Naphthoquinone

• Alpha -naphthoquinone
• 1,4- Naphthalindion
• Naphthalene- 1 ,4-dione

Brownish green solid with a characteristic odor

Fixed

1.42 g · cm -3

128.5 ° C

0,026 mbar ( 50 ° C)

• Practically insoluble in water (0.09 g · l-1 at 25 ° C)
• Slightly soluble in alcohol
• Soluble in benzene, chloroform, acetic acid and

Risk

190 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

1,4-naphthoquinone is a chemical compound from the group of ketones. It is one of the isomers naphthoquinones, including, for example, 1,2-naphthoquinone and 2,6- naphthoquinone are.

Biological Significance

1,4-naphthoquinone or its derivative, menadione (2 -methyl-1 ,4-naphthoquinone ) is the basic structure of the different vitamin K compounds.

Production and representation

1,4-naphthoquinone can be produced by catalytic gas-phase oxidation of naphthalene. Also describes the preparation by oxidation of 1,4- aminonaphthol, 1,4- diaminonaphthalene or 1-naphthylamine- 4-sulfonic acid is also possible.

Properties

1,4- naphthoquinone is a light-and air-sensitive, brownish -green solid with a characteristic odor. It starts at temperatures lower than 100 ° C to sublime and decompose at elevated temperatures, wherein carbon monoxide and carbon dioxide formed.

Use

1,4-naphthoquinone is used as a hardener for photochemically crosslinkable polyesters and for the production of polyester resins, fungicides, algicides, and anti-oxidants. It is used as an intermediate for the preparation of anthraquinone, anthraquinone derivatives, and vat dyes, as polymerization in the production of synthetic rubber, and polyacrylates, and as a corrosion inhibitor.