Since the first reports some three decades ago, the chemistry of pincer metal complexes has seen a tremendous development with impact on materials chemistry, supramolecular chemistry, bioorganometallics, and, presumably most significantly, on catalytic bond making and breaking processes. The conversion between the organolithium compounds L 1,2,4 Li and AsCl 3 led to the desired chlorides, i. The complexes self-assembled under aqueous conditions to form vesicles with bilayer membranes containing palladium species. Phenyl-2,6-bis oxazole ligands have been explored for the synthesis of novel palladium ii and platinum ii pincer complexes.
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SCS-pincer palladium-catalyzed auto-tandem catalysis using dendritic catalysts in semi-permeable compartments by Niels J. A range of chiral llei bis phosphite and phosphite—phosphinite ligands were produced and their propensity to form palladium PCP-pincer complexes examined.
The tether substituent at the central amine plays an active role in determining the coordination mode of the ligand and the metal geometry. Dendritic complex 4 has furthermore been used in the compartmentalized catalysis of single and auto-tandem reactions, allowing catalyst reuse for four consecutive runs. Wicker; Maren Pink; Daniel J. All studied compounds were characterized by the help of 1 H and 13 C NMR spectroscopy, ESI mass spectrometry, elemental analysis and except 1 by single-crystal X-ray diffraction.
Investigations of the photophysical properties revealed that the lowest triplet states of the materials are largely centred at the bis oxazole ligands.
Negishi cross-coupling reaction catalyzed by an aliphatic, phosphine based pincer complex of palladium. In 2-propanol-d 8 the pincer complexes catalyze the simultaneous deuteration and racemization of S phenylethanol, the two processes being strictly correlated.
Dalton Transactions (v.40, #35)
For both reactions much the same activity has been observed with the Ru and Os complexes. Back to tab navigation Fetching data from CrossRef.
The article was received on 04 Maraccepted on 13 Apr and first published on 31 May For reproduction of material from PPS: These complexes were successfully used as catalysts in the stannylation li cinnamyl chloride with hexamethylditin and in the catalytic auto-tandem reaction consisting of this stannylation followed by an electrophilic addition with 4-nitrobenzaldehyde, showing similar reaction rates and selectivities for all complexes.
Molecular structures of the neutral complexes 2a, 2b and 2c as well as the cationic complex 3c have been determined by X-ray single-crystal diffraction.
Amphiphilic pincer palladium complexes bearing hydrophilic and hydrophobic side chains on the planar NCN palladium pincer backbone were designed and prepared via the ligand introduction route. A terminal nickel ii anilide complex featuring an unsymmetrically substituted amido pincer leo Tuning ligand structure in chiral bis phosphite and mixed phosphite—phosphinite PCP-palladium pincer complexes by Robin B.
Back to tab navigation. On the other hand, the two new CNN pincer Ru ii complexes 5 and 7 displayed excellent catalytic activity in the transfer hydrogenation of ketones in refluxing 2-propanol with the latter being much more active.
A series of platinum ii complexes supported by the tridentate bis phosphine phosphido ligand li 2-diisopropylphosphinophenyl phosphide [ i Pr—PPP] have been synthesized and characterized 1—4.
Factors that influence the formation of four- or five-coordinate complexes with this ligand class are discussed. A mechanistic proposal for the enhanced reactivity and the role of EPR-detected Cu ii species will be discussed in detail.
LEI Reference Data
Isocyanide insertion and cyclization reactions to form indolines using pincer-type complexes of scandium by Benjamin F. Salah; Davit Zargarian Phenyl-2,6-bis oxazole ligands have been explored for the synthesis of novel palladium ii and platinum ii pincer complexes. The structure of 1 was determined by X-ray crystallography. Partial charge analysis shows a greater positive charge on the Ir in 3 compared to the Rh in 2.
Electrochemical studies revealed that both complexes undergo a 1-electron oxidation with the potential of the Rh complex 0.
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The study of the binding affinity of SO 2 and NO to complex 1 has also been addressed. The addition of methanesulfonic acid MSA to the di-deprotonated complexes enabled the recovery of 1 and 2, indicating that the thioamide moiety underwent a reversible deprotonation-protonation process, which resulted in regulating the redox potentials of the metal center.
Lej acetate 2 and the chloride 3 are monomeric in solid state. Lough; Quinn Major; Brandon Moore Synthesis, structure and catalytic activity in olefin polymerisation by Alexey V. Mechanistic analysis of trans C—N reductive elimination from a square-planar macrocyclic aryl-copper iii complex by Lauren M.
Three thioether bridged diimidazolium dibromides with different steric and electronic properties have been synthesized as precursors to carbene-based CSC pincer ligands.