1,721,031 research outputs found
The Wonder of Palladium Catalysis: From Carbon-Carbon to Metal-Carbon Bond Formation. An Opportunity of Getting Astonishment from Reality
No full text
Use of Palladium-Catalyzed Coupling Reactions in the Synthesis of Heterobimetallic Complexes. Preparation of Bis(cyclopentadienyl) Complexes Linked by a (Z)-1,3 Enyne Bridge
No full textA new frontier in the metal-catalyzed cross-coupling reaction field. The palladium-promoted metal-carbon bond formation. Scope and mechanism of a new tool in organometallic synthesis
No full textThe synthetic uses and the investigation of the reaction mechanism of the Pd-catalyzed metal/carbon bond-formation process are accounted. Preparations of simple s-metal metal acetylides of typeM/C/C/R (M/Fe, Ru, Mo, W; R/H, Alkyl, Ph), homo and heterobimetallic complexes of type M/C/C/Thiop/C/C/M? (Thiop/2,5-thiophene; M, M?/Fe, Ru, Mo, W), polymetallaacetylide tethers of type M/C/C/Thiop/C/C/M?(h5-Cp)/C/C/Thiop/C/C/(h5-Cp)M?/C/C/Thiop/C/C/M (M/Re, Mn;M?/Fe), and metallaacetylide polymers of type [/M/C/C/Ar/C/C/]n (Ar/2,5-thiophene, 1,4-phenylene) are reported. By the use of properly designed model substrate principal intermediates (i.e. oxidative addition, transmetalation) involved in the catalytic cycle have been isolated and fully characterized. Kinetic and spectroscopic studies of the reaction mechanism have evidenced that,
depending from the reaction conditions, the transmetalation step may proceed by two pathways: (i) in concentrated solutions of the complex of oxidative addition (/104 M), the reaction proceeds through formation of a highlyreactive solvent-coordinate species (dissociative mechanism). These results are showing clear analogies with mechanistic studies of the carbon/carbon coupling process, thus with the use of these model substrates, a unique opportunity to investigate factors
affecting the metal/carbon bond formation reaction is offered, as well as the possibility to shed light on unclear aspects of the carbon/carbon coupling itself, a phenomenon of paramount importance in synthetic organic chemistry
Preparation of a Bis(cyclopentadienyl)acetylene-framed Heterobimetallic Complexes and its Reaction with Dicobalt Octacarbonyl
No full textMethyl-iodine exchange in (η5-iodocyclopentadienyl)metallo methyl derivatives of iron(II), tungsten(II), and molybdenum(II) in the presence of palladium
No full text- …
