| 摘要 |
PURPOSE:To separate the titled 2,6-isomer from a mixture of 2,6-isomer and 2,7-isomer in purified form, by reacting the mixture with m-nitrobenzoic acid in a specific solvent and decomposing precipitated complex. CONSTITUTION:2-Methylnaphthalene is made to react with ethylene in the presence of an anhydrous AlCl3 catalyst to obtain a mixture of methyl- ethylnaphthalenes, from which the titled substance is separated by the following process. The above mixture is made to react with m-nitrobenzoic acid in a solvent which is a good solvent of the methyl-ethylnaphthalene but poor solvent of m-nitrobenzoic acid (e.g. heptane, hexane, pentane, etc.) and the reaction mixture is cooled to precipitate a complex, which is added with water and an extraction solvent (e.g. heptane, benzene, etc.) and decomposed by heating at the boiling point. The solvent is removed from the extracted organic layer containing the objective material and the residue is recrystallized to obtain the objective material in high purity.
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