2-甲萘醌的合成研究

Synthesis of 2-Methylnaphthalene-1,4-dione

工业上多采用硫酸/铬酐(或重铬酸钠)氧化2-甲基萘合成2-甲萘醌,但此法会产生大量的含铬废水,对环境污染严重。研究了以硝酸钴为催化剂、Oxone为氧化剂催化氧化2-甲基萘合成2-甲萘醌的新方法。研究表明,当以5 mol%硝酸钴为催化剂、Oxone为氧化剂、乙腈/水为溶剂,在反应温度为25℃、反应时间为16 h时,2-甲基萘的转化率和2-甲萘醌的产率分别为82.6%和51.2%。该反应可在室温下进行,反应平稳、绿色、环保、节能、高效。

The industrial process for the preparation of 2-methylnaphthalene-1,4-dione is from 2-methylnaphthalene oxidized by sulfuric acid/chromic anhydride（or sodium dichromate）.But the method generates a large amount of chromium-containing waste water,which seriously pollutes the environment.In this work,a new method of synthesis of 2-methylnaphthalene-1,4-dione from 2-methylnaphthalene using cobalt（Ⅱ） nitrate as catalyst and oxone as oxidant was investigated.The results showed,under the optimized reaction conditions,5 mol% of cobalt（Ⅱ） nitrate catalyst,oxone oxidant,CH_3CN/H_2O solvent,25 ℃ reaction temperature,and 16 h reaction time,the conversion of 2-methylnaphthalene and the yield of 2-methylnaphthalene-1,4-dione could reached 82.6% and 51.2%,respectively.The reaction could proceed at room temperature with the advantages of green,environmental protection,energy-saving and high-efficiency.