| 摘要 |
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 R1 and R2 together, or R3 and R4 together, with incorporation of the associated aromatic 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 prepared by reacting the corresponding aromatic o-hydroxycarboxylic acids with organyldichlorophosphines of the formula R5PCl2 in an aprotic solvent or suspension medium at 0 DEG to 200 DEG C. with elimination of HCl and by separating off and purifying the precipitated target product.
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