Hydrosilylation of Allenes Over Palladium-Gold Alloy Catalysts: Enhancing Activity and Switching Selectivity by the Incorporation of Palladium into Gold Nanoparticles
route to alkenylsilnaes involving hydrosilylation of allenes by supported palladium-gold alloy catalysts has been developed. The catalytic activity and the product selectivity were drastically changed by the incorporation of palladium atoms into goldnanoparticles (NPs). The supported Pd-Au alloy catalysts with a low Pd/Au ratio were highly effective for the hydrosilylation at ambient temperature, in which
Cu(I)-NHC-Catalyzed Silylation of Allenes: Diastereoselective Three-Component Coupling with Aldehydes
作者:James Rae、Ya Chu Hu、David J. Procter
DOI:10.1002/chem.201404330
日期:2014.10.6
Copper‐catalyzed silylation of aryl allenes using a silylborane reagent affords vinyl silane building blocks with high efficiency. The use of a seven‐membered NHC ligand proved crucial for high regioselectivity. The catalytically generated allylcoppper intermediates were intercepted by aldehydes in a diastereoselective three‐component coupling to furnish homoallylic alcohols.
Copper-Catalyzed Enantioselective Hydroboration of Unactivated 1,1-Disubstituted Alkenes
作者:Won Jun Jang、Seung Min Song、Jong Hun Moon、Jin Yong Lee、Jaesook Yun
DOI:10.1021/jacs.7b08379
日期:2017.10.4
We report an efficient and highly enantioselectivehydroboration of aliphatic 1,1-disubstitutedalkenes with pinacolborane using a phosphine-Cu catalyst. The method allows facile preparation of enantiomerically enriched β-chiral alkyl pinacolboronates from a range of 1,1-disubstitutedalkenes with high enantioselectivity up to 99% ee. Unprecedented enantiodiscrimination between the geminal alkyl substituents
A Platinum Molecular Complex Immobilised on the Surface of Graphene as Active Catalyst in Alkyne Hydrosilylation
作者:Andres Mollar‐Cuni、Pilar Borja、Santiago Martin、Gregorio Guisado‐Barrios、Jose A. Mata
DOI:10.1002/ejic.202000356
日期:2020.12.7
A platinum complex bearing a N‐heterocycliccarbene (NHC) ligand functionalised with a pyrene‐tag is immobilised onto the surface of reduced graphene oxide (rGO). The hybrid material composed of an organometallic complex and a graphene derivative is ready available in a single‐step process under mild reaction conditions. This methodology preserves the inherent properties of the active catalytic centre
Regioselective Allene Hydroarylation via One-Pot Allene Hydrosilylation/Pd-Catalyzed Cross-Coupling
作者:Zachary D. Miller、John Montgomery
DOI:10.1021/ol502766q
日期:2014.10.17
Advances in hydroarylation have been achieved by the development of a one-pot regioselective allene hydrosilylation/Pd(0)-catalyzed cross-coupling protocol. The regioselectivity is primarily governed by N-heterocycliccarbene (NHC) ligand identity in the hydrosilylation step and is preserved in the subsequent cross-coupling reaction. This methodology affords streamlined access to functionalized 1,1-disubstituted