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 2067462
HOE 91/H 008 Cyclic acylphosphinic acid derivatives and process for their preparation Abstract The invention relates to novel cyclic acylphosphinic acid derivatives of the formula Image in which the substituents independently of each other can have the following meaning: R1, R2, R3, R4 = H, Cl, Br or C1- to C10-alkyl or -alkoxy, but on condition that either Rl and R2 together, or R3 and R4 together, with incorporation of the associated aroma- tic 6-ring, form a naphthalene structure; R5 = C1- to C4-alkyl, C5- or C6-cycloalkyl, phenyl or alkylphenyl. The novel cyclic acylphosphinic acid derivatives can be HOE 91/H 008 prepared by reacting the corresponding aromatic o-hy- droxycarboxylic acids with organyldichlorophosphines of the formula R5PCl2 in an aprotic solvent or suspension medium at 0 to 200°C with elimination of HCl and by separating off and purifying the precipitated target product.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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