PROCESS FOR THE PREPARATION OF 4-BROMOMETHYL-[1,1'-BIPHENYL]-2'-CARBONITRILE

Process for the preparation of the compounds of the general formula (I) - where in the formula R represents cyano group, - COOR1 or -CONR2R3 group - where R1, R2 and R3 stand for identical or non-identical substituents chosen from the following atom or groups: hydrogen atom, straight or branched C1-7 alkyl group, C3-6 cycloalkyl group; or in one given case a tetrazolyl group substituted with a C1-4 alkyl group or triphenylmethyl group - wherein a compound of the general formula (II) - where the meaning of R is as defined above - is reacted with one of the following reagent pairs as bromine sources: bromate with hydrogen sulfite, or bromate with pyrosulfite, or bromide with percarbonate, or bromide with perborate, in aqueous-organic binary systems, and optionally the resulting compound of the general formula (I) is isolated from the reaction mixture by a method known per se.