| 摘要 |
<p>PROBLEM TO BE SOLVED: To produceδ-lactone which is useful as a perfume component and as an intermediate for industrial chemicals in high yield. SOLUTION: The subject compound, aδ-lactone, of formula I (R<1> is a 15C hydrocarbon; R<2> is H; R<3> , R<4> , R<5> and R<6> are independently H, a 1-15C chain type saturated hydrocarbon groups) is obtained by allowing a five-membered cyclic ketone of formula II to react with hydrogen peroxide and acetic acid in the presence of a strong acid catalyst such as sulfuric acid. At this time, the compound of formula II is added together with hydrogen peroxide to the reaction system in at least 50% of the addition time, while the strong acid catalyst and the acetic acid are previously added to the reaction system in the whole amount, or the whole amounts are added together with the compound of formula II, or a part is previously added, then all of the rest is added together with hydrogen peroxide and the compound of formula II. As for the amounts of individual reagents, acetic acid is preferably 1.0-5.0 times and the hydrogen peroxide is preferably 1.0-4.0 times the total molar amount of the compound of formula II.</p> |
