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Showing 1 to 13 of 13 for “"titanium complexes"”.
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Catalytic hydrogenation using titanium complexes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Enantioselective synthesis of cyclic beta-amino alcohols via tandem hydroalumination-cyclization-reduction of ethoxycarbonyl vinyl sulfoximines and application to the synthesis of potential aggrecanase inhibitors
… are prepared from cyclic bis(allylsulfoximine)titanium complexes and N-tert-butylsulfonyl alpha-imino ester. The application of sulfoximine substituted bicyclic 1,2-amino alcohol in the synthesis of potential aggrecanase inhibitor is described.
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Group 4 metal and vanadium bis(phenolato) complexes : synthesis, structure and olefin polymerisation activity
… achiral bis(phenol) to a (R)-1,1’-bi-2-naphthoxy titanium species was not diastereoselective and reaction with 3,3’-substituted templates did not proceed at all. Surprisingly, the partial hydrolysis of [Ti{(R)-C20H12O2}{2,2’-(OC6H2-6-tBu-4-Me)2SC2H4S}] in acetone solution did proceed …
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Synthese, Kristallstrukturbestimmung und Magnetismus einiger Cyclopentadienyl-Derivate von Ti, Gd und Sm
… of mononuclear gadolinium and binuclear titanium and samarium compounds. In the case of Ti(III) and Sm(III) binuclear complexes with several bridging ligands and in the case of Gd(III) a mononuclear compound with cyclopentadienid ligands have been synthetized. The compunds were …
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Bis(pentafulven)komplexe des Titans
… are ideal candidates to stabilise group IV metal complexes in oxidation states lower than +2, a class of compounds which is still confined to rare examples. Starting from in 6-position bulky disubstituted pentafulvenes, a series of new bis(fulvene) and bis(benzofulvene) group IV compounds was …
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Synthesis and characterization of group IV metal complexes featuring tridentate diamidoamine ligands
… the preparation of five-coordinate zirconium and titanium complexes featuring tridentate diamidoamine ligands were developed. Zirconium dichloride complexes, [(Mes)N(CH2)2NR(CH 2)2N(Mes)]ZrCl2 (R=H, SiMe3), were synthesized via a one step toluene elimination reaction. Analogous titanium dichloride …
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Funktionalisierte hierarchisch gebildete Helicate
… three position were synthesised. These ligands, titanium(IV) and lithium form in a hierarchical self-assembly dinuclear triple stranded helicates. The first recognition step generates a mononuclear complex of three ligands and one metal ion. In a second recognition process two mononuclear …
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Novel Group 4 Metal Amido Complexes - syntheses, reactivity and olefin polymerization catalysis
… were also synthesized. The corresponding titanium and hafnium complexes of these ligands were synthesized using the amine / diethyl-ammonium chloride / toluene elimination and salt metathesis routes. These compl-exes were characterized by NMR and elemental analysis. Many of these complexes …
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Synthesis and reactivities of titanocene-oxo complexes and rhodium-catalyzed oxidative amidation
Oxo complexes of late transition metals have been used in a number of catalytic reactions such as C–H activation, epoxidation and water oxidation. In comparison, few studies have been published on terminal oxo complexes of group IV transition metals. The imido complexes of these metals, which are …
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Synthesis of Mononuclear Transition Metal Complexes and their Applications as Catalysts for Ethylene Polymerization
The synthesis of titanium, zirconium and vanadium complexes with bis(benzimidazole)s, bis(benzothiazole)s and bis(benzoxazole)s is a main objective of this study. Their catalytic performance towards ethylene polymerization reactions was also studied. The ligand systems mentioned above were …
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Asymmetric syntheses of anthraquinonyl C-glycosides
… reactions 81 and 120 employing the chiral titanium complexes Ti[(R)-BINOL]C12, Ti[(R)-BINOL]2, and Ti[R,R)-TADDOL]C12 were investigated. No reaction was observed when 0.5, 1.2 and 2 equivalents of Ti[(R)-BINOL]2 were used. However the complexes Ti[(R)-BINOL]C12 and Ti[(R,R)-TADDOL]C12 …
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Highly Efficient Catalysts for the Dimerization of α-Olefins
… potential of bis(imino)pyridin vanadium(III) complexes as catalysts for the oligomerization and dimerization of ethylene after activation with MAO. A series of new and literature known complexes was synthesized and tested for the homogeneous catalytic dimerization of propylene after activation …
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Templat-gesteuerte Synthese von Makrocyclen
… amide bond. The complexation of the ligand and titanium(IV) ions leads to the precursor of the molecular knot. Unfortunately the ring closing metathesis didn’t work in the desired way, so that the molecular knot couldn’t be prepared. An alternative which is based on triformylphloroglucinol was …