無水マレイン酸とのDiels-Alder反応を利用するアントラセン迅速定量法

概要

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Various methods have been used for the quantitative determination of anthracene by using its Diels-Alder reaction with maleic anhydride. A new modified method of the determination which is more rapid than previous method is studied. The method is based on that the reaction can be carried out within 10 minutes by using o-dichlorobenzene as the solvent. 0.5g of the sample and 0.5g of maleic anhydride are dissolved in 10ml of o-dichlorobenzene and boiled gently for 10 minutes. After the solution is cooled to room temperature, 100ml of distilled water is added. The aqueous phase is titrated with 0.25N sodium hydroxide solution using a mixed indicator consisting of cresol red and thymol blue. The determination can be carried out in 30 minutes. Comparing the experimental results of this method with those by the ultraviolet spectrophotometric method proposed previously by the authors, it is concluded that this method is applicable to the determination of anthracene in anthracene cake with the accuracy of 1∿2% error.
山梨大学の論文