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Showing 1 to 20 of 38 for “"Cyclooctadiene"”.
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Studies of the mechanism of oxygen atom transfer from molecular oxygen to iridium-coordinated cyclooctadiene
The cyclooctadiene complex ((C$\sb8$H$\sb{12}$)Ir(P$\sb3$O$\sb9$)) ((n-C$\sb4$H$\sb9$)$\sb4$N) $\sb2$, a, reacted in solution at ambient temperature with O$\sb2$ to form ((C$\sb8$H$\sb{11}$OH)Ir(P$\sb3$O$\sb9$)) ((n-C$\sb4$H$\sb9$)$\sb4$N) $\sb2$, f. Sealed tube $\sp{31}$P NMR spectroscopic …
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The synthesis, characterization and decomposition studies of novel palladacycloalkanes and their precursors
… and palladacyclononane complexes based on 1,5-cyclooctadiene (COD), 2,2'bipyridine (bipy), triphenylphosphine (PPh3), and 1,2-bis(diphenylphosphino)ethane (dppe), and their precursors were successfully carried out. The complexes were characterized by 1H, 13C and 31p NMR spectroscopy, mass …
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THREE STUDIES OF 2-PYRIDONE PHOTOADDUCT REACTIVITY
… reactions, yielding strained tricyclic cyclooctadiene structures iv and v, with functionality at every carbon. As part of a program to develop the chemistry of these complex adducts, three studies have been conducted. Halogenation of trans iv give rearranged i. Cope rearrangement of cis …
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Synthesis, Characterization, and Ring -Opening Metathesis Polymerization Activity of Pentamethylcyclopentadienyl Osmium Complexes
… and [Cp*Os(COD)(CH3CN)]-[PF6 ]. Addition of 1,3-cyclooctadiene to Cp*2Os2Br 4 in refluxing ethanol affords the allyl complex Cp*Os(eta 3-C8H13)Br2. Treatment of the dimethyl compound Cp*Os(eta3-C4H7)Me2 with HBF4 and water affords the aqua-substituted complex, [Cp*Os(eta3-C4H7)(OH2)][BF …
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Fundamental and Applied Studies in Asymmetric Catalysis
… and (Rh(cod)(L*)) ClO4 (cod = eta2,eta 2-1,5-cyclooctadiene) were synthesized as templates for asymmetric catalytic reactions that could involve substrate precoordination to a Lewis acidic site remote from the transition metal reaction site. Primary amines were found to bind reversibly via a …
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Trispyrazolylborate and Tetramethylcyclopentadienyl Osmium Chemistry: Toward Methane Coordination Complexes
… of [(C5Me 4H)2OsBr]2[Os2Br8] with excess 1,5-cyclooctadiene (cod) in refluxing ethanol gives (C5Me 4H)2Os and [(C5Me4H)2OsBr][Os 2HBr4(cod)2]. An X-ray crystallographic study of the latter compound indicates that the anion adopts a confacial bioctahedral structure in which the hydride ligand …
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Synthesis of Platinum Dirhenium Dodecacarbonyl and Its Use as a Catalyst Precursor (Bimetallic, Rhenium, Heterogeneous)
… (M = Re,Mn) with Me(,2)Pt(COD) (COD = 1,5-cyclooctadiene) in the presence of CO leads to the formation of the heterobimetallic compounds Re(,2)Pt(CO)(,12) and Mn(,2)Pt(CO)(,12) in high yield. HM(CO)(,5) can be readily prepared and isolated in (TURN)85% yield by the reaction of M(CO)(,5)Br …
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Oxidative addition of amino acids to iridium(I) metal centers
… a.-amino acids to [Ir(COD)(PMe3)3]Cl (COD = cyclooctadiene) was studied and the reactivity of the resulting complexes was examined. The reaction of [Ir(COD)(PMe3)3]CI with the disubstituted amino acids, diphenylglycine and methyl phenyl alanine, led to an almost exclusive facial product. …
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Preparation of highly reflective films by supercritical infusion of a silver additive into poly(ether ether ketone)
… infusion of a silver-containing additive (1,5-cyclooctadiene- 1,1,1,5,5,5-hexafluoroacetylacetonato)silver(I) into a PEEK film was achieved with moderately high density CO2 at various temperatures, pressures, and times. During the infusion process: 1) polymer sample was exposed to both …
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Microwave-assisted Synthesis of Modified Cyclopentadienyl Iridium and Rhodium Chloro-bridged Dimers
… with [M(COD)](μ2 -Cl)2 (M = Rh, Ir; COD = 1,5-cyclooctadiene) gave the dimeric complexes [Cp*RMCl]2(μ2 -Cl)2 in yields ranging from 16 - 96%. The dimers were characterized by nuclear magnetic resonance (NMR)spectroscopy, single-crystal X-ray diffraction (XRD) (supplemented by powder XRD), …
