PREPARATION OF BIPHENYLSULFONYLUREA DERIVATIVE, INTERMEDIATE THEREFOR AND PREPARATION OF SAID INTERMEDIATE

摘要

PURPOSE:To obtain the titled compound useful as a herbicide in high purity and yield, by reacting a biphenylsulfonylcarbamate derivative with a triazine or pyrimidine derivative. CONSTITUTION:A novel biphenylsulfonylcarbamate derivative of formula I (R is lower alkyl or aryl) is reacted with a compound of formula II (R<1> and R<2> are lower alkyl or lower alkoxyl; Y is CH or N) in an inert organic solvent at 0- 100 deg.C to give the aimed substance of formula III. The reaction can be carried out in the presence of an acid binder, e.g. alkali metal hydroxide or triethylamine. The compound of formula I is obtained by reacting a 2-phenylbenzenesulfonamide of formula IV with a compound of formula V (R' is chlorine atom or group of -O-R).