9: Formation of Alkenes and Alkynes. Elimination Reactions
... They also show that the relative amounts of elimination and substitution products vary significantly depending on the structure of the substrate. Nucleophile versus Base. When ethoxide ion displaces a leaving group in a S N2 reaction, we call it a nucleophile. When ethoxide ion removes a β-H in an E ...
... They also show that the relative amounts of elimination and substitution products vary significantly depending on the structure of the substrate. Nucleophile versus Base. When ethoxide ion displaces a leaving group in a S N2 reaction, we call it a nucleophile. When ethoxide ion removes a β-H in an E ...
Grignard Reagents
... the hypothetical cleavage of a bond back to precursors of the target molecule. Functional Group Interconversion (FGI): the process of converting one functional group into another by substitution, addition, elimination, reduction, or oxidation ...
... the hypothetical cleavage of a bond back to precursors of the target molecule. Functional Group Interconversion (FGI): the process of converting one functional group into another by substitution, addition, elimination, reduction, or oxidation ...
Stockholm University
... 7), are tolerated under the applied reaction conditions. The reactions involving substituted allylacetates provide the branched products with very high regioselectivity. The diastereoselectivity of the reaction is also very high. In many cases a single diastereomer was obtained (Entries 2, 6, 7 and ...
... 7), are tolerated under the applied reaction conditions. The reactions involving substituted allylacetates provide the branched products with very high regioselectivity. The diastereoselectivity of the reaction is also very high. In many cases a single diastereomer was obtained (Entries 2, 6, 7 and ...
time-dependent density functional theoretical - Prof. Shih
... and molecules predicted by these GGA density functionals [9–12] are reasonably accurate, the excited-state energies and the ionization potentials obtained from the highest occupied orbital energies of atoms and molecules are far from satisfactory, typically 40 to 50% too low [13]. The problem of the ...
... and molecules predicted by these GGA density functionals [9–12] are reasonably accurate, the excited-state energies and the ionization potentials obtained from the highest occupied orbital energies of atoms and molecules are far from satisfactory, typically 40 to 50% too low [13]. The problem of the ...
Homogeneous Catalysis
... the endpoint indicator. You might not have noticed, however, what happens when a solution that contains phenolphthalein in the presence of excess base is allowed to stand for a few minutes. Although the solution initially has a pink color, it gradually turns colorless as the phenolphthalein reacts w ...
... the endpoint indicator. You might not have noticed, however, what happens when a solution that contains phenolphthalein in the presence of excess base is allowed to stand for a few minutes. Although the solution initially has a pink color, it gradually turns colorless as the phenolphthalein reacts w ...
Stoichiometry of Chemical Reactions
... Given the abundance of water on earth, it stands to reason that a great many chemical reactions take place in aqueous media. When ions are involved in these reactions, the chemical equations may be written with various levels of detail appropriate to their intended use. To illustrate this, consider ...
... Given the abundance of water on earth, it stands to reason that a great many chemical reactions take place in aqueous media. When ions are involved in these reactions, the chemical equations may be written with various levels of detail appropriate to their intended use. To illustrate this, consider ...
equilibrium - TeacherWeb
... The reaction quotient will equal the equilibrium constant, K, only if the system is at equilibrium: Q = K only at equilibrium. When Q > K, substances on the right side of the equation will react to form more reactants. When Q < K, the reaction will achieve equilibrium by forming more products. Q>K f ...
... The reaction quotient will equal the equilibrium constant, K, only if the system is at equilibrium: Q = K only at equilibrium. When Q > K, substances on the right side of the equation will react to form more reactants. When Q < K, the reaction will achieve equilibrium by forming more products. Q>K f ...
Organocatalysed asymmetric Mannich reactions
... the presence of L- or D-proline, followed by reduction of the resulting aldehyde with NaBH4 (Scheme 12).13 Although the yields were moderate (31–41%), the selectivity was outstanding in all cases (dr .19 : 1 (syn : anti), ee 99%; Rf = CF3, C2F5, ClCF2 and PhCF2). Therefore, this strategy can be used ...
... the presence of L- or D-proline, followed by reduction of the resulting aldehyde with NaBH4 (Scheme 12).13 Although the yields were moderate (31–41%), the selectivity was outstanding in all cases (dr .19 : 1 (syn : anti), ee 99%; Rf = CF3, C2F5, ClCF2 and PhCF2). Therefore, this strategy can be used ...
redox reaction - Seattle Central College
... d. Balance the electrons lost or gained, to conform to the Law of Conservation of Matter, by placing coefficients in front of the formulas containing the atoms oxidized and reduced to both sides of the equation. e. The remaining atoms are balanced by inspection f. Balance oxygen, or hydrogen by addi ...
... d. Balance the electrons lost or gained, to conform to the Law of Conservation of Matter, by placing coefficients in front of the formulas containing the atoms oxidized and reduced to both sides of the equation. e. The remaining atoms are balanced by inspection f. Balance oxygen, or hydrogen by addi ...
Chemistry Senior External Syllabus 1998
... The difficulties experienced by many candidates studying this subject externally are appreciated. It is realised that there is little opportunity to engage in subject matter other than that listed in the stated objectives. Candidates will be assessed by means of two examinations, and details of the ...
... The difficulties experienced by many candidates studying this subject externally are appreciated. It is realised that there is little opportunity to engage in subject matter other than that listed in the stated objectives. Candidates will be assessed by means of two examinations, and details of the ...