Palladium Nanoparticles Supported on Sulfonic Acid Functionalized Silica as Trifunctional Heterogeneous Catalysts for Heck and Suzuki Reactions
作者:Nicolas Oger、Erwan Le Grognec、François-Xavier Felpin
DOI:10.1002/cctc.201500179
日期:2015.7.13
successfully achieved by using trifunctional heterogeneous catalysts bearing Brønsted acid and metal active sites. The trifunctional materials were prepared by adsorption of palladium nanoparticles, generated by reduction of a solution of Pd(OAc)2 onto a commercially available sulfonic acid functionalized silica. These new trifunctional catalysts act as a 1) proton donor for the diazotization step, 2) counterion
通过使用带有布朗斯台德酸和金属活性位点的三官能均相催化剂,通过原位生成的芳基重氮盐,成功实现了丙烯酸酯和硼酸与苯胺的芳基化。通过吸附钯纳米颗粒来制备三官能材料,该钯纳米颗粒是通过将Pd(OAc)2的溶液还原到可商购的磺酸官能化的二氧化硅上而生成的。这些新的三官能催化剂充当1)重氮化步骤的质子供体,2)重氮盐的抗衡离子和3)偶联步骤的Pd源。这种无与伦比的策略具有温和安全的条件,因为它会在现场生成有害的芳基重氮盐,并且只会产生对环境无害的副产物,例如t BuOH,H 2O和N 2。