Herbicidal fluorophenoxyphenoxyalkanoic acids and derivatives thereof
申请人:DOWELANCO
公开号:EP0302203A1
公开(公告)日:1989-02-08
Novel 2-(4-(2′-fluoro-4′-cyanophenoxy)phenoxy)alkanoic acids and agriculturally acceptable derivatives thereof are selective postemergent herbicides for the control of grassy weeds in valuable crops. The novel herbicides are surprisingly selective, i.e., exhibit little or no phytotoxic effects, to wheat, barley and especially rice at concentrations that control undesired weed grasses.
[EN] AROMATIC (HETERO)CYCLIC ETHER COMPOUND HAVING INSECTICIDAL ACTIVITY, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF<br/>[FR] COMPOSÉ ÉTHER (HÉTÉRO)CYCLIQUE AROMATIQUE AYANT UNE ACTIVITÉ INSECTICIDE, SON PROCÉDÉ DE PRÉPARATION ET SON APPLICATION<br/>[ZH] 具有杀虫活性的芳(杂)环醚类化合物及其制备方法和用途
PROCESS FOR THE MANUFACTURE OF R-(+)-2-(4-(4-CYANO-2-FLUOROPHENOXY)PHENOXY)PROPIONIC ACID ESTERS
申请人:Leng Ronald B.
公开号:US20110152560A1
公开(公告)日:2011-06-23
Cyhalofop is prepared by coupling 2-(4-hydroxyphenoxy) propionic acid and 3,4-difluorobenzonitrile with base in a polar aprotic solvent in the presence of a phase-transfer catalyst.