Abstract: Disclosed are a pyrazole compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. The pyrazole compound or a salt thereof has a structure as shown in formula (I): wherein, R represents wherein, R?, R?, and R?? represent hydrogen, C1-C4 alkyl, C1-C4 halogenated alkyl, C1-C4 alkoxy or halogen, R?, R?, and R?? may be the same or different; R1 represents C1-C3 alkyl; R2 represents hydrogen or C1-C4 alkyl; R3 represents hydrogen or C1-C6 alkyl, optionally substituted phenyl, optionally substituted pyridyl, optionally substituted alkenyl, optionally substituted alkynyl, C1-C6 alkyl carbonyl, C1-C6 alkoxyl carbonyl, C1-C6 alkyl carbonyl methyl, etc. A compound having a pyrazole structure not only has excellent herbicidal effect on barnyard grass, but also is safe to rice in post-emergence application. More surprisingly, it also has good control efficacy on barnyard grass resistant to major herbicides, such as penoxsulam, quinclorac, cyhalofop-butyl, propanil, etc.

Abstract: The invention belongs to the technical field of agricultural chemicals, and in particular relates to a pyridazinol compound represented by the Formula I, a derivative, preparation method, herbicidal composition and use thereof.

Abstract: The present invention belongs to the field of pesticides, particularly relates to a pyrazolone compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. The pyrazolone compound is as described in formula I: In the formula, R1R2N represents substituted or unsubstituted 3-8 membered nitrogen-containing heterocyclic group containing 1-3 heteroatoms; or R1 and R2 each represent hydrogen or C1-8 alkyl; R3 represents hydrogen, C1-4 alkyl, alkenyl, alkynyl, unsubstituted C3-6 cycloalkyl or C3-6 cycloalkyl substituted by C1-4 alkyl; R4 represents methyl, ethyl, n-propyl, isopropyl or cyclopropyl; X represents hydrogen, —S(O)nR6, —R7 or substituted or unsubstituted 3-8 membered heterocyclic group containing 1-4 heteroatoms, wherein, n represents 1, 2 or 3, R6 represents substituted or unsubstituted alkyl or aryl, and R7 represents substituted or unsubstituted alkyl, aryl, alkyl acyl or aroyl.

Abstract: The invention belongs to the technical field of agricultural chemicals, and in particular relates to a five-membered ring-substituted pyridazinol compound and a derivatives thereof, preparation method, herbicidal composition and application thereof. The compound is as shown in Formula I: wherein, X is halogen, cyano, alkyl, halogenated alkyl, alkoxy, halogenated alkoxy, R1R2N—(C?O)—, or R1R2N—, etc.; Ar is Het is a 5-membered unsaturated ring, the ring contains, besides the 1-C atom, 0 to 4 atoms or radicals follows to form the ring: O, NRb, S; Ra is one or more groups selected from: hydrogen, halogen, R—O—(CH2)n—, and R1R2R3SiO—, etc.; m is 0 or 1, n and q are independently an integer from 0 to 8, p is an integer from 1 to 8; R is hydrogen, or a halogen-containing or not containing group selected from alkyl, and alkenyl, etc.; Rb, R1, R2, R3 are each independently hydrogen, nitro, hydroxy, or amino, etc.

Abstract: The invention belongs to the technical field of agricultural chemicals, and in particular relates to a pyridine ring-substituted pyridazinol compound and a derivatives thereof, preparation method, herbicidal composition and application thereof. The compound is as shown in Formula I: wherein, X is halogen, cyano, alkyl, halogenated alkyl, alkoxy, halogenated alkoxy, R1R2N—(C?O)—, R1R2N—, hydroxy, or unsubstituted or substituted aryl; Y is independently selected from hydrogen, halogen, cyano, nitro, R—O—(CH2)n—, and R1R2 R3SiO—, etc.; r is an integer from 0 to 4, m is 0 or 1, n and q are independently an integer from 0 to 8, p is an integer from 1 to 8; R is hydrogen, or a halogen-containing or not containing group selected from alkyl, alkenyl, alkynyl, and cycloalkyl, etc.; R1, R2, R3 are each independently hydrogen, nitro, or hydroxy, etc. The compound and the derivative, as well as the composition thereof have very high herbicidal activity and good selectivity, and are safe for crops.

Abstract: The present invention relates to the technical field of pesticides, particularly relates to a pyrazole compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. A pyrazole compound of formula (I) or a salt thereof: wherein, R1 represents hydrogen or C1-C4 alkyl; R2 represents C1-C3 alkyl; R3 represents C1-C6 linear chain or cyclic group containing one or more heteroatoms selected from O, S, and N; R4 represents C1-C3 alkyl or halogen; R5 represents pyrazole ring or pyrazole ring substituted with one or more groups selected from alkyl, alkoxyl, halogen, halogenated alkyl, amino, and nitro. The pyrazole compound is an excellent herbicide with broad spectrum biological activity and outstanding safety for crops.

Abstract: The present invention relates to the technical field of pesticides, particularly relates to a pyrazole compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. A pyrazole compound of formula (I) or a salt thereof: wherein, R1 represents hydrogen or C1-C4 alkyl; R2 represents C1-C3 alkyl; R3 represents C1-C6 linear chain or cyclic group containing one or more heteroatoms selected from O, S, and N; R4 represents C1-C3 alkyl or halogen; R5 represents pyrazole ring or pyrazole ring substituted with one or more groups selected from alkyl, alkoxyl, halogen, halogenated alkyl, amino, and nitro. The pyrazole compound is an excellent herbicide with broad spectrum biological activity and outstanding safety for crops.

Abstract: Disclosed are a pyrazole compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. The pyrazole compound or a salt thereof has a structure as shown in formula (I): wherein, R represents wherein, R?, R?, and R?? represent hydrogen, C1-C4 alkyl, C1-C4 halogenated alkyl, C1-C4 alkoxy or halogen, R?, R?, and R?? may be the same or different; R1 represents C1-C3 alkyl; R2 represents hydrogen or C1-C4 alkyl; R3 represents hydrogen or C1-C6 alkyl, optionally substituted phenyl, optionally substituted pyridyl, optionally substituted alkenyl, optionally substituted alkynyl, C1-C6 alkyl carbonyl, C1-C6 alkoxyl carbonyl, C1-C6 alkyl carbonyl methyl, etc. A compound having a pyrazole structure not only has excellent herbicidal effect on barnyard grass, but also is safe to rice in post-emergence application. More surprisingly, it also has good control efficacy on barnyard grass resistant to major herbicides, such as penoxsulam, quinclorac, cyhalofop-butyl, propanil, etc.

Abstract: The present invention belongs to the field of pesticides, particularly relates to a pyrazolone compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. The pyrazolone compound is as described in formula I: In the formula, R1R2N represents substituted or unsubstituted 3-8 membered nitrogen-containing heterocyclic group containing 1-3 heteroatoms; or R1 and R2 each represent hydrogen or C1-8 alkyl; R3 represents hydrogen, C1-4 alkyl, alkenyl, alkynyl, unsubstituted C3-6 cycloalkyl or C3-6 cycloalkyl substituted by C1-4 alkyl; R4 represents methyl, ethyl, n-propyl, isopropyl or cyclopropyl; X represents hydrogen, —S(O)nR6, —R7 or substituted or unsubstituted 3-8 membered heterocyclic group containing 1-4 heteroatoms, wherein, n represents 1, 2 or 3, R6 represents substituted or unsubstituted alkyl or aryl, and R7 represents substituted or unsubstituted alkyl, aryl, alkyl acyl or aroyl.