| 摘要 |
Phenoxypropionic acid derivs. of formula (I) are new: (where R are same or different halo, or 1-4C alkyl or alkoxy Y = O or S. n= 1-2. R1 is substd. alkyl, cyclohexyl or cyclohexenyl, or opt. substd. phenyl, naphthyl, alkenyl or alkynyl). Same pref. values of R1 are 1-8C opt. branched alkyl substd. by cyclohexyl, halophenyl or 1-4C alkylphenyl; cyclohexyl substd. by halo or 1-4C alkyl; cyclohexenyl; 3-4C alkenyl substd. by phenyl, OH or halo; phenyl opt. substd. by 1-4C alkyl, CF3, NO2, 1-3C alkoxy etc.; 2-furyl-methyl and its tetrahydro analogue; pyridyl; 2,3-epoxy-propyl; CF3CH2- etc. (I) are well tolerated by cultivated dictoyledons and various cereals. The application rate is 0.1-10, pref. 0.1-3 kg/hectare. In an example 2-chloroethyl 2- 4-(2,4-dichlorophenoxy)-phenoxy propionate was prepd. from 2-chloroethanol and 2- 4-(2,4-dichlorophenoxy)-phenoxy propionyl chloride. |
