Organic Dyes as Photoredox Catalysts
... the syntheses of an HMGCoA reductase inhibitor and a cyclooxygenase-2 inhibitor. ARENE FUNCTIONALIZATIONS The Nicewicz group recently showed that Mes–Acr+ and derivatives catalyze the direct C–H amination of electron rich arenes with nitrogen heterocyclic nucleophiles.5 The value of this method in d ...
... the syntheses of an HMGCoA reductase inhibitor and a cyclooxygenase-2 inhibitor. ARENE FUNCTIONALIZATIONS The Nicewicz group recently showed that Mes–Acr+ and derivatives catalyze the direct C–H amination of electron rich arenes with nitrogen heterocyclic nucleophiles.5 The value of this method in d ...
Alkene complexes - Dewar/Chatt/Duncanson model
... W(=CH2) 1.94 Å Difficult to separate effects of 3 components in metal complexes. Evidence for -donor orbital (cases where no -bonding is possible) Lewis adduct H3BCO. Complex has (CO) at 2164cm-1 , free CO at 2143cm-1 therefore C-O bond order is increased with donation, as predicted. Same f ...
... W(=CH2) 1.94 Å Difficult to separate effects of 3 components in metal complexes. Evidence for -donor orbital (cases where no -bonding is possible) Lewis adduct H3BCO. Complex has (CO) at 2164cm-1 , free CO at 2143cm-1 therefore C-O bond order is increased with donation, as predicted. Same f ...
Organometallic chemistry of mechanically interlocked transition
... Two ERC funded studentships are available to start in early 2016. The projects involve the synthesis and chemistry of interlocked systems featuring macrocyclic “pincer” ligands, currently being developed in the Chaplin group. These interlocked supramolecular systems will be used to study the fundame ...
... Two ERC funded studentships are available to start in early 2016. The projects involve the synthesis and chemistry of interlocked systems featuring macrocyclic “pincer” ligands, currently being developed in the Chaplin group. These interlocked supramolecular systems will be used to study the fundame ...
Lecture 7b - University of California, Los Angeles
... Nitric oxide is a by-product of combustion of substances in the air (i.e., car engines, fossil fuel power plants). In both cases, it is quickly oxidized to form nitrogen dioxide, which is removed using a catalytic converter. Nitric oxide is also produced naturally during the electrical discharge of ...
... Nitric oxide is a by-product of combustion of substances in the air (i.e., car engines, fossil fuel power plants). In both cases, it is quickly oxidized to form nitrogen dioxide, which is removed using a catalytic converter. Nitric oxide is also produced naturally during the electrical discharge of ...
Calculations using Orgel diagrams
... In crystal field theory interaction of the metal and ligand arise from the positive charge of the metal and negative charge on the ligands. The theory is developed by looking at the five degenerate d-orbitals and how the energies are changed on being surrounded by the negative point charges of the l ...
... In crystal field theory interaction of the metal and ligand arise from the positive charge of the metal and negative charge on the ligands. The theory is developed by looking at the five degenerate d-orbitals and how the energies are changed on being surrounded by the negative point charges of the l ...
Chapter 15 Complexation and Precipitation
... reagents was for titrating cations. In addition, many complexes are colored or absorb ultraviolet radiation; the formation of these complexes is often the basis for spectrophotometric determinations. Some complexes are sparingly soluble and can be used in gravimetric analysis. Complexes are also wid ...
... reagents was for titrating cations. In addition, many complexes are colored or absorb ultraviolet radiation; the formation of these complexes is often the basis for spectrophotometric determinations. Some complexes are sparingly soluble and can be used in gravimetric analysis. Complexes are also wid ...
18 electron rule overheads
... - eg fairly strongly antibonding (because 2nd/3rd row TMs bond more effectively to the ligands)∴eg empty e.g. [ZrF6]2- (Zr4+, d0, 12 e), [PtF 6]2- (Pt4+, d6, 18 e), [OsCl6]2- (Os4+, d4, 16 e), [WMe6] (W6+, d0, 12 e), [Zr(OH2)6]3+ (Zr3+, d1, 13 e) ...
