Abstract
Several derivatives of heterocyclic-oxy phenoxy propionic acid have been known as selective herbicides. During extensive investigations on this series with various condensed heterocyclic moieties, the quinoxalinyloxy phenoxy propionic acid derivatives were found to show an excellent herbicidal activity against grass weeds. Among them, ethyl 2- [4- (6-chloro-2-quinoxalinyloxy) phenoxy] propionate, (code No.NC-302, quizalofop ethyl) showed a potent herbicidal activity. It is commercialized as a novel post-emergence herbicide. In this paper, facile syntheses of substituted quinoxalines and quizalofop ethyl derivatives are described in detail.
