Chem 150 Unit 9 - Biological Molecules II
... Unit 9 - Biological Molecules II Carbohydrates Carbohydrates play many important roles in biological systems. They represent the major form of chemical energy for both plants and animals. In plants they represent the end product of photosynthesis, and therefore connect all living systems to the sun’ ...
... Unit 9 - Biological Molecules II Carbohydrates Carbohydrates play many important roles in biological systems. They represent the major form of chemical energy for both plants and animals. In plants they represent the end product of photosynthesis, and therefore connect all living systems to the sun’ ...
Porous Organic Polymers in Catalysis: Opportunities and Challenges
... and membranes for many uses, including water purification, water softening, and supports for synthesis. In the late 1980s, the copolymerization strategy was combined with the use of discrete molecular porogens to create molecularly imprinted polymers (MIPs). These latter materials have moderate (200 ...
... and membranes for many uses, including water purification, water softening, and supports for synthesis. In the late 1980s, the copolymerization strategy was combined with the use of discrete molecular porogens to create molecularly imprinted polymers (MIPs). These latter materials have moderate (200 ...
Lecture - Ch 18
... • Behave like acyclic ethers with the exception of three-membered ring epoxides – Strain of the three-membered ring gives epoxides a unique chemical reactivity ...
... • Behave like acyclic ethers with the exception of three-membered ring epoxides – Strain of the three-membered ring gives epoxides a unique chemical reactivity ...
Lecture 13 – Redox Reactions Between Metal Ions
... i) Outer Sphere: electron transfer is “through space” – the coordination sphere of the metal stays intact. ii) Inner Sphere: electron transfer takes place through a bridging ligand (through bonds) – the coordination sphere of the metals are altered in some ...
... i) Outer Sphere: electron transfer is “through space” – the coordination sphere of the metal stays intact. ii) Inner Sphere: electron transfer takes place through a bridging ligand (through bonds) – the coordination sphere of the metals are altered in some ...
幻灯片 1 - Sun Yat-sen University
... 3. Indicate the locations where replacements are made. Number in the direction that gives the smaller numbers for the locations of the branches. 4. Use prefixes when there is more than one alkyl branches of the same kind & for other types of substituents. 5. Cyclic Alkanes — indicates by cyclo befor ...
... 3. Indicate the locations where replacements are made. Number in the direction that gives the smaller numbers for the locations of the branches. 4. Use prefixes when there is more than one alkyl branches of the same kind & for other types of substituents. 5. Cyclic Alkanes — indicates by cyclo befor ...
Resolution of Diols via Catalytic Asymmetric Acetalization
... rac-2m proceeded with 2 mol% of 1a with a selectivity factor of 115 (entry 7). Interestingly, even the isopropyl-substituted diol rac-2n exhibited an impressive selectivity factor of 372, with only 1 mol% of the catalyst (entry 8). It is rather remarkable that such a high selectivity factor could be ...
... rac-2m proceeded with 2 mol% of 1a with a selectivity factor of 115 (entry 7). Interestingly, even the isopropyl-substituted diol rac-2n exhibited an impressive selectivity factor of 372, with only 1 mol% of the catalyst (entry 8). It is rather remarkable that such a high selectivity factor could be ...
Theoretical Study on Acetaldehyde and Ethanol Elimination from the
... reductive elimination step is favored by 34.1 kJ‚mol-1 in terms of activation energy. The approximate transition state for the 2 F 4 reaction is shown as TS(2 F 4) in Figure 3. It exhibits a stretched H-H bond at 0.985 Å, indicating that H2 activation as for the alternative path 2 F 3 F 4 is the cru ...
... reductive elimination step is favored by 34.1 kJ‚mol-1 in terms of activation energy. The approximate transition state for the 2 F 4 reaction is shown as TS(2 F 4) in Figure 3. It exhibits a stretched H-H bond at 0.985 Å, indicating that H2 activation as for the alternative path 2 F 3 F 4 is the cru ...
