R OPTICAL ISOMER OF PHOSPHONIC ACID DERIVATIVE OR PHOSPHINIC ACID DERIVATIVE AND HERBICIDE COMPRISING THE SAME ISOMER AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound shown by formula I (X and Y are H, CF3, lower alkyl and X and Y are not H at the same time; Z is =CH- or =N-; R1 is lower alkyl; R2 and R3 are H or lower alkyl; (n) is 0 or 1; * is asymmetric carbon atom). EXAMPLE:A compound shown by formula II. USE:A herbicide having excellent selectivity. PREPARATION:A compound shown by formula III is made to react with a compound shown by formula IV (W is halogen or formula V) in the presence of K2CO3.