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 relates to the technical field of herbicide crystallization process, particularly to Crystalline form C of shuangzuocaotong, and a preparation method therefor and use thereof. The Crystalline form C of shuangzuocaotong has an X-ray powder diffraction pattern having characteristic absorption peaks at the following 2? positions: 10.159, 10.658, 13.318, 14.579, 16.096, 18.061, 19.322, 19.68, 20.04, 20.659, 21.281, 23, 24.16, 24.619, 26.101, 26.74, 30.359, 31.018, 32.378, 35.398 and 38.26 degrees, wherein 2? has an error range within ±0.2°. The Crystalline form C of shuangzuocaotong has good stability, and its compounded composition with additional active ingredient(s) has a good control effect to broadleaf weeds and some gramineous weeds in wheat, significantly better than that of Crystalline form A of shuangzuocaotong.

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 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.