'Substituent effects' diaporamas de présentation

William A. Goddard, III, wag@wag.caltech.edu 316 Beckman Institute, x3093

Lecture 6 January 18, 2012 CC Bonds diamond, ? Hf, Group additivity. Nature of the Chemical Bond with applications to catalysis, materials science, nanotechnology, surface science, bioinorganic chemistry, and energy. Course number: Ch120a Hours: 2-3pm Monday, Wednesday, Friday.

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CH 16: Chemistry of Benzene

CH 16: Chemistry of Benzene. Renee Y. Becker CHM 2211 Valencia Community College. Substitution Reactions of Benzene and Its Derivatives. Benzene does not undergo electrophilic addition It undergoes electrophilic aromatic substitution maintaining the aromatic core

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CH 16: Chemistry of Benzene

CH 16: Chemistry of Benzene. Renee Y. Becker CHM 2211 Valencia Community College. Substitution Reactions of Benzene and Its Derivatives. Benzene does not undergo electrophilic addition It undergoes electrophilic aromatic substitution maintaining the aromatic core

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Bergman Cycloaromatization

Bergman Cycloaromatization. ?. 2 [H ]. Whitney M. Erwin February 21, 2002. Outline. Background Reaction Control - Substituent Effects - Variations - Use of metals - Triggers Applications - Synthesis - Materials Science - Biology IV. Summary. Robert G. Bergman.

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Molecular Spectroscopy Types of transitions:

Molecular Spectroscopy Types of transitions:. 1) Electronic (UV-Vis-Near IR) 2) Vibrational (IR) 3) Rotational (microwave). Electronic Absorption Spectra. p ? p *. Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Prentice Hall, Englewood Cliffs, NJ, 1991.

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Chapter 9

Chapter 9. Second Half. 9.6 Reactions of Aromatic Compounds: Electrophilic Substitution. Electrophilic aromatic substitution electrophile ( E + ) reacts with an aromatic ring and substitutes for one of the hydrogens The most common reaction of aromatic compounds

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Carbenes

Carbenes. Synthesis, Isolation, and Characterization. By Chalmer Wren. What is a Carbene?. Carbenes are a family of organic molecules composed of a neutral divalent carbon atom with a sextet of electrons and two substituents. .

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Carbenes

Carbenes. Synthesis, Isolation, and Characterization. By Chalmer Wren. What is a Carbene?. Carbenes are a family of organic molecules composed of a neutral divalent carbon atom with a sextet of electrons and two substituents. .

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Nucleophilic Neighboring Group Participation

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Chapter 2 Linear Free Energy Relationship and Kinetic Isotope Effect

Chapter 2 Linear Free Energy Relationship and Kinetic Isotope Effect. Substituent Effects. Field effects Inductive effects Resonance effects Polarizability effects Steric effects Solvation effects. Hammett Plots -- a general method for examining changes in charges during a reaction.

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Chapter 2 Linear Free Energy Relationship and Kinetic Isotope Effect

Chapter 2 Linear Free Energy Relationship and Kinetic Isotope Effect. Substituent Effects. Field effects Inductive effects Resonance effects Polarizability effects Steric effects Solvation effects. Hammett Plots -- a general method for examining changes in charges during a reaction.

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How would an electron withdrawing group affect cations ?

How would an electron withdrawing group affect cations ?. Stabilize them Destabilize them No effect Electron donating groups stabilize cations . Which alcohol is more acidic?. a. ethanol b. 1,1,1-trifluoroethanol c. approximately equal.

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Experiment 15:

Experiment 15:. SUBSTITUENT EFFECTS ON THE RATE OF ELECTROPHILIC AROMATIC SUBSTITUTION. Objectives:. To explore how different substituent groups on an aromatic ring affect the rate and orientation of electrophilic aromatic substitution using a qualitative bromine test.

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Quantitative Measurement of Substituent Effects on Chemical Reactivity

Quantitative Measurement of Substituent Effects on Chemical Reactivity.

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Substituted Benzenes

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Rates of Reaction

Rates of Reaction. Rates of electrophilic aromatic substitutions reactions increase with electron donating groups (EDG) on the ring. Rates decrease when electron density is removed from the ring:. E +. Where will the electrophile go?. These rings therefore will react faster. x.

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Abstract

Building a Better Pentacene with Excellent Photooxidative Properties and Thin Film Morphology Brittany Chambers , Jonathan Briggs, Weimin Lin, Glen P. Miller* Department of Chemistry, University of New Hampshire, Durham NH. Abstract

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