... - eg fairly strongly antibonding (because 2nd/3rd row TMs bond more effectively to the ligands)∴eg empty e.g. [ZrF6]2- (Zr4+, d0, 12 e), [PtF 6]2- (Pt4+, d6, 18 e), [OsCl6]2- (Os4+, d4, 16 e), [WMe6] (W6+, d0, 12 e), [Zr(OH2)6]3+ (Zr3+, d1, 13 e) ...
Highly electron-deficient neutral and cationic zirconium complexes
... Figure 1. Molecular structure of 2. Selected bond distances (Å) and angles (deg): Zr-C(3) = 2.299(2), ZrC(12) = 2.328(1), Zr-N = 2.402(1), N-Zr-C(3) = 71.28(6), N-Zr-C(3a) = 151.18(6), N-Zr-C(12) = 71.74(5), N-ZrC(12a) = 87.95(5), N-Zr-N(a) = 135.69(5), C(3)-Zr-C(3a) = 85.18(6), C(3)-Zr-C(12) = 114. ...
... Figure 1. Molecular structure of 2. Selected bond distances (Å) and angles (deg): Zr-C(3) = 2.299(2), ZrC(12) = 2.328(1), Zr-N = 2.402(1), N-Zr-C(3) = 71.28(6), N-Zr-C(3a) = 151.18(6), N-Zr-C(12) = 71.74(5), N-ZrC(12a) = 87.95(5), N-Zr-N(a) = 135.69(5), C(3)-Zr-C(3a) = 85.18(6), C(3)-Zr-C(12) = 114. ...
Aldehydes and ketones
... • These names are taken from Latin roots as are the first 5 carboxylic acids • Greek letters are used to indicate the position of substituents with the carbon atom adjacent or bonded to the carbonyl carbon being the a carbon ...
... • These names are taken from Latin roots as are the first 5 carboxylic acids • Greek letters are used to indicate the position of substituents with the carbon atom adjacent or bonded to the carbonyl carbon being the a carbon ...
Transition Metals
... number of donor atoms bonded to the central metal atom or ion in the complex ...
... number of donor atoms bonded to the central metal atom or ion in the complex ...
Iron complexes of bidentate nitrogen donor ligands as
... A different approach, leading to the same result, is the so called reverse ATRP.2 This technique follows the same ATRP reactions of Scheme 1 but differs for the initiation reaction. In this case a typical radical initiator (e.g. 2,2’-azo-bisisobutyronitrile (AIBN), 1,1,2,2-tetraphenyl-1,2-ethanedio ...
... A different approach, leading to the same result, is the so called reverse ATRP.2 This technique follows the same ATRP reactions of Scheme 1 but differs for the initiation reaction. In this case a typical radical initiator (e.g. 2,2’-azo-bisisobutyronitrile (AIBN), 1,1,2,2-tetraphenyl-1,2-ethanedio ...
Open Access
... Catalysts are often based on transition metals due to their ability to bind a wide variety of molecules. The catalysis of chemical processes is divided into two fields, homogeneous catalysis where the catalyst is dissolved in the same phase as the substrate and heterogeneous catalysis where the cat ...
... Catalysts are often based on transition metals due to their ability to bind a wide variety of molecules. The catalysis of chemical processes is divided into two fields, homogeneous catalysis where the catalyst is dissolved in the same phase as the substrate and heterogeneous catalysis where the cat ...
24.2 Nomenclature and Coordination Chemistry
... Lewis Acid : e- acceptor (metals are good e- acceptor) Lewis Base : e- donor (Ligands with lone pair electrons) Ligands, atoms or cluster of atoms with lone pair electrons available to donate Complexing Agent: H2O, NH3, Cl- CN- ...
... Lewis Acid : e- acceptor (metals are good e- acceptor) Lewis Base : e- donor (Ligands with lone pair electrons) Ligands, atoms or cluster of atoms with lone pair electrons available to donate Complexing Agent: H2O, NH3, Cl- CN- ...
CARBONYL COMPOUNDS - Aldehydes and Ketones C=O C C C
... • ammoniacal silver nitrate - contains the diammine silver(I) ion - [Ag(NH3)2 ]+ • acts as a mild oxidising agent and will oxidise aldehydes but not ketones • the silver(I) ion is reduced to silver ...
... • ammoniacal silver nitrate - contains the diammine silver(I) ion - [Ag(NH3)2 ]+ • acts as a mild oxidising agent and will oxidise aldehydes but not ketones • the silver(I) ion is reduced to silver ...
