Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 42 for “"Imido"”.
-
Oxo, imido, and nitrido compounds of osmium(VI)
… tridotetrakis-(trimethylsilylmethyl)osmium, methylimidotetrakis(trimethylsilylmethyl)osmium, and Os(O)(CH$\sb2$SiMe$\sb3$)$\sb4$ are compared. The nitrido complex does not react with carbon monoxide while both the methyl imide and oxo compounds are reductively carbonylated under CO pressure. The …
-
Organometallic imido, sulfido and oxo complexes of osmium(VI)
… were synthesized in Chapter 2. Nitrido and imidoosmium(VI) complexes were prepared and their reaction chemistry was studied in Chapter 3. Improved syntheses of $(\eta\sp5$-C$\sb5$H$\sb5$)Os(N)(CH$\sb2$SiMe$\sb3)\sb2$ and $(\eta\sp5$-C$\sb5$Me$\sb5$)Os(N)(CH$\sb2$SiMe$\sb3)\sb2$ where …
-
Structure and reactivity of cyclic imido derivatives of phosphoric acid
New cyclic 1,3-diazaphospholidine-2,4,5-triones were synthesised and their solvolytic behaviour was studied. Methanolysis of 2-methylamino (24) and 2-dimethylamino (25) derivatives showed evidence of cleavage of both imide P-N bonds. This indicates that the ring opening in these derivatives is much …
-
Controlling electronics for the formation of high valent uranium imido complexes
… particular interest to our group are high-valent imido complexes, which are ubiquitous in organometallic and coordination chemistry due to their unique bonding properties and their ability to mediate bond-forming reactions. Uranium imido complexes, in particular, are the subject of much research …
-
Hydrosilylation and hydroboration catalyzed by imido-hydride complexes of molybdenum (IV)
… and catalytic reactivity of novel Mo(IV) imido hydride complexes (Cp)(ArN)Mo(H)(PMe3) (1) and (Tp )(ArN)Mo(H)(PMe3) (2). Both 1 and 2 catalyze hydrosilylation of a variety of carbonyls. Detailed kinetic and DFT studies found that 1 reacts by an unexpected associative mechanism, which does …
-
Synthesis, Structure, and Reactivity of osmium(VI) Nitrido, Imido, and Oxo Complexes
The syntheses of several dioxo dialkyl osmium (VI) complexes, OS(O)$\sb2$(CH$\sb2$SiMe$\sb3$)$\sb2$(py)$\sb{\rm x}$ (x = 1,2), 12, (Os(O)$\sb2$(CH$\sb2$SiMe$\sb3$)$\sb2$), 15 (n $>$ 2) and 16 (n = 1 and 2), and Os(O)$\sb2$(CH$\sb2$CPhMe$\sb2$)$\sb2$, 17, are discussed in Chapter 5. The reactivity …
-
Synthesis and Reactivity of ruthenium(VI) and osmium(VI) Nitrido and Imido Complexes
Reaction of [N(n-Bu)4][M(N)Me4] with Me3SiOSO2CF3 yielded the neutral complexes Os(NSiMe3)Me4 and Ru(NSiMe3)Me4. These complexes reacted with water to generate Me3SiOH, CH 4, (Me3Si)2O and insoluble metal-containing species. Both reacted with carbon monoxide to form acetone derived from the alkyl …
-
The utility of sulfur (IV) and selenium (IV) imido compounds in organic synthesis.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1977
-
Ligand variation in molybdenum imido alkylidene complexes : a synthetic, structural, and catalytic study
Chapter 1. A general introduction is given. Chapter 2. The biscarboxylate species, Mo(NR)(CHCMe 2Ph)(O 2CPh3)2 (R = 2,6-i-Pr2C6H3, 2,6- Me2C6H3, 2-t-BuC 6H4, or 1 -adamantyl) are compared to newly synthesized bis(terphenylcarboxylate) species, Mo(NR)(CHCMe 2Ph)(O 2CTer)2 (Ter = 2,6-diphenyl-4- …
-
Chiral molybdenum and tungsten imido alkylidene complexes as catalysts for asymmetric ring-closing metathesis (ARCM)
