| abstract |
A process is described for the preparation of arylamides of heteroaromatic carboxylic acids of the formula: (see formula I) in which each A n is nitrogen or C-R n (n = 1-5), with the proviso that at least one of the ring members is nitrogen and that two nitrogen atoms are not bonded directly to one another; R1 to R5, if present, independently of one another are each hydrogen, C1-4-alkyl or aryl, one of the substituents R1 to R5 being a group of the formula -OR, in which R is an optionally substituted aromatic or heteroaromatic radical; R6 is hydrogen or C1-4-alkyl: and R7 is an optionally substituted aromatic or heteroaromatic radical. The amides are obtained from the corresponding heteroaromatic halogen compounds, the corresponding aromatic amines and carbon monoxide in the presence of a palladium diphosphine complex. Compounds of this class are important herbicides. |