Coordination Chemistry
... • As the [Ti(H2O)6]3+ complex absorbs visible light, the electron is promoted to a higher energy level. • Since there is only one d electron there is only one possible absorption line for this molecule. • Color of a complex depends on the magnitude of Δ which, in turn, depends on the metal and ...
... • As the [Ti(H2O)6]3+ complex absorbs visible light, the electron is promoted to a higher energy level. • Since there is only one d electron there is only one possible absorption line for this molecule. • Color of a complex depends on the magnitude of Δ which, in turn, depends on the metal and ...
Complexes of The Group 6 Elements
... shif in the series of complexes for each L-L ligand. The phosphorus coordination shift of the chelate lignad decreases on passing from chromium through tungsten, as observed in similar carbonyl-phosphine-metal(0) complexes. 10 This up-field shift of the phosphorus resonance signal by about 20 ppm up ...
... shif in the series of complexes for each L-L ligand. The phosphorus coordination shift of the chelate lignad decreases on passing from chromium through tungsten, as observed in similar carbonyl-phosphine-metal(0) complexes. 10 This up-field shift of the phosphorus resonance signal by about 20 ppm up ...
Lecture 2
... Chatt’s explanation: soft metals ACIDS have d electrons available for p-bonding Model: Base donates electron density to metal acceptor. Back donation, from acid to base, may occur from the metal d electrons into vacant orbitals on the base. ...
... Chatt’s explanation: soft metals ACIDS have d electrons available for p-bonding Model: Base donates electron density to metal acceptor. Back donation, from acid to base, may occur from the metal d electrons into vacant orbitals on the base. ...
Problem Set 5_Chem165_Spring14
... 11. Look at the Introduction of the recent review article, “Cross-Coupling Reactions Using Samarium(II) Iodide” M. Szostak, N. J. Fazakerley, D. Parmar, D. J. Procter Chem. Rev., DOI: 10.1021/cr400685rL. This article is “ASAP” – meaning “as soon as publishable” and it hasn’t been given page numbers ...
... 11. Look at the Introduction of the recent review article, “Cross-Coupling Reactions Using Samarium(II) Iodide” M. Szostak, N. J. Fazakerley, D. Parmar, D. J. Procter Chem. Rev., DOI: 10.1021/cr400685rL. This article is “ASAP” – meaning “as soon as publishable” and it hasn’t been given page numbers ...
Molecular Orbital Theory of Octahedral Complexes
... Molecular Orbital Theory of Octahedral Complexes In contrast to crystal field theory, molecular orbital included the covalent nature of the metal-ligand bond interaction. 1. No Metal- Ligand -bonding ( bonding only) Let’s take [Co(NH3)6]3+ as an example. Using the LGO method, one can construct a q ...
... Molecular Orbital Theory of Octahedral Complexes In contrast to crystal field theory, molecular orbital included the covalent nature of the metal-ligand bond interaction. 1. No Metal- Ligand -bonding ( bonding only) Let’s take [Co(NH3)6]3+ as an example. Using the LGO method, one can construct a q ...
Substitution reactions of carbonyl compounds at the α
... Normal enolates formed by the action of LDA or NaH can generally be alkylated with alkyl iodides, bromides or tosylates, or benzylic or allylic halides. However, these reactions can sometimes be difficult to perform in high yield. A few methods do exist which allow enolate alkylations in high yield, ...
... Normal enolates formed by the action of LDA or NaH can generally be alkylated with alkyl iodides, bromides or tosylates, or benzylic or allylic halides. However, these reactions can sometimes be difficult to perform in high yield. A few methods do exist which allow enolate alkylations in high yield, ...
Metal carbonyl
Metal carbonyls are coordination complexes of transition metals with carbon monoxide ligands. Metal carbonyls are useful in organic synthesis and as catalysts or catalyst precursors in homogeneous catalysis, such as hydroformylation and Reppe chemistry. In the Mond process, nickel carbonyl is used to produce pure nickel. In organometallic chemistry, metal carbonyls serve as precursors for the preparation of other organometalic complexes.Metal carbonyls are toxic by skin contact, inhalation or ingestion, in part because of their ability to carbonylate hemoglobin to give carboxyhemoglobin, which prevents the binding of O2.