Process for the electrochemical dihydrogenation of

专利名称：Process for the electrochemical

dihydrogenation of naphthyl ethers

发明人：Detlev Herbert Skaletz申请号：US05/855355申请日：19771128公开号：US04115216A公开日：19780919

摘要：Naphthyl ethers having at least one ether group may be dihydrogenated in anelectrochemical manner by electrolysis of the naphthyl ethers in a solvent consistingessentially of an alkanol having from 1 to 3 carbon atoms, optionally in admixture with asmall amount of a cosolvent and containing no more than about 5% by volume of waterin the presence of at least one supporting electrolyte selected from the groupconsisting of tetramethylammonium salt

TETRAETHYLAMMONIUM SALT

TETRAMETHYLAMMONIUM HYDROXIDE

TETRAETHYLAMMONIUM HYDROXIDE

TETRAMETHYLPHOSPHONIUM SALT

TETRAETHYLPHOSPHONIUM SALT

TETRAMETHYLPHOSPHONIUM HYDROXIDE AND

< P> TETRAETHYLPHOSPHONIUM HYDROXIDE

IN A CONTINUOUS FLOW CELL WITH SEPARATION OF THE CATHODE AND ANODE

ZONES, WITH THE USE OF A SOLID CATHODE HAVING A MORE CATHODIC HYDROGENOVERVOLTAGE THAN THAT OF Cu and a usual solid anode, at temperatures of from -20°to +120. degree. C, and at a pH of more than about 8, according to the galvanostaticoperation mode.

The dihydrogenation of naphthyl-ethers having the ether group in 2-position ispreferred since . beta.-tetralones are obtained via the 1,4-, 3,4- and 1,2-dihydroproductsand hydrolysis thereof; tetralones being important starting substances for the synthesisof pharmacologically interesting compounds. The process can be carried out on anindustrial scale with high current density and high space-time yields as well as relative lowspecific energy consumption.

申请人：HOECHST AKTIENGESELLSCHAFT

代理机构：Curtis, Morris & Safford

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