METHOD OF SYNTHESIS OF SUBSTITUTED 2,3,5,8-TETRAHYDROXY-1,4-NAPHTHOQIONONES Russian patent published in 1994 - IPC

Abstract RU 2022959 C1

FIELD: organic chemistry. SUBSTANCE: product: 2,3,5,8-tetrahydroxy-1,4-naphthoquinones of the general formula where R¹ - hydrogen, hydroxy, R² - aliphatic C₁- C₁₅-alkyl, hydroxy-group, CH₂C₆H₅,, (CH₂)_nCOOH where n = 2-7, (CH₂)_nBr where n = 2-5, hydroxy or R¹ and R² = -CH= CH-CH= CH-. Reagent 1: 2,3-dichloro-5,8-dihydroxy-1,4-naphthoquinones. Reagent 2: aliphatic alcohol. Reaction conditions: fluoride of alkaline metal, aluminium oxide, aluminium chloride, nitrobenzene, monoether of ethylene glycol, dry nitrogen, temperature of solvent boiling. Synthesized compounds are used as antioxidants, dyes. EFFECT: improved method of synthesis.

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RU 2 022 959 C1

Authors

Anufriev V.F.

Novikov V.L.

Dates

1994-11-15—Published

1990-08-27—Filed