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Showing 1 to 14 of 14 for “"phosphites"”.
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SYNTHESIS, CHARACTERIZATION, AND THERMAL INVESTIGATION OF METAL PHOSPHITES AND POTENTIAL IMPLICATIONS FOR ASTROBIOLOGY
… and thermal investigation of four metal phosphites with prebiotically plausible cations: Ca<sup>2+</sup>, Mg<sup>2+</sup>, Fe<sup>2+</sup>, and Fe<sup>3+</sup>. Structural characterization was conducted using nuclear magnetic resonance of phosphorus nuclei, infrared spectroscopy, …
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Study of the reaction of nitriles with dialkyl phosphites for synthesis of a-Amino-bis-phosphonates
<p>Amino bisphosphonate compounds are found in a vast array of products from water chelators to flame retardants to pharmaceuticals. Previous methods to synthesize these compounds involved the use of protic acids, which don’t provide ideal conditions for the starting materials containing acid …
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The Reactivity of Ditetrelenes Towards Organophosphorus Oxides
… of dialkyl and diarylphosphine oxides and phosphites with ditetrelenes 4 and 5 resulted in a 1,3-addition to form diorganodisilyl and digermyl phosphinites 27, 28, 31, 32 and disilyl phosphites 35 and 36. The 1,3-addition resulted in a mild two electron reduction of the P(V) centre of the …
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The effects of different concentrations of phosphite on ectomycorrhiza formation by Pisolithus tinctorius in Castanea dentata
Phosphites, salts of phosphorous acid, are used to combat the devastating root-rot diseases of American chestnut (Castanea dentata) and other woody plants caused by the Oomycete Phytophthora cinnamomi. However, phosphite treatments may negatively affect the plant’s ability to form ectomycorrhizas, …
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The synthesis, characterization and reactivity of metallacycloalkanes and their precursors
… (Ar = p-cymene and C6Me6, L = phosphines, phosphites and CO) have been carried out successfully. The complexes were obtained in good yields and characterized by 1 Hand 31 P NMR spectroscopy and elemental analysis. The dibromido complexes were then used in the preparation of osmium …
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Substitution and redox reactions of heptarhenium cluster derivatives
… in intrinsic reactivity for phosphines and phosphites, an intermediate configuration involving a bridging carbonyl has been proposed for the reaction of (Re$\sb7$C(CO)$\sb{21}$Rh(CO)$\sb2$) $\sp{2-}$ with various phosphorus donors (PY$\sb3).$
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Construction and Application of Reference Scales for the Characterization of Cationic Electrophiles and Neutral Nucleophiles
… of nucleophiles like enamines, phosphanes and phosphites, and pyridines as well as by adding new electrophiles. Kinetic data for electrophile-nucleophile combinations were used for discussing structure-reactivity relationships, as well as for the analysis of mechanistic aspects. Reversible …
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Zur rhodiumkatalysierten Hydroformylierung von Octenen : neue Ligand- und Lösungsmittelkonzepte
… glycols. The synthesis of monocyclic phosphites and their use in the hydroformylation of octenes allowed conclusions on the influence of the ligand backbone on activity and selectivity. Concerning temperature-dependent multi-component solvent systems, systems composed of propylene …
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Synthesis and application of chiral phosphorous triamide ligands
… is significantly different from the related phosphites or phosphoramidites and their potential in enantioselective catalysis is not yet fully explored.
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Axial chirale Phosphite als Liganden in der enantioselektiven Rhodium-katalysierten Hydrierung
… the corresponding bisphosphines the monodentate phosphites are much easier to sythesize and they are less sensitive towards oxidation. It is also easier to perform ligand tuning. These phosphite-ligands were tested in the Rhodium-catalized hydrogenation with different olefins. In the …
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Catalytic Activity of Tungsten-dioxo and Tungsten-diimido Complexes
… complexes via oxygen atom abstraction by phosphites was also shown. Diimido-tungsten complexes with pincer ligands were synthesized, characterized, and found to react through heterometathesis with a variety of substituted aldehydes to form imines and tungsten dioxo complexes. A variety of …
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Greener Photoredox-Catalyzed Phosphonations of Aryl Halides
… phosphonation of aryl halides using trialkyl phosphites will be presented. PTZ serves as a photocatalyst capable of reducing the aryl halide to access aryl radicals, which readily couple with phosphite esters. This transformation exhibits broad functional group tolerance in good to excellent …
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Routes to complexes of open chain polyethers
… provide a general route to complexes of primary phosphites (HO)2POR and of phosphorus(uI) acid; the t-butyl groups of cis- [PtC1(Ph3P) ((t-BuO)2POH) {(t-BuO)2P0}] are cleaved sequentially by CF3COOH, eventually forming cis-EPtC1(Ph3P){(H0)3P)RHO)2P0)], the crystal structure of which shows an …
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Design of New, More Stable, Precursors to Organopalladium(II) Complexes and Methods for the Palladium-Mediated Late-Stage Diversification of Pharmaceuticals
… of ancillary ligands ranging from phosphines to phosphites and bipyridyls from one common complex. The complexes generated were further applied to both stoichiometric and catalytic cross-coupling reactions. Chapter 3. A Neophyl Palladacycle as an Air- and Thermally Stable Precursor to Oxidative …