| 摘要 |
Title compds.[I; R = halogen, CF3, NO2, CH, C1-4 alkyl, C1-4 alkoxy, C1-4 alkyl thio; A= O, S, NH, N-C1-4 alkyl; R1 = H, C1-4 alkyl; Z = -C(O)OR2, C(S)NH2, CN, n = 0,1,2; R2 = H, C1-12 alkyl, C5-6 cyclo alkyl, C3-6 alkenyl, halo- C3-6 alkenyl; R4,R5 = H, C1-6 alkyl, hydroxy-C1-6 alkyl, C5-6 cyclo alkyl, substituted phenyl, having herbicidal property, were prepd. by reacting compd(II) with compd.(III). Thus, the mixt. of 2-(4'-hydroxyphenoxy)-propionic ethyl ester 42g; CaCO3 33.1 g and acetonitrile 300 ml was refluxed for 90 min. 2-Chloro benzimidazole 33.9 g was added, refluxed for 30 hr, filtered and acetonitrile was removed to give 60.7 g I.
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