Author: Tuan-anh Nguyen

Highly Functionalized Ferrocenes

2020

International audience; Ferrocene is unique among organometallic compounds, and serves notably as a versatile platform towards the production of ligands useful to promote transition metals chemistry. A general limiting aspect of the synthesis of ferrocene derivatives is the efficient access to sophisticated highly functionalized polysubstituted ferrocenes, i. e. bearing four or more substituents replacing hydrogen atoms on the cyclopentadienyl rings. These ferrocene derivatives can bear various functional or/and structuring spectator substituents. Their preparation involves synthetic difficulties resulting from the need of multiple functionalizations coexisting altogether, and satisfying fu…

Thesaurus (information retrieval)Setc.). Thus010405 organic chemistryChemistryOPNhighly functionalized ferrocenes010402 general chemistryN)-01 natural sciencesB)-and (NP)-0104 chemical sciencesInorganic ChemistryWorld Wide WebP')-which include notably (P(PB)-B)compounds[CHIM.COOR]Chemical Sciences/Coordination chemistryEuropean Journal of Inorganic Chemistry

researchProduct

Gold(I) Complexes Nuclearity in Constrained Ferrocenyl Diphosphines: Dramatic Effect in Gold‐Catalyzed Enyne Cycloisomerization

2020

International audience; Di-tert-butylated-bis(phosphino)ferrocene ligands bearing phosphino substituents R (R=phenyl, cyclohexyl, isopropyl, mesityl, or furyl) allow tuning the selective formation of Au(I) halide complexes. Thus, dinuclear linear twocoordinate, but also rare mononuclear trigonal three-coordinate and tetrahedral four-coordinate complexes were formed upon tuning of the conditions. Both Au(I) chloride and rarer Au(I) iodide complexes were synthesized, and their X-ray diffraction analysis are reported. The significance of the control of structure and nuclearity in Au(I) complexes is further illustrated herein by its strong effect on the efficiency and selectivity of gold-cataly…

Enyne010405 organic chemistryChemistryOrganic ChemistryCationic polymerizationRegioselectivityGeneral Chemistry[CHIM.CATA]Chemical Sciences/Catalysis010402 general chemistry01 natural sciencesBiochemistryMedicinal chemistryCycloaddition0104 chemical scienceschemistry.chemical_compoundCycloisomerizationFerroceneIntramolecular forceDiphosphines

researchProduct

Nanocatalysts for High Selectivity Enyne Cyclization: Oxidative Surface Reorganization of Gold Sub-2-nm Nanoparticle Networks

2021

International audience; Ultrasmall gold nanoparticles (NPs) stabilized in networks by polymantane ligands (diamondoids) were successfully used as precatalysts for highly selective heterogeneous gold-catalyzed dimethyl allyl(propargyl)malonate cyclization to 5-membered conjugated diene. Such reaction usually suffers from selectivity issues with homogeneous catalysts. This control over selectivity further opened the way to one-pot cascade reaction, as illustrated by the 1,6-enyne cycloisomerization–Diels–Alder reaction of dimethyl allyl propargyl malonate with maleic anhydride. The ability to assemble nanoparticles with controllable sizes and shapes within networks concerns research in sensor…

Materials scienceAlkyneLigands010402 general chemistry01 natural sciencesArticleenyne cyclizationCycloisomerizationCascade reactionSelectivity[CHIM.COOR]Chemical Sciences/Coordination chemistryQD1-999chemistry.chemical_classificationdiamondoidsEnyne010405 organic chemistryCombinatorial chemistryHydrocarbonsNanomaterial-based catalyst0104 chemical sciencesChemistrychemistryCyclizationColloidal goldgold sub-2-nm nanoparticlesPropargylnanocatalystsGoldSelectivityJACS Au

researchProduct

Unsymmetrically Substituted Bis(phosphino)Ferrocenes Triggering Through-Space 31(P, P′)-Nuclear Spin Couplings and Encapsulating Coinage Metal Cations

2021

International audience; We describe unsymmetrically substituted di-tert-butylated 1,1'-bis(phosphino)ferrocenes, with phosphino substituents R = [5-methyl]-2-furyl = Fu, and R' = phenyl (4a), i-propyl (4b). A modular synthetic approach was applied from the di-tert-butylated ferrocene platform (1), which lead to the formation of new diphosphines by using 1,1'bis(diiodo)-3,3'-bis(tert-butyl)ferrocene (2) as synthetic precursor. In contrast to the cousin non-alkylated unsymmetrically substituted diphosphino-ferrocenes which were reported up to now, these diphosphines showed strong (31 P, P')nonbonded (" ug-p e") nuclear spin-spin coupling. The strength of such internuclear spin-spin coupling c…

010405 organic chemistryChemistryOrganic Chemistry010402 general chemistrySpace (mathematics)01 natural sciences0104 chemical sciencesInorganic ChemistryMetalCrystallographyvisual_artvisual_art.visual_art_medium[CHIM.COOR]Chemical Sciences/Coordination chemistryPhysical and Theoretical ChemistryOrganometallics

researchProduct