Process for electrolytic dimerization of n- substituted...

Details Process for electrolytic dimerization of n- substituted... Process for electrolytic dimerization of n- substituted...

C - Chemistry, Metallurgy

25

B

204/53.5

C25B 3/10 (2006.01) C07D 211/70 (2006.01)

Patent

CA 1098860

TITLE OF THE INVENTION PROCESS FOR ELECTROLYTIC DIMERIZATION OF N-SUBSTITUTED PYRIDINIUM SALT ABSTRACT OF THE DISCLOSURE A novel process for the preparation of an N,N'-di- substituted tetrahydro-4,4'-bipyridyl by electrolytic dimerization of the corresponding N-substituted pyridinium salt, characterized in that, using a system including an electrolytic cell having at least one diaphragm and an extractor disposed outside the electrolytic cell, the electro- lytic dimerization is carried out while an aqueous catholyte containing the corresponding N-substituted pyridinium salt is circulated between the electrolytic cell and the extractor in which the product is extracted into an extraction solvent, followed by separation of the aqueous phase which alone is recycled into the electrolytic cell. According to the pro- cess of the present invention, the electrolytic dimerization can be continued stably for a long time, a high current efficiency can be attained and the desired product can be obtained in high yield.

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