2-Phenoxypropionic acid(4) was prepared by the reaction from 2-chloropropanoic acid. Ten novel 2-(1-phenoxyethyl)-4H-benz[d][1,3]oxazin-4-ones(6a~6l) were synthesized via the reaction of acylation and cyclization from 4. The structures were characterized by ~1H NMR and MS(EI). The herbicidal activities of 6a~6l were tested by the culture dish method. The results showed that 6a, 6j and 6k possessed a promising selective inhibition against the growth of oilseed rape root at concentration of 1 mg·L~(-1), w...
