Phosphorous donors

Phosphorite deposits, 17 688, 691 Phosphorite uranium deposits, 17 520 Phosphorochloridate synthesis, 19 28 Phosphorodithioate DNA, 17 630 Phosphorodithioates, 17 630 Phosphorothioates, 17 629-630 synthesis of, 17 630 Phosphorous acid, 19 52 Phosphorous donor ligands, thorium and, 24 768 Phosphors... 

Dolichyl phosphate phosphatase has been described in animal tissues,74-76 and it is possibly responsible for the free dolichol found in tissues. This free dolichol can be rephosphorylated by a dolichol kinase using cytidine triphosphate (CTP) as phosphoric donor,77-78 or acylated by a dolichol acyltransferase79 (see Scheme 1). 

Transition metal complexes having phosphorous donor ligands have also been used as catalysts in the carbonyl ation of aromatic nitro compounds to carbamates. 

On the basis of DFT calculations, Li and Jones [27] had demonstrated that dissociation of one phosphorous donor ligand arm was feasible for (dippe)Ni(t] -C FlylCN. In ligands with a more flexible hgand backbone, such a dissociation process could potentially lead to catalyst decomposition. However, Because of the rigidity of our ligand backbone, the phosphorous donor cannot dissociate completely and remains in close proximity to the nickel center, thus possibly preventing catalyst decomposition. 

The tripodal ligand PhP(CH2CH2CH2PPh2)2 forms a rhodium complex [95] (shown below) which does not require dissociation of a phosphorous donor during the catalytic hydrogenation of alkene involving coordination of the alkene, hydride transfer to produce a metal alkyl, oxidative addition of H2, a second hydride transfer, elimination of the alkane, and regeneration of the catalyst. 

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