| 摘要 |
The present invention relates to a process for preparing of phosphorus-containing dicarboxylic acids of the formula (I) <IMG> ( I ) where R1 and R2 are identical or different and are each a straight-chain or branched alkyl radical having from 1 to 8 carbon atoms, a cycloaliphatic radical having 5 or 6 carbon atoms in the ring, an unsubstituted or substituted aryl radical having from 6 to 10 carbon atoms, or R1 and R2 form, with inclusion of the phosphorus atom, a ring having from 5 to 8 members, and m and n are each, independently of one another 0 or 1, by reacting a compound of the formula (II) <IMG> ( II ), where R1, R2 and m are as defined above, with fumaric acid, maleic acid or itaconic acid in the presence of a saturated aliphatic monocarboxylic acid having a total of from 1 to 5 carbon atoms as solvent at from 100 to 200.degree.C under atmospheric pressure or superatmospheric pressure.
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