PRODUCTION OF 2-METHYL-1,4-NAPHTHOQUINONE - SAKOTA KAGAKU KAIHATSU KENKYUS

Title:

PRODUCTION OF 2-METHYL-1,4-NAPHTHOQUINONE

Document Type and Number:

Japanese Patent JPH0971887

Kind Code:

A

Abstract:

To develop a production method of vitamin K3 (menadione) by electrolytic oxidation in high yield without requiring a complicated process.

1-methoxy-2-methylnaphthalene is electrolyzed in a methylalcohol solvent by using an alkali metal hydroxide and/or alkali metal mothoxide as the supporting electrolyte to produce 1,1,4-trimethoxy-2-methyl-1,4- dihydronaphthalene. The product is refluxed to remove alcohol to obtain 1,4- dimethoxy-2-methylnaphthlene. Then in the same electrolytic cell, the product is electrolyzed in an alcohol solvent by using the same supporting electrolyte to produce 1,1,4,4-tetramethoxy-2-methyl-1,4-dihydronaphthalene, which is then hydrolyzed to obtain 2-methyl-1,4-naphthoquinone.

Inventors:

SAKOTA NAOICHI
TABUCHI KENZO
AMADA IWAO

Application Number:

JP25473195A

Publication Date:

March 18, 1997

Filing Date:

September 05, 1995

Export Citation:

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Assignee:

SAKOTA KAGAKU KAIHATSU KENKYUS

International Classes:

C07C46/02; C07C50/10; C25B3/23; (IPC1-7): C25B3/02; C07C46/02; C07C50/10

Attorney, Agent or Firm:

Hiroshi Ozeki

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