Method for producing tetracarboxylic acids

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Reexamination Certificate

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Reexamination Certificate

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07834211

ABSTRACT:
A process for preparing tetracarboxylic acids of the general formula Ior salts thereof, wherein at least one compound of the general formula II a or II b(a) is first reacted with at least one epoxidation reagent and(b) then oxidized with nitric acid or at least one nitrogen oxide,where the variables are defined as follows:R1, R2are the same or different and are selected from hydrogen, phenyl and C1-C10-alkyl.

REFERENCES:
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patent: 5047582 (1991-09-01), Brotherton et al.
patent: 5157152 (1992-10-01), Brotherton et al.
patent: 30 16 225 (1981-10-01), None
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patent: 0 688 897 (1995-12-01), None
patent: 05-178788 (1993-07-01), None
patent: 6601148 (1966-01-01), None
Franz, John E., “Mechanism of the Nitric Acid Oxidation of Olefins”, J. Org Chem., vol. 30, pp. 1488-1491, 1965.

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