| abstract |
NEW MATERIAL:An oxazolidinedione derivative of formula I (R 1 WR 3 are H, halogen, NO 2 , alkyl, alkoxy, alkenyloxy, alkynyloxy or cyclo-alkylox0y; R 4 and R 5 are H, alkyl, aryl or together form a polymethylene chain). n EXAMPLE: 3-(4'-Chlorophenyl)-5-isopropylidene-1,3-dioxazolidine-2-,4-dione. n USE: A herbicide having high selectivity and strong herbicidal activity against weeds. n PREPARATION: The compound of formula I can be produced by reacting an aryl isocyanate or carbamoyl chloride of formula II (Y is isocyanato or chlorocarbamoyl) with a β, γ-unsaturated-α-hydroxycarboxylic acid ester of formula III and treating the resultant carbamic acid ester of formula IV with a base in an organic solvent. n COPYRIGHT: (C)1987,JPO&Japio |