C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 9/6574 (2006.01) C07F 9/6571 (2006.01) G03F 7/029 (2006.01)
Patent
CA 2067316
HOE 91/H 009 Cyclic Acylphosphinic acid derivatives and process for their preparation Abstract The invention relates to cyclic acylphosphinic acid derivatives of the formula Image in which the substituents independently of each other can have the following meaning: R1, R2, R3 = H, halogen, C1- to C10-alkyl or -alkoxy, phenyl, phenoxy, acetyl or NO2, where R1 and R2 together, with incorporation of the associated aromatic 6-ring, can also form an extended, unsubstituted or substituted aromatic ring system; R4 = C1- to C4-alkyl, C5- or C6-cycloalkyl, phenyl or alkylphenyl. The novel cyclic acylphosphinic acid derivatives can be prepared by reacting aromatic o-hydroxycarboxylic acids with organyldichlorophosphines of the formula R4PCl2 in an aprotic solvent or suspension medium at 0 to 200°C with elimination of HCl and separating off, washing and drying the precipitated target product.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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