| 摘要 |
NEW MATERIAL:A compound expressed by formula I (X and Y are halogen; Z is NO2, NH2 or expressed by formula VI; A is OR<5>, SR<6> or NR<7>R<8>; R<1> and R<3> are H or alkyl; R<2>, R<5>, R<7> and R<8> are H, alkyl, alkenyl or alkynyl, and R<2> is haloalkyl; R<7> and R<8> are alkyl, alkoxyl, etc. substituted by 1-2 alkoxyl groups, etc.; R<4> is H or CH3; R<6> is alkyl). EXAMPLE:2-(2,4-Dichloro-5-nitrophenyl)-5-methyl-1,2,4-triazolin-3-one. USE:A herbicide having high selective herbicidal activity, a wide range of weeding spectrum and high safety for crops. PREPARATION:A compound expressed by formula III (R<9> is OR<11> or NR<12>R<13>; R<10>-R<13> are 1-4C alkyl; R12 and R<13> are further H; W is O or S) is reacted with a compound expressed by formula II Z<1> is NO2) in an inert solvent to give an intermediate expressed by formula IV, which is then subjected to ring closure in the presence of a base to afford the aimed compound expressed by formula Vin formula I .
|
