university of london thesis
... Thus, the primary aim o f this study was to try to “ tame” the carbocations involved in the SnI opening o f epoxides and thereby predict the outcome o f this type o f reaction. A few essential guidelines can already be drawn from previous studies on the subject, the main one being that the regiosele ...
... Thus, the primary aim o f this study was to try to “ tame” the carbocations involved in the SnI opening o f epoxides and thereby predict the outcome o f this type o f reaction. A few essential guidelines can already be drawn from previous studies on the subject, the main one being that the regiosele ...
Document
... used.for eg. [Co(NH2CH2CH2NH2)3]2(SO4)3 is named as : Tris(ethane-1,2-diammine)cobalt(III)sulphate ...
... used.for eg. [Co(NH2CH2CH2NH2)3]2(SO4)3 is named as : Tris(ethane-1,2-diammine)cobalt(III)sulphate ...
Features of the electronic structure of ruthenium tetracarboxylates
... orbitals of Ru2(P-O2CH)4(NO)2 (a) and Ru2(P-O2CH)4(ɇ2O)2 (b) complexes. The natural bond orbital allows us to understand the above differences. For each Ru2(P-O2CR)4 and Ru2(PO2CR)4(L)2 (R = H, CH3, CF3; L = H2O, THF) compound four bonding singly populated NBO are obtained. These orbitals describe t ...
... orbitals of Ru2(P-O2CH)4(NO)2 (a) and Ru2(P-O2CH)4(ɇ2O)2 (b) complexes. The natural bond orbital allows us to understand the above differences. For each Ru2(P-O2CR)4 and Ru2(PO2CR)4(L)2 (R = H, CH3, CF3; L = H2O, THF) compound four bonding singly populated NBO are obtained. These orbitals describe t ...
Synthesis, Properties and Chemistry of Xenon(II) Fluoride
... been written on this subject, e.g. books and review papers2-8, if we mention just a few. The recent review paper clearly shows that the interest in this fascinating subject has not diminished; on the contrary, we can even talk about the renaissance of the noble gas chemistry.9 Xenon(II) fluoride is ...
... been written on this subject, e.g. books and review papers2-8, if we mention just a few. The recent review paper clearly shows that the interest in this fascinating subject has not diminished; on the contrary, we can even talk about the renaissance of the noble gas chemistry.9 Xenon(II) fluoride is ...
Ch 10 Practice Problems 1. Consider the process A(l) A(s). Which
... C) greater than zero. D) More information is needed. q is A) less than zero. B) equal to zero. C) greater than zero. D) More information is needed. H is A) less than zero. B) equal to zero. C) greater than zero. D) More information is needed. E is A) less than zero. B) equal to zero. C) greater th ...
... C) greater than zero. D) More information is needed. q is A) less than zero. B) equal to zero. C) greater than zero. D) More information is needed. H is A) less than zero. B) equal to zero. C) greater than zero. D) More information is needed. E is A) less than zero. B) equal to zero. C) greater th ...
Organic Reactions in Organised Media
... containing the nonpolar reactant, the reaction may occur at the oil-water interface, i.e. the pore openings. The approach offers possibilities for reuse of the material since the particles can easily be removed from the reaction mixture by filtration or by centrifugation. Another potential use of me ...
... containing the nonpolar reactant, the reaction may occur at the oil-water interface, i.e. the pore openings. The approach offers possibilities for reuse of the material since the particles can easily be removed from the reaction mixture by filtration or by centrifugation. Another potential use of me ...
IR Spectroscopy and Mass Spectroscopy
... ¾ The C=O stretching vibrations of simple ketones, aldehydes, and carboxylic acids occur at frequencies around 1710 cm-1. ...
... ¾ The C=O stretching vibrations of simple ketones, aldehydes, and carboxylic acids occur at frequencies around 1710 cm-1. ...
PDF - Nanyang Technological University
... products with improved d.r. (syn/anti = 23:77), but with moderate ee values (Table 1, entry 7). Fortunately, with Et2O as the solvent, the reaction proceeded smoothly and gave 4 a with high enantioselectivity (97 %/94 % ee), moderate yield (56 %), but with poor diastereoselectivity (1:1, Table 1, en ...
... products with improved d.r. (syn/anti = 23:77), but with moderate ee values (Table 1, entry 7). Fortunately, with Et2O as the solvent, the reaction proceeded smoothly and gave 4 a with high enantioselectivity (97 %/94 % ee), moderate yield (56 %), but with poor diastereoselectivity (1:1, Table 1, en ...
Reaction Mechanisms of Metalloenzymes and Synthetic Model Complexes Activating Dioxygen
... Particularly interesting are the metal containing enzymes, also known as metalloproteins. They contain a metal ion cofactor, usually coordinated by nitrogen, oxygen or sulfur atoms from the polypeptide’s amino acids. The metal ion can be also coordinated by macrocyclic ligands incorporated in the pr ...
... Particularly interesting are the metal containing enzymes, also known as metalloproteins. They contain a metal ion cofactor, usually coordinated by nitrogen, oxygen or sulfur atoms from the polypeptide’s amino acids. The metal ion can be also coordinated by macrocyclic ligands incorporated in the pr ...
Neuman Chapter - Department of Chemistry
... The leaving group L (Figure 9.02) is a halogen X. Because we refer to the C-X carbon as Cα, and its adjacent C-H carbon as Cβ, we say that the H on Cβ is a β-hydrogen or a β-H. The elimination reactions of haloalkanes illustrate the fundamental features and mechanisms of many elimination reactions t ...
