| 摘要 |
Naphthalic acids, or the corresponding anhydrides, are prepared by oxidation of the corresponding acenaphthenes, which are optionally substituted once or twice on the naphtha linker, with molecular oxygen in an organic solvent and in the presence of a catalyst (1) and an accelerator (2). Heavy metal compounds, optionally mixed with bromine compounds, are suitable as catalysts (1), and anhydrides of lower fatty acids, ketones or aldehydes are suitable as accelerators (2). Preferably, the products, which are oxidised in this manner in a first stage, are subjected to a second oxidation with peroxide, hypohalite or O2, usually in an aqueous alkali metal solution or in a mixture of this solution with an organic solvent. The process permits comparatively mild oxidation conditions and the suppression of side reactions, and provides comparatively high yields. |
