4 - Angular clamp on 4 - (5 - trifluoromethyl - 2 - pyridyloxy) - phenoxy bracket to - 2 - pentenoate, herbicides, which contain these, and method for combating of weeds with the use of the new compounds

摘要

NEW MATERIAL:4-(5-Trifluoromethyl-2-pyridyloxy)phenoxyalkane derivative of formula I [X is H, Cl; Y is amidino, tetrazolyl, imidazolyl, alkyliminomethyl, thiocarbamoyl which may be substituted with lower alkyl, cyano, formyl, carboxyvinyl, CH2R (R is OH, lower alkoxy, etc.)]. EXAMPLE:alpha-[4-(5-Trifluoromethyl-2-pyridyloxy)phenoxy]propionitrile. USE:Selective heribicide effective to true grass weeds and harmless to broad leaved plant. PROCESS:The compound I is prepared, e.g. by reacting the compound II with the compound III (Hal is halogen) in a solvent such as acetone, in the presence of an alkaline material such as NaOH, etc., at 40-120 C.