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6 results on '"Membrat, Romain"'

2. Phosphinous Acid Platinum Complex as Robust Catalyst for Oxidation: Comparison with Palladium and Mechanistic Investigations

Author

Membrat, Romain, Vasseur, Alexandre, Martinez, Alexandre, Giordano, Laurent, Nuel, Didier, Institut des Sciences Moléculaires de Marseille (ISM2), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
inorganic chemicals, [CHIM.ORGA]Chemical Sciences/Organic chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, [CHIM.CATA]Chemical Sciences/Catalysis
Abstract

International audience; Secondary phosphine oxides proved to be effective preligands to stabilise a hydroxy-platinum based catalyst that allows the aerobic/anaerobic oxidation of challenging sub-strates. Kinetic comparisons showed that this system is more efficient and stable than previously reported similar palladium-based catalysts. A neutral platinum dimer bearing bridging hydroxy ligands has been isolated and fully characterised by X-ray diffraction and its involvement in the mechanism has been evidenced by mechanistic studies.

Published
2018

5. Synthesis of chiral supramolecular bisphosphinite palladacycles through hydrogen transfer-promoted self-assembly process.

Author

Vasseur, Alexandre, Membrat, Romain, Palpacelli, Davide, Giorgi, Michel, Nuel, Didier, Giordano, Laurent, and Martinez, Alexandre

Subjects
*PALLADIUM compound synthesis, *HYDROGEN transfer reactions, *MOLECULAR self-assembly
Abstract

P-Chiral secondary phosphine oxides react with Pd2(dba)3 in an acidic medium to provide chiral supramolecular bisphosphinite palladacycles through a H-transfer-based self-assembly process prior to SPO-promoted oxidative addition of an acid to a Pd(0) centre. The one-pot methodology allows variations of the X-type ligand as desired. Eight complexes have been characterised by X-ray diffraction. [ABSTRACT FROM AUTHOR]

Published
2018
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6. Secondary Phosphine Oxides as Multitalented Preligands En Route to the Chemoselective Palladium-Catalyzed Oxidation of Alcohols.

Author

Vasseur, Alexandre, Membrat, Romain, Gatineau, David, Tenaglia, Alphonse, Nuel, Didier, and Giordano, Laurent

Subjects
*PALLADIUM, *PHOSPHINE oxides, *CHEMOSELECTIVITY, *NUCLEOPHILIC reactions, *BOND formation mechanism
Abstract

Secondary phosphine oxides O=PHR2 (SPOs) were identified as multitalented preligands for the chemoselective Pd-catalyzed oxidation of alcohols by a hydrogen-abstracting methodology. SPOs were found to promote the hydrogen-abstraction step as well as hydrogen transfer to a Michael acceptor by generating a putative active H−Pd species. The catalytic system operates under neutral conditions and was proven to be compatible with various electrophilic and nucleophilic functionalities within the substrates as well as water- and air-sensitive functional groups. [ABSTRACT FROM AUTHOR]

Published
2017
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