Eine einfache Synthese makrocyclischer Kohlenwasserstoffe durch Metathese von Cycloolefinen
作者:Siegfried Warwel、Hans Kätker
DOI:10.1055/s-1987-28129
日期:——
A Simple Synthesis of Macrocyclic Hydrocarbons by Metathesis of Cycloolefins Metathesis of cycloolefins normally leads to unsaturated polymers. Using rheniumheptoxide on alumina, activated by tintetramethyl and working in dilution via soxhlet-similiar circulation system the metathesis reaction was directed to macrocyclic dienes, which are the dimers of the initial cycloolefins. Starting with C7-, C9- and C10-cycloolefins symmetric macrocyclic C14-, C18- and C20-dienes are obtained in yields of 58-74%. The metathetic dimerization of cyclooctene leads to 1.9-cyclohexadecadiene in a yield of 30%. By hydrogenation at room temperature and normal hydrogen-pressure all cyclodienes were converted quantitatively to cycloalkenes (catalyst: potassium on alumina) or to cycloalkenes (catalyst: palladium on carbon).
通过环烯烃的交换反应合成宏环烃的简单方法
环烯烃的交换反应通常会导致不饱和聚合物。使用铝土矿上的七氧化铼,并通过类似索氏提取的循环系统进行稀释,反应被引导至宏环二烯,这是初始环烯烃的二聚体。从C7、C9和C10环烯烃出发,得到了对称的宏环C14、C18和C20二烯,产率为58-74%。环辛烯的交换二聚化反应生成1.9-环己十烯,产率为30%。在室温和常规氢压下,通过氢化,所有环二烯定量转化为环烯烃(催化剂:铝土矿上的钾)或环烯烃(催化剂:碳上的钯)。