Zerovalent ruthenium(0) nanoparticles in the size range of 2.5 nm were easily prepared by chemical reduction of ruthenium salt with an excess amount of sodium borohydride and were efficiently stabilized by methylated cyclodextrins. The optimization of the catalytic system has been carried out in terms of stability and catalytic activity, considering the hydrogenation of olefinic compounds under biphasic liquid–liquid conditions. Efficient and controlled chemoselectivities were obtained in the hydrogenation of arene derivatives by the relevant choice of cavity and methylation degree of the cyclodextrins. Finally, the hydrogenation of α- and β-pinenes leads to the major formation of cis-pinanes, interesting synthons for fine chemistry, with high diastereoisomeric excesses.
零价
钌(0)纳米粒子尺寸范围为2.5纳米,通过用过量的氢化
钠还原
钌盐来轻松制备,并通过甲基化的
环糊精有效稳定。针对在两相液-液条件下烯烃化合物的氢化,进行了催化系统的稳定性和催化活性的优化。通过相应选择的
环糊精的腔体和甲基化程度,在
芳烃衍
生物的氢化过程中获得了高效且可控的
化学选择性。最后,α-和β-松烯的氢化主要生成了顺式松烷,这是一种高对映体异构体过剩的有趣合成单元,用于精细
化学。