Method for preparation of 4-halogenonaphthalic acid anhydrides

Details Method for preparation of 4-halogenonaphthalic acid anhydrides Method for preparation of 4-halogenonaphthalic acid anhydrides

1985-02-19

1986-04-15

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31178

Patent

active

045829101

ABSTRACT:
A method for the preparation of 4-halogenonaphthalic acid anhydrides by halogenation of an aqueous solution of an alkali salt of the naphthalic acid with halogen or alkali metal hypohalogenite wherein a solution of the alkali metal salt of the naphthalic acid is treated with a water soluble magnesium salt and at least an equal molar amount of an alkakli metal hydroxide, halogenating this reaction mixture at a temperature in the range of 10.degree. to 25.degree. C. and subsequently acidifying the reaction mixture. In a second embodiment of the invention, an aqueous solution of alkali metal carbonate is used in place of the magnesium salt and alkali metal hydroxide.

REFERENCES:
patent: 3888885 (1975-06-01), Deucker et al.
patent: 3954810 (1976-05-01), Deucker et al.
patent: 4033986 (1977-07-01), Castenson et al.
Kamiya et al., Chemical Abstracts, vol. 83 (1975) 114076y.
Wakisaka et al., Chemical Abstracts, vol. 88 (1978) 120868c.

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