Starting from small cyclic ketones, continuous flow synthesis is used to produce medium-sized rings and macrocycles that are relevant for the fragrance industry. Triperoxides are important intermediates in this process and are pyrolyzed at temperatures above 250 °C. The synthesis is carried out in two continuously operated flow reactors connected by a membrane-operated separator. The practicality of
从小环酮开始,连续流动合成用于生产与香料工业相关的中型环和大环。三过氧化物是该过程中的重要中间体,可在 250 °C 以上的温度下热解。合成是在两个连续操作的流动反应器中进行的,这些反应器由膜操作的分离器连接。在这项工作中,通过使用危险的试剂混合物(30% H 2 O 2、65% HNO 3)和同样有问题的过氧化物的热解,令人印象深刻地证明了流动化学的实用性。所有新的大环化合物都进行了与麝香相关的嗅觉特性测试。
Cyclooctane Metathesis Catalyzed by Silica-Supported Tungsten Pentamethyl [(SiO)W(Me)<sub>5</sub>]: Distribution of Macrocyclic Alkanes
作者:Nassima Riache、Emmanuel Callens、Manoja K. Samantaray、Najeh M. Kharbatia、Muhammad Atiqullah、Jean-Marie Basset
DOI:10.1002/chem.201403704
日期:2014.11.10
Metathesis of cyclic alkanes catalyzed by the new surface complex [(SiO)W(Me)5] affords a wide distribution of cyclic and macrocyclic alkanes. The major products with the formula CnH2n are the result of either a ringcontraction or ringexpansion of cyclooctane leading to lower unsubstituted cyclic alkanes (5≤n≤7) and to an unprecedented distribution of unsubstituted macrocyclic alkanes (12≤n≤40)