PURPOSE: To obtain a new phenylpyruvic acid amide derivative useful as an active ingredient of herbicides, capable of exhibiting excellent herbicidal effects in a small amount of chemical, having high safety and excellent in selectivity between the weeds and crops.
CONSTITUTION: A compound, e.g. N-(α,α-dimethylbenzyl)-3-methyl-2-oxo-3- phenylbutanamide expressed by formula I [X is H, halogen, alkyl, alkoxy or NO2; R1 is H, alkyl, alkenyl or alkynyl; R2 is R1 except H or R1 and R2 integrally form alkylidene or (CH2)1 (1 is 2-5); A is carbonyl or CHZ (Z is halogen, OH or alkoxy); R3 and R4 are H or alkyl; Y is H, halogen, alkyl, alkoxy, etc.; m and n are 1-5]. The aforementioned compound is obtained by reacting a phenylpyruvic acid derivative expressed by formula II (Q is halogen, OH or alkoxy) with an amine expressed by formula III, preferably in the presence of a base in a solvent.
NAKAMURA KAZUMI
KAWAMURA YASUO
NAWAMAKI TSUTOMU
WATANABE SHIGEOMI
