C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 9/53 (2006.01) C07F 9/32 (2006.01) C07F 9/6571 (2006.01) C07F 9/6574 (2006.01)
Patent
CA 2141258
Abstract of the disclosure Process for preparing phosphorus-containing dicarboxyllc acids and alkyl esters thereof The invention relates to a process for preparing phos- phorus-containing compounds of the formula I Image (I) in which R1 and R3 are identical or different and are a straight-chain or branched alkyl radical having 1 to 8 carbon atoms, a cyclohexyl radical, a cyclopentyl radi- cal, an aryl radical or a halogen-, alkyl- or alkoxy- substituted aryl radical, where Rl and R2 together with the phosphorus atom can also form a ring, in particular an oxaphosphorine ring, n and m . 0 or 1 and R3 and R4 are alkyl radicals having 1 to 4 carbon atoms or n . 0, m = 0 or 1 and R3 and R4 are H, by adding compounds of the formula II Image (II) in which R1 and R2 and n have the moaning given abovo, into dialkyl estere of fumaric acid or of maleic acid of the formula (III) or dialkyl esters of itaconic acid of the formula (IV) Image (III) Image (IV) in which R3 and R4 have the meaning given above, and, if required, reacting an alkyl ester of a phosphorus-con- taining dicarboxylic acid of the formula (I), where n = 0, with water in the presence of catalytic amounts of an acid to give the phosphorus-containing dicarboxylic acid.
Freudenberger Volker
Klein Peter
Kleiner Hans-Jerg
Clariant Gmbh
Fetherstonhaugh & Co.
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