Imazethapyr
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Imazethapyr

Overview: Imazethapyr is an organic heterocyclic herbicide belonging to the imidazolinone class. Also known as PURSUIT，Imazethapy，imidazometidine, its isopropylamine salt is suitable for controlling all weeds. It has excellent herbicidal activity against sedges, annual and perennial monocotyledonous weeds, broadleaf weeds, and miscellaneous trees. It can be applied pre-emergence or post-emergence. It is rapidly absorbed by plant roots and leaves, inhibiting the biosynthesis of plant side-chain amino acids (valine, leucine, isoleucine), destroying proteins, thus inhibiting weed growth and promoting death. Sensitive weeds stop growing immediately after foliar treatment and generally die after 2-4 weeks. Selectivity is due to the different metabolic rates of plants; resistant plants metabolize it faster than sensitive plants.
The synthesis and screening of imidazolinone compounds began in 1975. In 1982, M. Los et al. first reported this type of herbicide. In 1983, P.L. Orwick et al. reported imazapyr and its isopropylammonium salt, while D. L. Shaner et al. reported imazaquin and its ammonium salt, imazaqin-ammonium. This made imidazolinone compounds an active area for developing new herbicide varieties. Subsequently, D. L. Shaner and N.E. Shafer reported the herbicidal activity of imazamethabez-methyl[3], and T. Malefyt et al. reported the herbicidal activity of imazethapyr and its ammonium salt. Color and appearance: White to off-white powder
Specifications: 99% min.
CAS NO.: 81335-77-5
Molecular formula: C32H24O3S
Molecular weight: 488.6

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Product Introduction

Item	Index
Imazethapyr mass fraction/%	≥97.0%
Loss on drying/%	≤0.5%
Mass fraction of insoluble sodium hydroxide/%	≤0.3%
pH Range	2.5-4.5
During normal production, the insoluble matter of sodium hydroxide should be measured at least once every three months.

Uses

5-Ethyl-2-(4-isopropyl-4-methyl-5-oxo-1H-imidazolin-2-yl)nicotinic acid selective pre- and post-emergence herbicides, inhibitors of branched-chain amino acid synthesis. Absorbed through roots and leaves, and translocated within the xylem and phloem, it accumulates in plant meristems, affecting the biosynthesis of valine, leucine, and isoleucine, damaging proteins, and ultimately causing plant death. Applications include pre-sowing soil incorporation, pre-emergence surface treatment, and early post-emergence application. It controls many grasses and broadleaf weeds. Soybeans are tolerant, and the general application rate is 140–280 g/hm², although some reports indicate a soil treatment rate of 75–100 g/hm² for soybean fields. It also shows selectivity for other legume crops, with a application rate of 36–140 g/hm². A dosage of 36–142 g/hm², whether applied by soil mixing or early post-emergence application, is effective in controlling dichroic sorghum, sedge, amaranth, and datura. A dosage of 100–125 g/hm², applied by soil mixing before sowing or pre-emergence treatment, provides excellent control of barnyard grass, millet, green foxtail, velvetleaf, retroflexus, and lambsquarters. For post-emergence treatment to control annual grasses and broadleaf weeds, a dosage of 200–250 g/hm² is required.

application