5728-52-9Relevant articles and documents
Robust, efficient, and recyclable catalysts from the impregnation of preformed dendrimers containing palladium nanoparticles on a magnetic support
Deraedt, Christophe,Wang, Dong,Salmon, Lionel,Etienne, Laetitia,Labrug?¤re, Christine,Ruiz, Jaime,Astruc, Didier
, p. 303 - 308 (2015)
The simple impregnation of ?3-Fe2O3(core)/SiO2(shell) magnetic nanoparticles with a dendrimer that contains stabilized Pd nanoparticles is presented as a new method to produce highly efficient heterogeneous catalysts. This technique provides much better stability, recyclability, and activity in C-C cross-coupling reactions and selective oxidation of benzyl alcohol to benzaldehyde in water than unsupported Pd nanoparticles.
Suzuki-Miyaura cross coupling is not an informative reaction to demonstrate the performance of new solvents
Sherwood, James
, p. 1001 - 1005 (2020)
The development and study of new solvents has become important due to a proliferation of regulations preventing or limiting the use of many conventional solvents. In this work, the suitability of the Suzuki-Miyaura reaction to demonstrate the usefulness of new solvents was evaluated, including CyreneTM, dimethyl isosorbide, ethyl lactate, 2-methyltetrahydrofuran (2-MeTHF), propylene carbonate, and γ-valerolactone (GVL). It was found that the cross coupling is often unaffected by the choice of solvent, and therefore the Suzuki-Miyaura reaction provides limited information regarding the usefulness of any particular solvent for organic synthesis.
Controlling Multiple Active Sites on Pd?CeO2 for Sequential C?C Cross-coupling and Alcohol Oxidation in One Reaction System
Antink, Wytse Hooch,Bok, Jinsol,Cho, Sung-Pyo,Choi, Hyunwoo,Hyeon, Taeghwan,Jung, Yoon,Kim, Do Heui,Kim, Jiheon,Kim, Jongchan,Kim, Ju Hee,Kim, Sumin,Kim, Young Gyu,Ko, Wonjae,Kwak, Minjoon,Lee, Byoung-Hoon,Lee, Chan Woo,Lee, Eunwon,Lee, Kug-Seung,Lee, Seong Chan,Yim, Guk Hee,Yoo, Dongwon
, (2022/01/22)
Ceria (CeO2)-supported metal catalysts have been widely utilized for various single-step chemical transformations. However, using such catalysts for a multistep organic reaction in one reaction system has rarely been achieved. Here, we investigate multiple active sites on Pd?CeO2 catalysts and optimize them for a multistep reaction of C?C cross-coupling and alcohol oxidation. Atomic-level imaging and spectroscopic studies reveal that metallic Pd0 and Pd?CeO2 interface are active sites on Pd?CeO2 for C?C cross-coupling and oxidation, respectively. These active sites are controlled under the structural evolution of Pd?CeO2 during reductive heat-treatments. Accordingly, we found that optimally reduced Pd?CeO2 catalysts containing ~1.5 nm-sized Pd nanoclusters with both sites in balance are ideal for multistep chemical transformations in one reaction system. Our strategy to design supported metal catalysts leads to one-pot sequential synthetic protocols for pharmaceutical building blocks.
Visible-Light-Enabled Carboxylation of Benzyl Alcohol Derivatives with CO2 Using a Palladium/Iridium Dual Catalyst
Iwasawa, Nobuharu,Jin, Yushu,Toriumi, Naoyuki
, (2021/12/14)
A highly efficient carboxylation of benzyl alcohol derivatives with CO2 using a palladium/iridium dual catalyst under visible-light irradiation was developed. A wide range of benzyl alcohol derivatives could be employed to provide benzylic carboxylic acids in moderate to high yields. Mechanistic studies indicated that the oxidative addition of benzyl alcohol derivatives was possibly the rate-determining-step. It was also found that a switchable site-selective carboxylation between benzylic C?O and aryl C?Cl moieties could be achieved simply by changing the palladium catalyst.