申请人:DAICEL CHEMICAL INDUSTRIES, LTD.
公开号:EP0850912A1
公开(公告)日:1998-07-01
This method provides a novel trimethylcatechol diester, i.e. 3,4,5-trimethylcatechol diester, at a high yield by reacting 2,6,6-trimethylcyclohexe-2-en-1,4-dione with an acylating agent in the presence of an acid catalyst. The acylating agent includes a C2-4 carboxylic acid anhydride (e.g. acetic anhydride) and a C2-4 carboxylic acid halide (e.g. acetyl chloride). The catalyst includes a protonic acid and a Lewis acid. Use of a polar solvent (e.g. halogenated hydrocarbon), as the reaction catalyst, results in an enhanced efficiency in the production of the object compound.
该方法通过使 2,6,6-三甲基环己-2-烯-1,4-二酮与酰化剂在酸催化剂存在下发生反应,以高产 量提供新型三甲基邻苯二酚二酯,即 3,4,5-三甲基邻苯二酚二酯。酰化剂包括 C2-4 羧酸酐(如乙酸酐)和 C2-4 羧酸卤化物(如乙酰氯)。催化剂包括质子酸和路易斯酸。使用极性溶剂(如卤代烃)作为反应催化剂,可提高目标化合物的生产效率。