... The leaving group L (Figure 9.02) is a halogen X. Because we refer to the C-X carbon as Cα, and its adjacent C-H carbon as Cβ, we say that the H on Cβ is a β-hydrogen or a β-H. The elimination reactions of haloalkanes illustrate the fundamental features and mechanisms of many elimination reactions t ...
Difference in the Reactivities of H- and Me-Substituted Dinucleating
... ABSTRACT: The reactivity of dinucleating bis(iminopyridine) ligands bearing H (L1, (N,N′)-1,1′-(1,4phenylene)bis(N-(pyridin-2-ylmethylene)methanamine)) or Me substituents (L2, (N,N′)-1,1′-(1,4-phenylene)bis(N-(1(pyridin-2-yl)ethylidene)methanamine)) on the imine carbon atom with Ni(COD)2 (COD = 1,5- ...
... ABSTRACT: The reactivity of dinucleating bis(iminopyridine) ligands bearing H (L1, (N,N′)-1,1′-(1,4phenylene)bis(N-(pyridin-2-ylmethylene)methanamine)) or Me substituents (L2, (N,N′)-1,1′-(1,4-phenylene)bis(N-(1(pyridin-2-yl)ethylidene)methanamine)) on the imine carbon atom with Ni(COD)2 (COD = 1,5- ...
Recent Advances in the Measurement of Enantiomeric Excesses
... the Promotion of Science (JSPS). Since September 2001, he has been working with Prof. H. B. Kagan at Universite¬ Paris-Sud, Orsay as a post-doctoral fellow. He is currently involved in the study of non-linear effects and the development of new catalysts. ...
... the Promotion of Science (JSPS). Since September 2001, he has been working with Prof. H. B. Kagan at Universite¬ Paris-Sud, Orsay as a post-doctoral fellow. He is currently involved in the study of non-linear effects and the development of new catalysts. ...
Aromatic Substitution Reactions
... ophile, in a fashion very similar to the addition reactions described in Chapter 11, which begin by reaction of an electrophile with the pi electrons of an alkene. This results in the formation of a carbocation called an arenium ion. Removal of a proton from the arenium ion by some weak base that is ...
... ophile, in a fashion very similar to the addition reactions described in Chapter 11, which begin by reaction of an electrophile with the pi electrons of an alkene. This results in the formation of a carbocation called an arenium ion. Removal of a proton from the arenium ion by some weak base that is ...
ppt
... can attack from below, or above, the aldehyde. A mixture of the two enantiomers is formed. ...
... can attack from below, or above, the aldehyde. A mixture of the two enantiomers is formed. ...
File
... A sugar in which an amino group replaces a nonanomeric OH group. e.g. D-glucosamine. •D-glucosamine can be obtained by hydrolysis of chitin, a polysaccharide found in the shells of lobsters and crabs and in the external skeletons of insects and spiders. Glucosamine (C6H13NO5) is an amino sugar and ...
... A sugar in which an amino group replaces a nonanomeric OH group. e.g. D-glucosamine. •D-glucosamine can be obtained by hydrolysis of chitin, a polysaccharide found in the shells of lobsters and crabs and in the external skeletons of insects and spiders. Glucosamine (C6H13NO5) is an amino sugar and ...
Coordination Chemistry II: Bonding
... – c is the Coulombic energy of repulsion (always positive when pairing) and e is the quantum mechanical exchange energy (always negative). • e relates to the number of exchangeable pairs in a particular electron configuration. This term is negative and depends on the number of possible states. De ...
... – c is the Coulombic energy of repulsion (always positive when pairing) and e is the quantum mechanical exchange energy (always negative). • e relates to the number of exchangeable pairs in a particular electron configuration. This term is negative and depends on the number of possible states. De ...
Chemistry 3211 – Coordination Chemistry II
... populate the highest energy orbital. This results in a lowering of the overall ligand field stabilization energy for the complex. The distortion to give a square planar complex, where two of the ligands are removed entirely, is an extreme case of tetragonal distortion, but should not be confused wit ...
... populate the highest energy orbital. This results in a lowering of the overall ligand field stabilization energy for the complex. The distortion to give a square planar complex, where two of the ligands are removed entirely, is an extreme case of tetragonal distortion, but should not be confused wit ...
Structure and binding of Mg(II) ions and di-metal bridge
... OH is slightly tighter than that of H2O by around 0.175–0.200 Å, especially in the case of a single coordinating hydroxide ion. Biological ligand coordination to hydrated Mg(II) Significant variations are seen in the coordination distances of biological ligands bound with Mg2+ (Table S1). Water lig ...
... OH is slightly tighter than that of H2O by around 0.175–0.200 Å, especially in the case of a single coordinating hydroxide ion. Biological ligand coordination to hydrated Mg(II) Significant variations are seen in the coordination distances of biological ligands bound with Mg2+ (Table S1). Water lig ...
Hydroformylation
Hydroformylation, also known as oxo synthesis or oxo process, is an important homogeneously catalyzed industrial process for the production of aldehydes from alkenes. This chemical reaction entails the addition of a formyl group (CHO) and a hydrogen atom to a carbon-carbon double bond. This process has undergone continuous growth since its invention in 1938: Production capacity reached 6.6×106 tons in 1995. It is important because the resulting aldehydes are easily converted into many secondary products. For example, the resulting aldehydes are hydrogenated to alcohols that are converted to plasticizers or detergents. Hydroformylation is also used in specialty chemicals, relevant to the organic synthesis of fragrances and natural products. The development of hydroformylation, which originated within the German coal-based industry, is considered one of the premier achievements of 20th-century industrial chemistry.The process typically entails treatment of an alkene with high pressures (between 10 to 100 atmospheres) of carbon monoxide and hydrogen at temperatures between 40 and 200 °C. Transition metal catalysts are required.