| abstract |
The present invention is directed to the preparation of benzimidazole derivatives of the formula (I), ##STR1## wherein A=stands for S, SO or SO 2 , n R 1 =stands for C 1-4 alkyl group, n R 2 =stands for C 1-4 alkyl, C 3-7 cycloalkyl or C 6-10 aryl or aralkyl, n comprising reacting a sulphochloride of the formula (II) ##STR2## with an alkyl aluminum compound of the formula (III). n n R.sub.n.sup.2 AlClhd (3-n) (III) n n The reaction is performed in one step. |