| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R1 is alkyl, alkenyl, alkynyl or halogen; n is integer 0-3; R2 is H, alkyl, alkenyl, alkynyl, alkoxyalkyl, alkylthioalkyl, cyanoalkyl, alkylsulfonyl, phenylsulfonyl, etc.; X and Y are halogen). EXAMPLE:1-( 2-Fluoro-4-chloro-5-methylsulfonyloxyphenyl )-3,4,5-trimethylpyrazo le. USE:A herbicide capable of extending the applicability by using the above- mentioned compound with the known herbicides, insecticides or plant growth regulators, etc. PREPARATION:For example, a substituted phenylhydrazine compound expressed by formula II (R2 is a group other than H) is reacted and cyclized with a dicarbonyl compound expressed by formula III (R1 is group other than halogen), e.g. 3-methylpentane-2,4-dione, to afford the corresponding compound expressed by formula I. |
