first line of title - University of Delaware
... to Fc0/+ set at 0 mV8. Dafc has been isolated as a solid in the neutral state, as well as in the oxidized state using AgOTf, [Fc][PF6] or TCNE and stabilized as a salt with OTf-, PF6- and TCNE--8. By this reasoning, dafc should be able participate in ligand based redox reactions. With this in mind, ...
... to Fc0/+ set at 0 mV8. Dafc has been isolated as a solid in the neutral state, as well as in the oxidized state using AgOTf, [Fc][PF6] or TCNE and stabilized as a salt with OTf-, PF6- and TCNE--8. By this reasoning, dafc should be able participate in ligand based redox reactions. With this in mind, ...
Scope and Limitations - Organic Reactions Wiki
... with few exceptions reported. In fact, the high level of anti selectivity that is observed in such dihydroxylations has led to a problem: how to overturn this bias and obtain dihydroxylation on the same face as the directing group? Because the facial bias of the substrate (particularly allylic alcoh ...
... with few exceptions reported. In fact, the high level of anti selectivity that is observed in such dihydroxylations has led to a problem: how to overturn this bias and obtain dihydroxylation on the same face as the directing group? Because the facial bias of the substrate (particularly allylic alcoh ...
Novel SnCl2-H2SO4 Mixed Catalyst System for Fructose
... water molecule coordinated on to the tin, and a second water molecule coordinated onto the first (Figure 3). It is widely used as a strong reducing agent in acid solutions and forms complexes with ligands [20,21]. It is also used in the Stephen reduction [22], whereby a nitrile is reduced to an alde ...
... water molecule coordinated on to the tin, and a second water molecule coordinated onto the first (Figure 3). It is widely used as a strong reducing agent in acid solutions and forms complexes with ligands [20,21]. It is also used in the Stephen reduction [22], whereby a nitrile is reduced to an alde ...
Synthesis, structure and catalytic activity of NHC-Ag(I)
... energy of its LUMO orbital towards nucleophilic attack. These observations led us to propose that N-heterocyclic carbene ligands may be better than pyridyl ligands for the O-H addition reaction: As better donors, they could facilitate the activation of the unsaturated carbon-carbon bond (step i), ...
... energy of its LUMO orbital towards nucleophilic attack. These observations led us to propose that N-heterocyclic carbene ligands may be better than pyridyl ligands for the O-H addition reaction: As better donors, they could facilitate the activation of the unsaturated carbon-carbon bond (step i), ...
06_chapter 1
... impregnation [31]. Catalyst prepared by solid state reaction was much active than the other and gave 90 % conversion and an operational period of 140 hours at 800 qC without much deactivation. Effect of nickel precursors on the activity of Ni/La2O3 catalysts was studied by Ruckenstein and Hu [32]. C ...
... impregnation [31]. Catalyst prepared by solid state reaction was much active than the other and gave 90 % conversion and an operational period of 140 hours at 800 qC without much deactivation. Effect of nickel precursors on the activity of Ni/La2O3 catalysts was studied by Ruckenstein and Hu [32]. C ...
File
... H CF3 H hydrate energies are also nearly HO OH HO OH equivalent). CF3 is a strong EWG, so O H CH3 H CF3 destabilizes the δ+ of the carbonyl, H CH3 G G+H-hydrate making the CF3 carbonyl higher in energy than the aldehyde. This makes the hydrate reaction of the CF3 carbonyl downhill, resulting in a hi ...
... H CF3 H hydrate energies are also nearly HO OH HO OH equivalent). CF3 is a strong EWG, so O H CH3 H CF3 destabilizes the δ+ of the carbonyl, H CH3 G G+H-hydrate making the CF3 carbonyl higher in energy than the aldehyde. This makes the hydrate reaction of the CF3 carbonyl downhill, resulting in a hi ...
Chem 2423-Test 2 - HCC Learning Web
... Identify the functional groups present in the compound below and predict the direction of polarity in each. 8. mustard gas Cl−CH2CH2−S−CH2CH2−Cl ...
... Identify the functional groups present in the compound below and predict the direction of polarity in each. 8. mustard gas Cl−CH2CH2−S−CH2CH2−Cl ...
Document
... • When a mixture of stereoisomers is possible from a dehydrohalogenation, the major product is the more stable stereoisomer. • A reaction is stereoselective when it forms predominantly or exclusively one stereoisomer when two or more are possible. • The E2 reaction is stereoselective because one ste ...
... • When a mixture of stereoisomers is possible from a dehydrohalogenation, the major product is the more stable stereoisomer. • A reaction is stereoselective when it forms predominantly or exclusively one stereoisomer when two or more are possible. • The E2 reaction is stereoselective because one ste ...
Recent Advances in the Measurement of Enantiomeric Excesses
... of the wavelength of the visible light. Feringa et al. succeeded in visualization of the enantiomeric excess of amine 16 and alcohol 13 by derivatizing to appropriate dopants and selecting the suitable liquid crystalline host material (Scheme 3).[23] As the host, the authors choose E7 which consists ...
... of the wavelength of the visible light. Feringa et al. succeeded in visualization of the enantiomeric excess of amine 16 and alcohol 13 by derivatizing to appropriate dopants and selecting the suitable liquid crystalline host material (Scheme 3).[23] As the host, the authors choose E7 which consists ...
Dissertation:
... and twenty vanadium were prepared. The solution structure of all complexes were examined and the solid state structures were determined for twenty of them. Tripodal diaminebis(phenolate) ligand generates tetra- and hexalithium complexes which reveal the cube, cube with oxygen bridged on two opposite ...
... and twenty vanadium were prepared. The solution structure of all complexes were examined and the solid state structures were determined for twenty of them. Tripodal diaminebis(phenolate) ligand generates tetra- and hexalithium complexes which reveal the cube, cube with oxygen bridged on two opposite ...
Ring-closing metathesis
Ring-closing metathesis, or RCM, is a widely used variation of olefin metathesis in organic chemistry for the synthesis of various unsaturated rings via the intramolecular metathesis of two terminal alkenes, which forms the cycloalkene as the E- or Z- isomers and volatile ethylene.The most commonly synthesized ring sizes are between 5-7 atoms; however, reported syntheses include 45- up to 90- membered macroheterocycles. These reactions are metal-catalyzed and proceed through a metallacyclobutane intermediate. It was first published by Dider Villemin in 1980 describing the synthesis of an Exaltolide precursor, and later become popularized by Robert H. Grubbs and Richard R. Schrock, who shared the Nobel Prize in Chemistry, along with Yves Chauvin, in 2005 for their combined work in olefin metathesis. RCM is a favorite among organic chemists due to its synthetic utility in the formation of rings, which were previously difficult to access efficiently, and broad substrate scope. Since the only major by-product is ethylene, these reactions may also be considered atom economic, an increasingly important concern in the development of green chemistry.There are several reviews published on ring-closing metathesis.