Description
Clopyralid tripromine is a selective herbicide used to control weeds in turf. It is moderately persistent in the environment and, based on its physico-chemical properties, it has high potential to leach to groundwater. Clopyralid tripromine tends to be low to moderately toxic to fauna and flora. It has a low mammalian toxicity as a skin, eye and respiratory irritant.
Production Methods
Clopyralid-tripromine is produced through an industrial process that parallels other amine-salt formulations of pyridine-carboxylate herbicides, with the distinctive step being the formation of a stable salt between clopyralid acid and the tertiary amine tripromine. Manufacturers first generate high-purity clopyralid acid via controlled chlorination and oxidation of a substituted pyridine precursor, followed by purification to remove regioisomers, over-chlorinated materials, and residual reagents. The purified acid is then reacted with tripromine under carefully managed pH and temperature conditions to ensure complete salt formation without leaving unreacted acid or excess amine. Once neutralisation is complete, downstream operations focus on concentrating the mixture, removing solvents, and crystallising or drying the salt to meet agrochemical specifications.
Mechanism of action
Selective, systemic, absorbed through leaves and roots. Synthetic auxin.
