5666-17-1Relevant articles and documents
Modular Attachment of Appended Boron Lewis Acids to a Ruthenium Pincer Catalyst: Metal-Ligand Cooperativity Enables Selective Alkyne Hydrogenation
Tseng, Kuei-Nin T.,Kampf, Jeff W.,Szymczak, Nathaniel K.
supporting information, p. 10378 - 10381 (2016/09/04)
A new series of bifunctional Ru complexes with pendent Lewis acidic boranes were prepared by late-stage modification of an active hydrogen-transfer catalyst. The appended boranes modulate the reactivity of a metal hydride as well as catalytic hydrogenations. After installing acidic auxiliary groups, the complexes become multifunctional and catalyze the cis-selective hydrogenation of alkynes with higher rates, conversions, and selectivities compared with the unmodified catalyst.
Impact of cyclodextrins on the behavior of amphiphilic ligands in aqueous organometallic catalysis
Bricout, Herve,Leonard, Estelle,Len, Christophe,Landy, David,Hapiot, Frederic,Monflier, Eric
supporting information, p. 1479 - 1484 (2012/11/13)
In this study, we showed that the addition of randomly modified β-cyclodextrin (RAME-β-CD) in aqueous medium could have a beneficial impact on the catalytic performances of phosphane-based aggregates in the Pd-catalyzed cleavage of allyl carbonates (Tsuji-Trost reaction). The RAME-β-CD/phosphane supramolecular interactions helped explain the catalytic results. The presence of RAME-β-CD in the aqueous compartment improved the phosphane-based aggregate dynamics. The exchanges between the hydrophobic substrate-containing aggregate core and the catalyst-containing aqueous phase were then greatly favored, resulting in an increase in the catalytic performances.
Scope and limitation of activated carbons in aqueous organometallic catalysis
Kania, Nicolas,Gokulakrishnan, Narasimhan,Leger, Bastien,Fourmentin, Sophie,Monflier, Eric,Ponchel, Anne
scheme or table, p. 208 - 218 (2011/04/21)
The effect of activated carbons has been studied in the palladium-catalyzed cleavage reaction of allylalkylcarbonate under aqueous biphasic conditions. A number of parameters were investigated, such as the type of carbon, the structure of the water-soluble ligand, the water conditions, and the metal complex loading. It was found that the intrinsic properties of carbons had a strong influence on the reaction rates. The best performances were obtained with the AC-WV carbon possessing the largest part of mesopores and lowest content of oxygen-surface groups. The results were rationalized by considering that AC-WV acted as a mass-transfer promoter increasing the interfacial area and collisions between the reactive species in the pore volume. The hypothesis of a confinement effect of the catalyst and reactants within the pores via adsorption-desorption processes was supported by isothermal studies and 31P{1H} NMR investigations.