Ligand combined

This work was followed up by other research groups, using different substrates and other Pd-precursor/ligand combinations in molten [NBu4]Br for Heck coupling. 

Ligand Combination Strategy for the Preparation of Low-dimensional Metal Cluster Materials... 

I 6 Titanium Niobium Oxychlorides Ligand Combination Strategy... 

The Ligand Combination Approach to Creating Anisotropic Frameworks... 

I 6 Titanium Niobium Oxychlorides Ligand Combination Strategy [AsCTijCl,)] [(Nb6Cli204)3(Ti3Cl4)2] NbvSzIis... 

A broader and more important implication of the oxychlorides is the potential of expanding the ligand combination to other transition-metal cluster systems. The advances in soft-chemistry techniques open up new possibilities for the sta-... 

Long et al. reported the synthesis of tungsten oxychloride clusters via a soft-chemistry route [60], which confirms the potential for wide applications of the ligand combination strategy in cluster chemistry. 

The scope of this methodology was extended to the enantioselective cyclo-propylation of various aldehydes using dicyclopropylzinc in the presence of this norephedrine-derived thiophosphoramidate ligand combined with Ti(Oi-Pr)4 to achieve the corresponding cyclopropyl alkanols with enantioselectivities of up to 97% ee (Scheme 3.19). ... 

In recent years, the asymmetric hydrogenation of prochiral olefins have been developed in the presence of various chiral sulfur-containing ligands combined with rhodium, iridium or more rarely ruthenium catalysts. The best results have been obtained by using S/P ligands, with enantioselectivities of up to 99% ee in... 

In 1999, Casado et al. developed heterotetranuclear complexes (TiRh3) depicted in Scheme 10.3 with bridging sullido ligands combined with P-donor ligands. These complexes were further tested as catalysts for the asymmetric hydroformylation reaction of styrene. In this process, [CpTi((/i3-S)3 Rh(tfbb 3] was efficiently active under mild conditions (10 bar, CO/H2 = 1 atm, 353 K). In order to explore the effect of the added phosphorus ligand and the possibilities of this system for the asymmetric hydroformylation of styrene, achiral diphosphines such as dppe (l,2-bis(diphenylphosphine)ethane) and... 

A combination of P- and N- donors is another useful approach to potentially reactive (and cataly-tically active) Ni species. Similar to O- donors, N is a hard donor capable of stabilizing metal ions in higher oxidation states, whereas the soft donor P is best suited to stabilize medium or low oxidation states. A neutral bidentate P,N ligand combining a hard dimethylamino and a soft phosphine donor in /V,/V -dimethyl-2-(diphenylphosphino)aniline (241) affords the neutral trigonal bipyramidal and the... 

Cd thiolates and selenolates tend to form q-S- or q-Se-bridged dinuclear species, even with bulky organic groups, e.g., 2,4,6-tri-t-butylphenyl.317 318 With some ligand combinations, heterocubanes with Cd4S4 core or oligonuclear species derived from heterocubanes are formed.319,320... 

Fig. 26. Types of mixed-ligand oxotechnetium V) complexes combination of tridentate ligand with one (a) or two (b) monodentate ligands, combination of a bidentate with a second bidentate (c), or a tridentate (d) ligand...

The product was isolated on a preparative scale in an inert atmosphere glove box and the product formula was determined by complete elemental analysis. Yields varied depending on the specific metal/ ligand combination, but as much as 2-3 g of isolated product were obtained in some of the systems. 

To illustrate the problem the approach of Ammeter and Swalen(88) for the d1 configuration (represented by cobaltocene) is now followed, writing the a, ir, and 5 metal-ligand combinations as... 

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