Trade names for products containing imazethapyr include Contour, Hammer, Overtop, Passport, Pivot, Pursuit, Pursuit Plus, and Resolve (205, 223, 207)

Name and Structure　
common name :imazethapyr
chemical name : ( RS )-5-ethyl-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid

structure: 

molecular formula : C₁₅H₁₉N₃O
molecular weight : 289.3

CAS NO.: 81335-77-5
Physical and chemical  Properties .

Technical imazethapyr is a gray to yellowish crystal solid with a slightly pungent odor. The formulated product is a clear dark brown liquid with a musty odor. The formulated product is corrosive to zinc, mild steel, brass, copper, and aluminum .

Specification: 

 

 

Toxicity

Technical: The acute oral LD50 for technical imazethapyr was reported to be >5000 mg/kg for rats. The acute inhalation LC50 for rats exposed to imazethapyr is 3.27 mg/L. The dermal LD50 for rabbits exposed to technical imazethapyr was >2000 mg/kg. It was found to be slightly irritating to the rabbit eye, with complete recovery in 7 days. The technical material was found to be slightly irritating to the skin of male rabbits.

Application

Imazethapyr is an imidazole compound used as a selective herbicide. It is applied preplant incorporated, preemergence, at cracking and postemergence. The compound controls weeds by reducing the levels of three branched-chain aliphatic amino acids, isoleucine, leucine and valine, through the inhibition of aceto-hydroxyacid synthase, an enzyme common to the biosynthetic pathway for these amino acids. This inhibition causes a disruption in protein synthesis which, in turn, leads to an interference in dna synthesis and cell growth.

Formulation

Imazethapyr: 98%TC

Imazethapyr :5%SL, 10%SL, 70%SP, 70%WP, 70%WDG