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NMR/MRI SIGNAL ENHANCEMENT BY REVERSIBLE EXCHANGE (SABRE) AND HETEROGENEOUS SABRE (HET-SABRE)
… bis(2,4,6-trimethylphenyl)imidazol-2-ylidene; COD=cyclooctadiene)]--for performing SABRE in otherwise "pure" aqueous environments. Because of the poor aqueous solubility of SABRE catalysts, previous promising efforts have used co-solvents to achieve SABRE in aqueous/organic mixtures. However, I …
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Quantum dynamical study of Si(100) surface-mounted, STM-driven switches at the atomic and molecular scale
… the conformational switching of single 1,5-cyclooctadiene molecules chemisorbed on the Si(100) surface (Nacci et al., 2008). The temporal dynamics are provided by the propagation of the density matrix in time via an according set of equations of motion (EQM). The latter are based on the …
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Towards polyethylene-based materials with non-alternatively incorporated carbon monoxide monomer
… (ROMP) of 3-cyclopentanone with 1,5-cyclooctadiene followed by olefin hydrogenation were also pursued. Five new κ2-[phosphine-(di)phenolate]Ni(II)Me complexes with either mono- or trinuclear structures were also synthesized, characterized, and utilized in the catalytic …
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Organo-iridium compounds: synthesis, characterization and reactivity
… The compound, [lr(COD)(PMe3)3]CI (COD = 1,5-cyclooctadiene, Me = methyl), was synthesized and found to be water-soluble and fairly air-stable. Other water-soluble compounds, [lr(COD)(tripod)]CI, [lr(COD)(dmpe)]CI and [lrH(COD)(PMe3)3]CI2 [tripod = 1 ,1, 1-tris(diphenylphosphinomethyl)ethane, …
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Synthesis and characterization of Ir(III) metallacycles derived from thiophene and related compounds: models for the hydrodesulfurization process
… complex, [Ir(COD)(PMe<sub>3)3</sub>]Cl (COD=1,5- cyclooctadiene), with thiophene, thiazole, 4-methyl thiazole and 5-methyl thiazole yields the C-S addition metallacycles (Me₃P)₃Ir-(CH=CHCH=S)CI (I), \ (Me3P)3Ir-(CH=NCH=CHS)CI (II), (Me3P)3Ir-CCH=NC(CH3)=CHS)CI (III) and (Me3P)3Ir …
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Fluorinated boranes in dehydrocoupling and hydroboration
… In particular, the double hydroboration of 1,5-cyclooctadiene with Me2S·BH2(C6F5) resulted in isolation and crystallographic characterization of pentafluorophenyl-9-borobicyclo[3.3.1]nonane dimethylsulfide adduct, the –C6F5 substituted analog of the popular hydroboration reagent 9-BBN …
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Oxidative addition of N-H and O-H bonds to iridium: developing active catalysts for N-H and O-H additions to unsaturates
… to [Ir(COD)(PMe₃)₃]CI (<b>1a</b>) (COD = 1,5-cyclooctadiene) produces merIr( NR₂)H(PMe₃)₃CI (<b>2a-f</b>) complexes. That these amines were bound to iridium through an Ir-N bond was established by ¹H, ³¹P and ¹³C NMR spectroscopy, IR spectroscopy, C-H analyses and single crystal x-ray …
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Synthesis and hydrogenation of iridium complexes with bidentate and water-soluble phosphine ligands: developing novel water-soluble catalysts for hydrogenation of unsaturates
… The dimeric complex [Ir(COD)Cl]₂ (COD = 1,5-cyclooctadiene) has been found to undergo bridge-splitting reactions with bidentate phosphine ligands to produce coordinatively unsaturated, 16 electron complexes of the form [Ir(COD)(P-P)]Cl (P-P = bidentate phosphine). Two bidentate ligands were …
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Reactivity of rhodium-heteroatom bonds: from catalytic bond activation to new strategies for olefin functionalization
… and [Tp*Rh(cod)]2 (cod = cyclooctadiene) were evaluated for their activity in alkyne hydrophosphinylation in comparison to known catalysts for this reaction. [Tp*Rh(PPh3)2]and [Tp*Rh(cod)]2 were both shown to effect hydrophosphinylation of 1-octyne with diphenylphosphine …
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The Development of Novel Tools for the Metabolic Labelling of Glycans in Cancer
… The synthesis is reported of the first (E,Z)-cyclooctadiene. Its rate of IED-DA with tetrazines proved to be amongst the fastest reported under the same conditions. Finally, synthesis of some novel tagged fucose analogues is described. Glycan-labelling using these analogues is studied, …
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