| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing 2,3,5-trimethylhydroquinone diester. SOLUTION: This method comprises producing 2,3,5-trimethylhydroquinone diester by aromatizing 2,6,6-trimethylcyclohex-2-ene-1,4-dione (4-oxo-isophorone, keto-isophorone, KIP) by using an acylating agent and an acidic soluble or insoluble catalyst. The method comprises (a) using a 1-4C alkyl group-containing carboxylic acid anhydride as an acylating agent, after the reaction, (b) distilling away a produced carboxylic acid, if necessary, (c) cooling a reaction solution, (d) separating a crystallized product and cleaning the product and (e) returning a filtrate to the process (a).</p> |
