Concept

Transmetalation

Related publications (70)

Palladium Alkynyl and Allenylidene Complexes: Very Efficient Precatalysts for C-C Coupling Reactions

Oxidative addition of BrC CC(=O)O-menthyl (1a) to [Pd(PPh3)(4)] affords the alkynyl complex trans-[Br(PPh3)(2)Pd-C CC(=O)O-menthyl] (2a). Subsequent reaction of 2a with trifluoroacetate gives trans-[(F3CCOO)(PPh3)(2)Pd-C CC(=O)O-menthyl] (3a). Reaction of ...

2011

High Relaxivity and Stability of a Hydroxyquinolinate-Based Tripodal Monoaquagadolinium Complex for Use as a Bimodal MRI/Optical Imaging Agent

Marinella Mazzanti

An octadentate ligand based on triazacyclononane and 8-hydroxyquinolinate/ phenolate binding units leads to very soluble, highly stable lanthanide complexes. The monoaquagadolinium complex shows a high relaxivity as a result of the unusually long rotationa ...

2011

Cross coupling of non-activated alkyl halides with alkynyl Grignard reagents catalyzed by a well-defined Ni pincer complex

Rosario Scopelliti, Xile Hu, Aurélien Godinat, Oleg Vechorkin

The nickel pincer complex 1 catalyzes the cross-coupling of the title compounds with remarkable substrate scope and functional group tolerance. A nickel/alkynyl species was isolated and shown to be catalytically competent. THF=tetrahydrofuran, O-TMEDA=bis[ ...

2011

Spaced Heterometallic 3d-4f Magnetic Chains from the Pseudo-One-Dimensional Na2LnMnO(AsO4)2 Series: Stepped Magnetization in the Na2GdMnO(AsO4)2 Ferromagnet

Wendy Lee Queen

Herein, we report the synthesis, structure, and magnetic properties of new 3d-4f solids Na2LnMnO(AsO4)2 (Ln = Sm3+, Gd3+, Dy3+) (the 2112 series) and their structural comparison with the Na3LnMn3O3(As04)3 (Ln = La3+, Sm3+, Gd3+) series (the 3133 series). T ...

2011

Synthetic Studies on the Sporolides: Exploration of the Enediyne Route

Karl Gademann, Simone Bonazzi, Jean-Yves Wach, Cindy Fellay, Massimo Binaghi

Synthetic studies towards the construction of the cyclopenta[a]indene fragment of the heptacyclic marine metabolite sporolide are reported based on a hypothetical biosynthesis. The key step of this biogenetic proposal includes a Bergman cyclization of an e ...

2010

Nitrile-functionalized pyrrolidinium ionic liquids as solvents for cross-coupling reactions involving in situ generated nanoparticle catalyst reservoirs

Paul Joseph Dyson, Rosario Scopelliti, Zhaofu Fei, Christian Hartinger, Yuehui Li, Xuemei Yang, Ilaria Biondi, Yugang Cui, Manish Chaubey, Cinzia Chiappe

Nitrile-functionalized pyrrolidinium-based ionic liqs. were prepd. and characterized by spectroscopic methods and x-ray crystallog. The application of these new ionic liqs. as reaction media for Suzuki and Stille C-C cross-coupling reactions was studied an ...

Royal Society of Chemistry2010

Highly stable and soluble bis-aqua Gd, Nd, Yb complexes as potential bimodal MRI/NIR imaging agents

Marinella Mazzanti

A tripodal ligand based on the 8-hydroxyquinolinate binding unit yields a soluble and highly stable bis-hydrated Gd3+ complex in water (pGd = 19.2(3)) with relaxivity change in the pH range 4.5-7.4 and Nd3+, Yb3+ analogues with sizeable NIR emission upon e ...

2010

Solvent-enhanced coupling of sterically hindered reagents and aryl chlorides using functionalized ionic liquids

Paul Joseph Dyson, Zhaofu Fei, Ning Yan, Yuehui Li, Xuemei Yang

A highly efficient and poison-resistant system for the Suzuki coupling reaction based on hydroxyl-functionalized ionic liq. solvents has been established. Coupling of RC6H4X (X = Br, I, Cl) and 2-bromothiophene with R1C6H4B(OH)2 in 2-hydroxyethyl-substitut ...

2009

Physicochemical Properties of the High-Field MRI-Relevant [Gd(DTTA-Me)(H2O)2]− Complex

Lothar Helm, Loïck Moriggi, Cora Prestinari

To study the physicochemical properties of the DTTA chelating moiety (H4DTTA = diethylenetriaminetetraacetic acid = N,N′-[iminobis(ethane-2,1-diyl)]bis[N-(carboxymethyl)glycine]), used in several compounds proposed as magnetic resonance imaging (MRI) contr ...

2008

Highly efficient MRI contrast agents

Loïck Moriggi

Since contrasts agents are used in magnetic resonance imaging (MRI), numerous efforts have been done to increase their relaxivity (parameter allowing to quantify contrast agent efficiency). Few years ago, the Merbach group developed the chelating agent DTT ...

EPFL2008

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