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Alcohols polydentate

The variety and extent of research devoted to ligands carrying both O- and N-donors is simply immense. The type of cobalt(III) systems extant include amino acids, amino alcohols, amino ethers, amino phosphates, amino phenolates, as well as amide and imine analogs of these. These are met as simple chelates or more elaborate polydentates. Here, we highlight a strictly limited selection of examples to illustrate the type of systems reported no attempt at exhaustive review has been made. [Pg.89]

Crans, D.C. and I. Boukhobza. 1998. Vanadium(V) complexes of polydentate amino alcohols Fine-tuning complex properties. J. Am. Chem. Soc. 120 8069-8078. [Pg.77]

Titanium chelates are formed from tetraalkyl titanates or halides and bi- or polydentate ligands. One of the functional groups is usually alcoholic or enolic hydroxyl, which interchanges with an alkoxy group, RO, on titanium to liberate ROH. If the second function is hydroxyl or carboxyl, it may react similarly. Diols and polyols, CC-hydroxycarboxylic acids and oxalic acid are all examples of this type. P-Keto esters, P-diketones, and alkanolamines are also excellent chelating ligands for titanium. [Pg.144]

Poncelet, O., Hubert-Pfalzgraf, L. G., Daran, J. C., and Astier, R., Alkoxides with polydentate alcohols Synthesis and structure of [Y(OC2H40Me)3]io, a hydrocarbon soluble cyclic decamer, J. Chem. Soc. Chem. Common., 1846 (1989). [Pg.53]

Besides mono- and bidentate phosphines, also ruthenium complexes with polydentate phosphines of the type RuCl2(triphos) (A) or RuCl2(tetraphos) (tetraphos = l,2-bis[(2-(diphenylphosphino)ethyl)(phenyl)phosphine]ethane) (B) have been investigated (Figure 1.8) [29], In the reaction with 1-hexene at a temperature of 150 C and 100 atm syngas pressure, the formation of aldehydes as well as alcohols was observed. [Pg.40]

Replacement of three C-substituents in phosphines by oxy groups produces triesters of phosphorous acid, also called phosphites. Such phosphites play a crucial role as mono- and bidentate ligands, but also as polydentate ligands, in numerous catalytic applications [1]. In Rh-catalyzed hydroformylation, they are indispensable in regioselective transformations at each scale. Several chiral phosphites based on rather complicated alcohols have also been designed for use in asymmetric hydroformylations [2]. [Pg.136]

M = group 13 metal R = Me, Et, etc.). Donor-functionalized alcohols (Fig. 32.1) are potentially polydentate ligands, which can give rise to compounds with enhanced stability through ligand chelation. The choice of functionalized alcohols is generally dictated by how well their metal complexes crystallize from common hydrocarbon solutions. [Pg.438]

In a related work, a design of enzyme-inspired star block-copolymers with branched topologies and protein-Hke tertiary or quaternary structures was performed. These polymers incorporate hydrophihc, superhydrophobic, and polydentate metal-binding sites and self-assemble in water, their mode of assembly being controlled by the composition of the polymer. An important feature of the star block-copolymers is that they incorporate perfluorocarbons and, due to that, their emulsions in water can attract and preconcentrate O2 in the vicinity of the active metal site. Addition of Cu(II) and TEMPO leads to an effective catalytic system for oxidation of alcohols to aldehydes in water. " ... [Pg.96]


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