Intramolecular cyclization of alkynoic acid catalyzed by Na-salt-modified Au nanoparticles supported on metal oxides
作者:Qi-An Huang、Takaaki Ikeda、Kazuki Haruguchi、Seiya Kawai、Eiji Yamamoto、Haruno Murayama、Tamao Ishida、Tetsuo Honma、Makoto Tokunaga
DOI:10.1016/j.apcata.2022.118765
日期:2022.8
Zirconia-supported sodium-salt-modified Au(0) nanoparticles (NPs) (Na-Au/ZrO2) catalyst was prepared, and it was stable and recyclable in the intramolecular cyclization of alkynoic acids. In particular, the effect of sodium species in Na-Au/ZrO2, which has been overlooked in previous studies, was studied, and they were found to play an essential role in the reaction. In addition, the relationship between
制备了氧化锆负载的钠盐修饰的Au(0)纳米粒子(NPs)(Na-Au/ZrO 2 )催化剂,该催化剂在炔酸的分子内环化反应中稳定且可回收。特别是Na-Au/ZrO 2中钠物质的影响在以往的研究中被忽视的 , 进行了研究,发现它们在反应中起着至关重要的作用。此外,Au NPs 的动力学与尺寸之间的关系表明,催化剂的活性位点位于负载型 Au NPs 的表面。此外,详细的动力学研究表明,环化是相对于底物浓度的零级反应,并且反应的速率决定步骤被认为是原型脱氧。5-己炔酸在连续流动反应器中反应的最大转换数(TON)超过了9000,这是在非均相Au催化剂存在下获得的最高TON。