| abstract |
NEW MATERIAL:A compound shown by formula I [R 1 is H or (phenyl) lower alkyl; R 2 is OH, lower alkyl, lower alkylthio or N(R 4 )R 5 (R 4 and R 5 are H, lower alkyl or 2,6-diethylphenyl); R 3 is pyridyl, thienyl, furyl or trifluoromethyl]. n EXAMPLE: 2-(3-Pyridyl)-5-phenyl-pyrrole-3,4-dicarboxylic acid dimethyl ester. n USE: A herbicide. n PREPARATION: An acetylenedicarboxylic acid ester derivative shown by formula II is reacted with an N-Acylphenylglycine derivative shown by formula III in an organic solvent such as preferably acetic anhydride at ≥100°C. n COPYRIGHT: (C)1992,JPO&Japio |