… -- Chapter 2. The synthesis of molybdenum(VI) imido alkylidene complexes containing racemic and optically pure biphenoxides (Biphen and Biad) is reported. -- Chapter 3. The 1H NMR spectroscopic data for molybdenum(VI) imido alkylidene biphenoxide complexes prepared in Chapter 2 are presented. …
-
Synthesis and reactivity of high oxidation state tungsten and molybdenum olefin metathesis catalysts bearing new imido ligands
Chapter 1 details the synthesis of tungsten imidoalkylidene compounds bearing strongly electron-withdrawing imido ligands. An alternative synthesis involving the treatment of WCl6 with 4 equivalents of N-trimethylsilyl-substituted anilines and subsequent workup with 1,2-dimethoxyethane (DME) has …
-
High oxidation state molybdenum and tungsten imido alkylidene and metallacycle chemistry : catalytic asymmetric olefin metathesis and mechanistic investigation
Enantiomerically pure molybdenum imido alkylidene complexes of the type Mo(NAr)(CHCMe₂Ph)[Ar'](THF), which contained 3,3'-diaryl (Ar' = Mes (21), Ph (22)) substituted binaphtholate ligands, were prepared and structurally characterized. Complex 21 was a trigonal bipyramidal anti alkylidene complex; …
-
Amidate complexes of the group 4 metals : sythesis, reactivity, and hydroamination catalysis
… with [Ph₃C][B(C₆F₅)4] or B(C₆F₅)₃ Terminal imido complexes with novel pyramidal geometries are generated through protonolysis of bis(amidate) bis(amido) Ti and Zr complexes with primary aryl amines. DFT calculations demonstrate the existence of a Zr⁻₌N triple bond for these complexes. …
-
Investigations of Iron–Nitrogen Bonding at Synthetic Iron–Sulfur Clusters
… the synthesis and characterization of a terminal imido complex of a cuboidal tetra(μ3-sulfido)tetrairon (Fe4S4) cluster. Structural, spectroscopic, and computational studies establish a dynamic interplay between Fe–N, Fe–S, and Fe–Fe interactions, tuned by the Fe centers’ locally high-spin …
-
Phosphorylid-Chemie an Niob(V)- und Tantal(V)-N-Organoimiden
Ziel der vorliegenden Arbeit war es, höhervalente Imido- und Amidoverbindungen des Niobs und Tantals zu synthetisieren und deren Reaktivität gegenüber Phosphoryliden zu untersuchen. Klassische Phosphorylid-Komplexe des Typs [LnM-CHR-PR'3] (R = Alkyl, Aryl, etc.) sind in der Literatur zahlreiche …
-
Investigations of sterically demanding ligands in molybdenum and tungsten monopyrrolide monoalkoxide catalysts for olefin metathesis
… substituent on the alkylidene points towards the imido ligand and anti where the substituent points away) reacts with MPCP to form an anti first-insertion product at low temperatures, which continues to propagate to give cis,syndiotactic polymer. At higher temperatures, the anti alkylidenes that …
-
DEVELOPMENT OF INNOVATIVE BURN RATE ADDITIVES FOR DOUBLE BASE PROPELLANT
… complexes, tetrakis (µ3-(4-methyl-3-nitrophenyl imido lead (II))) and bis(dinitrophenyl imido lead(II)) are reported as both a proof of concept and to determine a feasible synthetic pathway. After various unsuccessful attempts using common stabilizer molecules as ligands, n-phenylurea was …
-
Molybdenum alkylidene complexes : syntheses and applications to olefin metathesis reactions
Chapter 1. Alkylimido Molybdenum Complexes: Synthesis, Characterization and Activity as Chiral Olefin Metathesis Catalysts. Molybdenum olefin metathesis catalysts that contain previously unexplored aliphatic 1- phenylcyclohexylimido (PhCyN) and 2-phenyl-2-adamantylimido (PhAdN) groups were prepared …
Page 1 of 3