| abstract |
Process for the preparation of bis (4-amino-1-pyridinium) alkanes of the formula I (I) in which A and A are selected from the group consisting of chlorine, bromine, iodine, methanesulfonyloxy, ethanesulfonyloxy, benzenesulfonyloxy or p -toluenesulfonyloxy, reacting difunctionalized alkanes of the general formula II AYA¿ (II) in which Y is a linear or branched alkylene group having 4 to 18 carbon atoms, and A and A¿ are identical or different and are such as defined above, with 4-aminopyridines of the general formula III (III) in which R is linear or branched and is an alkyl, cycloalkyl or alkylaryl group having 5 to 18 carbon atoms, in a reaction medium, characterized in that the reaction medium is water or a mixture of water and an organic solvent comprising at least 10% by weight of water. |