| abstract |
NEW MATERIAL:A compound expressed by formula I (X and Y are 0 or S; A is CH 2 , CH 2 -CH 2 or expressed by formula II; R is di-substituted phenyl, naphthyl, toluyl, trifluoromethylphenyl, etc., provided that R is other than p- chlorophenyl when X and U are O and A is CH 2 ). n EXAMPLE: N-(2,4-Dichlorophenoxy)acetyl-L-glutamic acid. n USE: A safe auxin hormone type herbicide having high selectivity for monocotyledonous and broad-leave plants without phytotoxicity to crops, e.g. rice plant, wheat, barley, etc., while keeping characteristics of phenoxy based herbicides. n PREPARATION: Glutamic acid expressed by formula III is reacted with an acid halide, active ester compound or acid anhydride expressed by the formula R-Y- A-CO-R 1 (R 1 is halogen or active ester) in the presence or absence of a base, e.g. alkali hydroxide, in water or an organic solvent at room temperature or below to afford the aimed compound expressed by formula I. n COPYRIGHT: (C)1986,JPO&Japio |