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本文报道了莪术二酮定量地异构化为莪术醇的新方法。实验证明,该异构化反应可以为Lewis acid(如AlCl_3等)所催化进行。其反应机理可能分两步进行。首先,在加热或有催化剂存在下,发生分子内的Ene cyclization reaction生成具有叔醇基和羰基的氢化菌类中间体;然后,迅速发生分子内缩合反应,生成具有半缩酮结构的莪术醇。此外,本文还报道了莪术醇能升华的性质。
This article reports a new method for the quantitative isomerization of Curdione to Curcumol. Experiments show that the isomerization reaction can be catalyzed by Lewis acid (such as AlCl 3). The reaction mechanism may be carried out in two steps. First, intramolecular Ene cyclization reaction occurs in the presence of a catalyst under heating or in the presence of a catalyst to produce a hydrogenated bacterial intermediate having a tertiary alcohol group and a carbonyl group. Then, an intramolecular condensation reaction occurs rapidly to produce curcumol having a hemiketal structure. In addition, this article also reported the nature of curcumol sublimation.