摘要
本文介绍了一种从长叶烯制备异长叶烷酮的新工艺。以浓硫酸为催化剂,以冰乙酸为溶剂,先将长叶烯异构化成异长叶烯,再在同一介质中直接加入30％的过氧化氢,在指定的温度下反应6～8小时,主要产物是异长叶烷酮的两种差向异构体(α-和β-异构体)。它们的总含量达65％左右。经差向异构化反应后,β-异构体可转化为α-异构体,蒸馏后的产物中异长叶烷酮的含量提高到70～80％,产物中不含不饱和的异长叶烷酮。该工艺的特点是不需要将异长叶烯从长叶烯异构化混合物中分离出来,可直接氧化。与重铬酸盐法比较,本氧化反应无需使用大量的浓硫酸,氧化过程反应中不产生废渣,废气,更能适合于工业化生产。
This paper reports a novel process of preparing iso-longifolane ketone from longifolene.By using concentrated sulfuric acid as catalyst in glacial acetic acid, longifolene is isomerized to isolongifolene, following by adding 30% H_2O_2, isolongifolene is oxidized to isolongifolene ketone. Main products are two epimeric forms, α-epimer and β-epimer. Their total content is up to 65% β-epimer can be isomerized to a-epimer partially. After epimerization total content of isolongifolane ketone is increased to 70～80%. IR of the products show that unsaturated isolongifolene ketone is not present. One of the characteristics of this process is that isolongifolene does not need to be seperated from the mixture of isomerized produe. of longifolene.
出处
《香料香精化妆品》
CAS
1991年第2期1-5,共5页
Flavour Fragrance Cosmetics
