NEW MATERIAL:A compound shown by formula I (R1 is substituted in ortho- or meta-position and H, halogen, lower haloalkyl, lower alkoxy, etc.; R2 and R3 are H, halogen, lower alkyl, lower alkoxy, etc.; R4 is lower alkoxy; a case wherein R1 to R3 are H and R4 is ethoxy).
EXAMPLE: 2-Phenyl-4-(3-trifluoromethylphenyl)-5-ethoxycarbonylp-yr-imidine.
USE: A herbicide having excellent herbicidal effects on gramineous weeds, cyperaceous weeds, broad-leaved weeds, etc., and showing excellent selectivity between crops, weeds, etc.
PREPARATION: A compound shown by formula II is reacted with a compound shown by formula III in a solvent such as ethanol at 20-100°C for 0.5-5 hours to give a compound shown by formula I. The amount of the compound shown by formula III used is 1.0-1.2 equivalent based on 1 equivalent of the compound shown by formula II.
KAWAMURA SHINICHI
SANEMITSU MINORU
YAMAMOTO MASAKO
SAKAKI MASAHARU