Reexamination of Aluminum Hydride as a Stereoselective Reducing
... ketones such as norcamphor and camphor at 0o afforded the thermodynamically less stable alcohols predominantly (Table 1). Thus, the reduction of norcamphor yields a mixture of exo- and endo- norborneol in the ratio of 20 : 80; the reduction of camphor yields a mixture of exo- and endoborneol in the ...
... ketones such as norcamphor and camphor at 0o afforded the thermodynamically less stable alcohols predominantly (Table 1). Thus, the reduction of norcamphor yields a mixture of exo- and endo- norborneol in the ratio of 20 : 80; the reduction of camphor yields a mixture of exo- and endoborneol in the ...
xidative=-Addition Reactions of Transition Metal Complexes
... H ~ ~ +Hz (and possibly with H20) which will be discussed later, these reactions have been shown to proceed The intensive study of oxidative-addition reactions through free-radical stepwise mechanisms illustrated by in our own and other laboratories in recent years has the reaction with H z 0 2 (eq ...
... H ~ ~ +Hz (and possibly with H20) which will be discussed later, these reactions have been shown to proceed The intensive study of oxidative-addition reactions through free-radical stepwise mechanisms illustrated by in our own and other laboratories in recent years has the reaction with H z 0 2 (eq ...
Reductive Coupling Reactions of Nitrones and Imines
... Since the first report of imine-carbonyl cross coupling in moderate to high yields using NbCl3 by Pederson in 1987,8 many other metal reductants have been employed, with varying degrees of success. Electrochemical reduction is the only method reported that allows intermolecular cross coupling of al ...
... Since the first report of imine-carbonyl cross coupling in moderate to high yields using NbCl3 by Pederson in 1987,8 many other metal reductants have been employed, with varying degrees of success. Electrochemical reduction is the only method reported that allows intermolecular cross coupling of al ...
Reactions of Aromatic Compounds
... • Alkyl groups stabilize the sigma complex by induction, donating electron density through the sigma bond. • Substituents with a lone pair of electrons stabilize the sigma complex by resonance. OCH3 ...
... • Alkyl groups stabilize the sigma complex by induction, donating electron density through the sigma bond. • Substituents with a lone pair of electrons stabilize the sigma complex by resonance. OCH3 ...
Structurally diagnostic ion/molecule reactions
... ICR,7 quadrupole ion traps,8 flowing afterglows9 and tripleand penta-quadrupoles,10 and the many scan modes they offer, make possible the isolation of the desired reacting ion with minimized internal energy, its reaction under lowenough energies to allow for efficient bimolecular reactions accompani ...
... ICR,7 quadrupole ion traps,8 flowing afterglows9 and tripleand penta-quadrupoles,10 and the many scan modes they offer, make possible the isolation of the desired reacting ion with minimized internal energy, its reaction under lowenough energies to allow for efficient bimolecular reactions accompani ...
Stereoisomers
... • A unidentate ligand is a ligand that can bind through only one atom. • A polydentate ligand is a ligand that can bind through more than one donor atom. • There are known examples of bidentate, tridentate, quadridentate, quinquedentate, and sexidentate ligands. • Chelate complexes are complexes tha ...
... • A unidentate ligand is a ligand that can bind through only one atom. • A polydentate ligand is a ligand that can bind through more than one donor atom. • There are known examples of bidentate, tridentate, quadridentate, quinquedentate, and sexidentate ligands. • Chelate complexes are complexes tha ...
Organic Synthesis II
... 1. Oxidation & Reduction in Organic Synthesis (T. J. Donohoe, OUP) 2. Organic Chemistry (Clayden, Greene, Wothers & Warren, OUP) ...
... 1. Oxidation & Reduction in Organic Synthesis (T. J. Donohoe, OUP) 2. Organic Chemistry (Clayden, Greene, Wothers & Warren, OUP) ...
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.