'Isotope effect' presentation slideshows

OXIDATIVE PREPARATION OF ALDEHYDES AND KETONES

OXIDATIVE PREPARATION OF ALDEHYDES AND KETONES. REMEMBER: Go back to Special Topics Box at the beginning of Chapter 14. Conversion of an alcohol to an aldehyde or ketone represents an oxidation (removal of H atoms).

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GE 14a 2019 Lecture 6 GRAVITATIONAL AND CENTRIFUGAL SEPARATIONS OF ISOTOPES

GE 14a 2019 Lecture 6 GRAVITATIONAL AND CENTRIFUGAL SEPARATIONS OF ISOTOPES.

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SUPERCONDUCTING MATERIALS

0.15 0.10 0.0. Resistance ( ? ). T c. 4.0 4.1 4.2 4.3 4.4 Temperature (K). SUPERCONDUCTING MATERIALS. Superconductivity - The phenomenon of losing resistivity when sufficiently cooled to a very low temperature (below a certain critical temperature).

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Quantum Dynamics Studies of Anomalous Isotope Effects

Quantum Dynamics Studies of Anomalous Isotope Effects. Dmitri Babikov Marquette University, Chemistry Department Milwaukee, Wisconsin, USA. Outline. What we learned about the MIF from studies of the anomalous isotope effect in O 3 ?

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Question: can be obtained the rate of the elementary reactions from steady-state kinetics?

Question: can be obtained the rate of the elementary reactions from steady-state kinetics?. k 2 [E] t [S]. v i =. k -1 + k 2. + [S]. k 1. No: there are more unknown parameters than equations!. More informations from pre-steady-state kinetics, but the techniques are complicated

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Dehydration of Alcohols

Dehydration of Alcohols. Elimination Reactions. Y. C - C. X. To make C=C need to eliminate X, Y. Y. 3 ways to break 2 bonds. C - C. X. 1. Concerted (x and y leave same time) 2. X leaves first 3. Y leaves first. Leaving Group. Mechanism. Mechanism. E1 Reaction. R-X.

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Dehydration of Alcohols

Dehydration of Alcohols. Elimination Reactions. Y. C - C. X. To make C=C need to eliminate X, Y. Y. 3 ways to break 2 bonds. C - C. X. 1. Concerted (x and y leave same time) 2. X leaves first 3. Y leaves first. Leaving Group. Mechanism. Mechanism. E1 Reaction. R-X.

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C A R I B I C

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Study of Enzyme Mechanisms

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Dehydration of Alcohols

Dehydration of Alcohols. Elimination Reactions. Y. C - C. X. To make C=C need to eliminate X, Y. Y. C - C. X. 3 ways to break 2 bonds. 1. Concerted (x and y leave same time) 2. X leaves first 3. Y leaves first. Leaving Group. E1 Reaction. R-X. R + + X -. Alkene + H +.

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Kinetic Isotope Effects in Transition Metal-catalyzed C-H Activation

Kinetic Isotope Effects in Transition Metal-catalyzed C-H Activation. Speaker: CHENG Guijuan Apr. 17 th , 2014. Preface. Tools of physical organic chemistry. crossover experiments kinetic studies isotope labeling linear free-energy relationships (LFER)

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Isotopic Fossils

Isotopic Fossils. Acknowledgements: Hedges/Keil/Wakeham U. Washington: Aquatic Org. Geochemistry ML Fogel and LA Cifuentes, Isotope fractionation duringprimary production JM Hayes: Fractionation of the isotopes of carbon and hydrogen in biosynthetic processes

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Chapter 3: Nucleophilic catalysis

Chapter 3: Nucleophilic catalysis. Principle: reaction rate is enhanced by a nucleophilic compound that forms a low-energy intermediate. Of course, the nucleophile does not end up in the reaction product. Criteria for a nucleophilic catalyst:

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ISOTOPE EFFECTS

usually has no effect on the qualitative chemical reactivity of the substrate. replacement of an atom by one of its isotopes. often has an easily measured effect on the rate at which reaction occurs. ISOTOPE EFFECTS.

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W HAT IS S UPERCONDUCTIVITY? Basic expt: (Onnes 1911)

W HAT IS S UPERCONDUCTIVITY? Basic expt: (Onnes 1911). V. Cu A l Cu. ~. S. S. perfect diamagnetism (Meissner effect) equilibrium effect. persistent currents, astronomically stable metastable effect.

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A magnetic analog of the isotope effect in cuprates

A magnetic analog of the isotope effect in cuprates. Amit Keren. Ph.D. Amit Kanigel Ph.D. Rinat Ofer MSc . Yuval Lubashevsky Ph.D. Eran Amit Ph.D. Gil Drachuck. Collaborators G. Bazalitski -Technion A. Knizhnik -Technion J. Lord-ISIS Amato-PSI O. Chmaissem -ANL Wilds-ILL

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Introduction

1. 2. 7. 3. 4. 5. 8. 6. Application of Environmental Isotopes in Studies of Biodegradation of Organic Contaminants in Groundwater Ramon Aravena, Department of Earth Sciences, University of Waterloo, Waterloo, Canada

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Adsorption and recombination via abstraction of H(D) on graphite (0001) surfaces

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Adsorption and recombination via abstraction of H(D) on graphite (0001) surfaces

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