| 摘要 |
NEW MATERIAL:An oxazolidinedione derivative of formula I (R<1>-R<3> are H, halogen, NO2, alkyl, alkoxy, alkenyloxy, alkynyloxy or cyclo-alkylox0y; R<4> and R<5> are H, alkyl, aryl or together form a polymethylene chain). EXAMPLE:3-(4'-Chlorophenyl)-5-isopropylidene-1,3-dioxazolidine-2-,4-di one. USE:A herbicide having high selectivity and strong herbicidal activity against weeds. 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 beta, gamma-unsaturated-alpha-hydroxycarboxylic acid ester of formula III and treating the resultant carbamic acid ester of formula IV with a base in an organic solvent.
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