Synthesis and Design of Ruthenium-Based Olefin Metathesis Catalysts Scavenger

• Main Authors: Yen-Chun Lee, 李彥君
• Other Authors: Yu-Ya Lin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/k7yw5p

碩士 === 國立中山大學 === 化學系研究所 === 106 === Grubbs catalyst is one of the most widely used olefin metathesis catalysts. Since ring-opening metathesis（ROM）and ring-closing metathesis（RCM）are the reverse reaction of each other, if the reaction was left for too long, the undesired reverse reaction may occur. In other cases, oligomers may be formed causing the low yield. Metal scavengers can deactivate the catalyst at the right time and can be useful for subsequent purification. In this thesis, silica nanoparticles modified with terminal olefins containing thioether functional groups were investigated as potential scavenger for ruthenium-based metathesis catalysts. We envision that the coordination of the chalcogens and olefins with the ruthenium metal in the catalyst would form a stable cyclic intermediate, which results in the poisoning of the catalyst. The used of modified nanoparticle has the advantages of having larger surface area and ease of separation by centrifugation. The effect of the amount of base and reaction time on particle diameter will be discussed. In addition, the method will be discussed to detectmine the quantity of olefinic functional groups modified on nanoparticles per unit weight. These include the hydroboration with catecholborane, and the indirect analysis of the particles using Ellman''s test. Finally, we will discuss the removal efficiency of the ruthenium metal catalyst.