The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1979
Filed:
Mar. 16, 1978
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A novel process for the preparation of an N,N'-disubstituted 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 electrolytic 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 process 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.