Late Transition Metal Complexes Containing Tridentate Pincer-type 1, 3-bis (o-diphenylphosphino) Phenyl)-N, N'-heterocyclic Phosphenium/carbene Ligands - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Late Transition Metal Complexes Containing Tridentate Pincer-type 1, 3-bis (o-diphenylphosphino) Phenyl)-N, N'-heterocyclic Phosphenium/carbene Ligands write by Baofei Pan. This book was released on 2006. Late Transition Metal Complexes Containing Tridentate Pincer-type 1, 3-bis (o-diphenylphosphino) Phenyl)-N, N'-heterocyclic Phosphenium/carbene Ligands available in PDF, EPUB and Kindle.
Late Transition-metal Complexes Supported by Pincer Ligands
Late Transition-metal Complexes Supported by Pincer Ligands - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Late Transition-metal Complexes Supported by Pincer Ligands write by Wilson D. Bailey. This book was released on 2016. Late Transition-metal Complexes Supported by Pincer Ligands available in PDF, EPUB and Kindle. Late transition-metal pincer complexes of primarily palladium(II) and platinum(II) have been investigated for their application as catalysts in partial oxidation reactions. The epoxidation of higher olefins using molecular oxygen as the oxidant has been targeted, and the individual reaction steps needed to accomplish this overall transformation are described herein, including: (1) hydrogenolysis of a metal hydroxide (M-OH) species to yield a metal hydride (M-H), (2) insertion of O2 into the M-H bond to form a metal hydroperoxide (M-OOH), and (3) O-atom transfer from the M-OOH to epoxides, yielding a M-OH and completing the catalytic cycle. Previous results from our group on these individual transformations using (tBuPCP)Pd and (tBuPCO)Pd fragments are also reviewed. The requirements for O2 insertion into PdII and PtII hydrides are discussed. An array of cationic, neutral, and anionic Pd-H and Pt-H complexes supported by a tBuPNP backbone were synthesized and evaluated for O2 insertion (tBuPNP = 2,6-bis-(di-tbutylphosphinomethyl)pyridine). Metal-ligand cooperation was observed in the activation of H2 to form neutral hydride complexes. The effect of ligand protonation/deprotonation on the trans influence experienced by the hydride ligand was investigated. No reaction with O2 was observed with the cationic hydrides, while the neutral and anionic forms reacted with O2 at the tBuPNP backbone. The synthesis and characterization of mono- and dinuclear Pd-OH complexes supported by a PCNR pincer ligand (PCNR = (1-(3-((di-tert-butylphosphino)methyl)phenyl)-1H-5-R-pyrazole), R = H, Me) is presented. When R = H, ligand pyrazole "rollover" C-H activation was observed, forming a mixed ligand (PCNH)Pd(μ-OH)Pd(PCC) dinuclear structure. This "rollover" was investigated using DFT computations. The mono- and dinuclear hydroxide species were evaluated for hydrogenolysis. The dinuclear compounds {[(PCNR)Pd]2(μ-OH)}[OTf] reacted under an H2 atmosphere to yield the corresponding dinuclear hydrides {[(PCNR)Pd]2(μ-H)}[OTf]. A mechanistic study on the hydrogenolysis of the μ-bridged hydroxide {[(PCNMe)Pd]2(μ-OH)}[OTf] revealed first order kinetics in both [Pd] and [H2]. Terminal hydrides were not detected, and reduction of the mononuclear hydroxide complexes (PCNR)Pd-OH to Pd0 was observed under H2. The reduction was proposed to proceed through displacement of the pyrazole arm, and was examined by DFT computations. Lastly, a new strategy to promote O-atom transfer from M-OOH to epoxides, the final step in the targeted catalytic cycle, is proposed. Preliminary studies on NNNPyz, NNNEt, and NNMe ligated PdII and PtII are discussed (NNNPyz = 2,6-bis(5-tbutyl-1H-pyrazol-3-yl)pyridine; NNNEt = 2-(5-tbutyl-1H-pyrazol-3-yl)-6-(diethylaminomethyl)pyridine; NNMe = 2-(5-tBu-1H-pyrazol-3-yl)-6-methylpyridine). The NNNPyz ligand, containing two acidic sites in proximity to the fourth site in the square plane, was found to protonate M-O2 complexes, chelate to the metal center and oxidize phosphine substrates. Similar reactivity was observed with NNNEt and NNMe, however hemilability of these ligands resulted in undesired coordination modes.
Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine
Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine write by Susan Conde Guadano. This book was released on 2010. Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine available in PDF, EPUB and Kindle. The new indenyl-functionalised NHC potassium salt, 1-[3-(4,7-dimethylindenylpropyl)]-3- (2,6-diisopropylphenyl)imidazol-2-ylidenepotassium, has been synthesised. Complexes of titanium, zirconium and chromium containing this ligand and the two carbon bridge analogue, 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6-diisopropylphenyl)imidazol-2 ylidene potassium, have been synthesised and characterised by X-ray crystallographic techniques. The following complexes were tested as catalysts for the oligomerisation of ethylene in the presence of MAO: 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene(tertbutylimido) titanium chloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- dimethylindenyl)propyl]imidazol-2-ylidene(tert-butylimido)titanium chloride, 3-(2,6- diisopropylphenyl)-1-[3-(4,7-dimethylindenyl)propyl]imidazol-2-ylidenezirconium trichloride, 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]imidazol-2- ylidenezirconium trichloride, 3-(2,6-Diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]- imidazol-2-ylidenechromium dichloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- (dimethylindenyl))propyl]imidazol-2-ylidene chromium dichloride, 3-(2,6-diisopropylphenyl)- 1-[3-(4,7-dimethylindenyl)propyl]-imidazol-2-ylidene chromium methyl chloride and 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidenevanadium dichloride. The following alkyl chromium complexes containing 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6- diisopropylphenyl)imidazol-2 ylidene potassium have also been synthesised: 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium phenyl chloride and 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium dibenzyl. Chromium cations have been synthesised using as starting materials the chromium alkyl complexes. The Cr(II) complex 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7- dimethylindenyl)ethyl]-imidazol-2-ylidene chromium monochloride and a partially oxidised dimerised product were also isolated. 5-(2-chloroethyl)- 1, 2, 3, 4-tetramethylcyclopentadiene and 5-(3-chloropropyl) 1, 2, 3, 4-tetramethylcyclopentadiene were synthesised and isolated as geminal isomers for the first time. The trialkyl chromium complex, tribenzyl chromium tris(tetrahydrofuran) was synthesised and also it was used as starting material for the complexes di(benzyl)chromium bis(1, 3- diisopropylimidazol-2-ylindene) and tri(benzyl)chromium TACN. All complexes were characterised by X-ray crystallography. The imidazolium salt 3-(2.6-diisopropylphenyl)-1-[N, N-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride was synthesised and used as a precursor for the synthesis of amidinate-functionalised NHC zirconium and amidine-functionalised NHC silver complexes. Double deprotonation of 3-(2,6-diisopropylphenyl)-1-[N, N'-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride gave the amidinate-functionalised NHC ligand, 3-(2.6-diisopropylphenyl)-1-[2-N, N'bis(2,6 diisopropylphenylamidinate)ethyl]imidazol-2-ylidenepotassium. Titanium, zirconium and chromium complexes containing this ligand were synthesised and characterised by X-ray crystallographic techniques. Transmetallation of the amidine-functionalised NHC silver complex with [Rh(COD)Cl]2 and [Ir(COD)Cl]2 gave the corresponding species. Rh(amidinefunctionalised NHC)(COD)Cl reacted with Na(BAr)4 (Ar = 3,5-CF3C6H3) to give the cation Rh(amidine-functionalised NHC)(COD)]+[BAr4]-. These species were also characterised by X-ray diffraction techniques.
Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine
Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine write by Philip Edward Reedy. This book was released on 1987. Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine available in PDF, EPUB and Kindle.
Synthesis and Characterization of New Luminescent Late Transition Metal Complexes Containing the Tridentate 1,3-DI(N-pyrazolyl)-4,6-dimethyl Benzene Ligand
Synthesis and Characterization of New Luminescent Late Transition Metal Complexes Containing the Tridentate 1,3-DI(N-pyrazolyl)-4,6-dimethyl Benzene Ligand - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Synthesis and Characterization of New Luminescent Late Transition Metal Complexes Containing the Tridentate 1,3-DI(N-pyrazolyl)-4,6-dimethyl Benzene Ligand write by Brian Christopher Gruver. This book was released on 2008. Synthesis and Characterization of New Luminescent Late Transition Metal Complexes Containing the Tridentate 1,3-DI(N-pyrazolyl)-4,6-dimethyl Benzene Ligand available in PDF, EPUB and Kindle.
