 g (0'1 mol) 4-chlorophenylurea in 150 ml toluene was treated with 17'6 g (0·1 mol) 2,6-difluorobenzoyl chloride, and the mixture was refluxed 7 h. After cooling, the precipitated solid was collected and washed with ether. ... Collect. ...