| abstract |
(57) [Summary] [Problem] General formula: Wherein each An is nitrogen or CR n (n = 1-5), provided that at least one of the ring members is nitrogen and the two nitrogen atoms are not directly bonded to each other. R 1 to R 5 , if present, independently of one another, Hydrogen, a C 1-4 alkyl group or an aryl group, and wherein one of the substituents R 1 to R 5 is a group of the formula —OR, wherein R is an optionally substituted aromatic or heterocyclic ring; It is a group of the formula aromatic. ] May be formed. R 6 is hydrogen or a C 1-4 alkyl group, and R 7 is an optionally substituted aromatic or heteroaromatic group. ] Is provided. Compounds of this type, especially those in which one of the substituents R 1 to R 5 is an alkoxy group, are important herbicides. SOLUTION: A corresponding heterocyclic aromatic halide, The corresponding aromatic amine and carbon monoxide are reacted in the presence of a palladium diphosphine complex. |