Substituted 2-phenyl pyridines, their manufacture and use as herbicides

Abstract From the Canadian patent

The invention relates to substituted 2-phenyl pyiridines of formula (I) in which the substituents and index m have the following meanings: m is 0 or 1; R1 is halogen, C1-C4 halogen alkase, C1-C4 halogen alkoxy C1-C4-alkylthio, C1-, C4-alkyl sulfinyl C1-C4-alkyl sulfonyl, C1-C4-halogen-alkylthio or cyano; R2 is fluorine or trifluoromethyl; R3 is hydrogen or halogen; R4 is halogen or cyano; R5 is Co2R6, OR7, SR7, C(R8)=N-O-R7 or C(R8)=C(R8)-CO-O-R6 where R6 is , hydrogen, an unsubstituted or halogen-substituted C1-C8-alkyl- C3-C6-alkenyl- , or C3-C6-alkynyl radical; C1-C4-alkoxy-C1-C4-alkyl C1-C6-alkoxycarbonyl-C1-C4-, alkyl, C3-C4-alkyl C3-C4-alkenyl oxycarbonyl-C1-C4-alkyl, …