Heteropoly acid catalysis for the isomerization of biomass-derived limonene oxide and kinetic separation of the trans-isomer in green solvents
作者:Rafaela F. Cotta、Rafael A. Martins、Matheus M. Pereira、Kelly A. da Silva Rocha、Elena F. Kozhevnikova、Ivan V. Kozhevnikov、Elena V. Gusevskaya
DOI:10.1016/j.apcata.2019.117173
日期:2019.8
an abundant class of natural products, which is important for flavor and fragrance industry. Many acid catalyzed reactions used for upgrading terpenes still involve mineral acids as homogeneous catalysts and/or toxic solvents. Heteropoly acids represent a well-established eco-friendly alternative to conventional acid catalysts. As these reactions are usually performed in the liquid phase, solvents play
萜烯是一类丰富的天然产物,对香料和香精工业很重要。用于升级萜烯的许多酸催化反应仍然涉及无机酸作为均相催化剂和/或有毒溶剂。杂多酸是常规酸催化剂的公认的环保替代品。由于这些反应通常在液相中进行,因此溶剂对于工艺的可持续性起着至关重要的作用。在目前的工作中,我们开发了一种催化途径,可通过氧化silica烯使用二氧化硅负载的钨磷酸作为多相催化剂和碳酸二烷基酯作为绿色溶剂,从柠檬烯中异构化得到有价值的香气成分二氢香芹酮和香芹酮。只需更改反应温度,即可在二氢香芹酮和香芹酮之间切换反应途径(每种产率为90%)。此外,我们开发了一种高效的动力学分离方法反式-limonene从商业氧化物顺/反式-limonene氧化物混合物和立体选择性合成反式-dihydrocarvone。