Abstract
AbstractTwo new structural classes of herbicide have been discovered which are based on the 1,2,4‐triazolo[1,5‐a]pyrimidine ring system. These compounds are related to the known herbicidal sulfonylureas and imidazolinones and other studies have shown that they have a similar mode of action, involving the inhibition of branched‐chain amino acid biosynthesis, the site of action being the enzyme acetolactate synthase. The design, synthesis and structure‐ activity relationships of these new classes of compounds are described.
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