Process for the preparation of naphthalene-1,4,5,8-tetracarboxyl

Details Process for the preparation of naphthalene-1,4,5,8-tetracarboxyl Process for the preparation of naphthalene-1,4,5,8-tetracarboxyl

1984-07-05

1986-07-08

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562480, 562485, 562486, C07D31180

Patent

active

045994315

ABSTRACT:
Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid (called "NTC" below) and its 1,8-monoanhydride in a high degree of purity, which comprises dissolving impure NTC or impure NTC-1,8-monoanhydride as the tetra-alkali metal salt of NTC in water in known manner, removing any insoluble impurities present, bringing the clarified solution to a pH value of 4-5 below 45.degree. C., separating off the di-alkali metal salt of NTC which thereby crystallizes out and converting the latter into free NTC or into free NTC-1,8-monoanhydride by treatment with a strong acid at 20.degree. to 100.degree. C.

REFERENCES:
patent: 3628976 (1971-12-01), Stocker
patent: 4355175 (1982-10-01), Pusztaszeri
patent: 4501906 (1985-02-01), Spietschka et al.
Chemical Abstracts, vol. 98, No. 20 (1983)--p. 4, Compilation 98:161 239.
Russian Chemical Reviews (Nov. 1965), vol. 34, No. 11, pp. 829-830.

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