PRODUCTION OF 2-HYDROXY-1,4-NAPHTHOQUINONE

Title:

PRODUCTION OF 2-HYDROXY-1,4-NAPHTHOQUINONE

Document Type and Number:

Japanese Patent JPH1135517

Kind Code:

A

Abstract:

To provide a process for the easy and economical production of 2 -hydroxy-1,4 -naphthoquinone (2HNQ) having high purity from 1,4 -naphthoquinone (NQ) from a solution containing NQ-oxide obtained by the epoxidization of NQ without necessitating the operations such as the separation of NQ-oxide and the drying and pulverization of the product.

The objective compound is produced by oxidizing naphthoquinone dissolved in an inert organic solvent incompatible with water with an aqueous solution of a hypochlorite in the presence of a phase-transfer catalyst to obtain 2,3-epoxy -2,3-dihydro -1,4 -naphthoquinone, reacting the compound with an alkaline compound dissolved in an alcohol and acidifying the resultant 2 -hydroxy-1,4 -naphthoquinone alkali metal salt with a mineral acid.

Inventors:

SONOBE ATSUSHI
TANAKA TETSUYA
SUGANUMA HIROYUKI

Application Number:

JP19859797A

Publication Date:

February 09, 1999

Filing Date:

July 24, 1997

Export Citation:

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Assignee:

KAWASAKI KASEI CHEMICALS

International Classes:

B01J31/02; C07B61/00; C07C46/00; C07C50/32; (IPC1-7): C07C50/32; B01J31/02; C07C46/00

Domestic Patent References:

JPS60118212A

1985-06-25

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