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Carbon-Centered Free Radicals and Radical Cations: Structure, Reactivity, and Dynamics

ISBN: 978-0-470-39009-2
370 pages
February 2010
Carbon-Centered Free Radicals and Radical Cations: Structure, Reactivity, and Dynamics (0470390093) cover image

Covers the most advanced computational and experimental methods for studying carbon-centered radical intermediates

With its focus on the chemistry of carbon-centered radicals and radical cations, this book helps readers fully exploit the synthetic utility of these intermediates in order to prepare fine chemicals and pharmaceutical products. Moreover, it helps readers better understand their role in complex atmospheric reactions and biological systems. Thoroughly up to date, the book highlights the most advanced computational and experimental methods available for studying and using these critically important intermediates.

Carbon-Centered Free Radicals and Radical Cations begins with a short history of the field of free radical chemistry, and then covers:

  • A discussion of the relevant theory

  • Mechanistic chemistry, with an emphasis on synthetic utility

  • Molecular structure and mechanism, focusing on computational methods

  • Spectroscopic investigations of radical structure and kinetics, including demonstrations of spin chemistry techniques such as CIDNP and magnetic field effects

  • Free radical chemistry in macromolecules

Each chapter, written by one or more leading experts, explains difficult concepts clearly and concisely, with references to facilitate further investigation of individual topics. The authors were selected in order to provide insight into a broad range of topics, including small molecule synthesis, polymer degradation, computational chemistry as well as highly detailed experimental work in the solid, liquid, and gaseous states.

This volume is essential for students or researchers interested in building their understanding of the role of carbon-centered radical intermediates in complex systems and how they may be used to develop a broad range of useful products.

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About the Volume Editor.

Preface to Series.

Introduction.

Contributors.

1. A Brief History of Carbon Radicals (Malcolm D. E. Forbes).

2. Intermolecular Radical Additions to Alkynes: Cascade-Type Radical Cyclizations (Uta Wille).

2.1 Introduction.

2.2 Cascade Reactions Involving Radicals of Second Row Elements.

2.3 Cascade Reactions Initiated by Addition of Higher Main Group (VI)-Centered Radicals to Alkynes.

2.4 Cascade Reactions Initiated by Addition of Higher Main Group (VI)-Centered Radicals to Alkynes.

2.5 Cascade Reactions Initiated by Addition of Higher Main Group (V)-Centered Radicals to Alkynes.

3. Radical Cation Fragmentation Reactions in Organic Synthesis (Alexander J. Poniatowski and Paul E. Floreancig).

3.1 Introduction.

3.2 Electron Transfer-Initiated Cyclization Reactions.

3.3 Oxidative Acyliminium Ion Formation.

3.4 Carbon–Carbon Bond Formation.

3.5 Summary and Outlook.

4. Selectivity in Radical Cation Cycloadditions (Christo S. Sevov and Olaf Wiest).

4.1 Introduction.

4.2 Mechanism and the Origin of the Rate Acceleration.

4.3 Selectivity in Radical Cation Cycloadditions.

4.4 Chemoselectivity.

4.5 Regioselectivity.

4.6 Periselectivity.

4.7 Endo/Exo Selectivity.

4.8 Conclusions.

5. The Stability of Carbon-Centered Radicals (Michelle L. Coote, Ching Yeh Lin, and Hendrik Zipse).

5.1 Introduction.

5.2 Theoretical Methods.

5.3 RSE Values for Carbon-Centered Radicals.

5.4 Use of RSE Values in Practical Applications.

5.5 Conclusions.

6. Interplay of Stereoelectronic Vibrational and Environmental Effects in Tuning Physicochemical Properties of Carbon-Centered Radicals (Vincenzo Barone, Malgorzata Biczysko, and Paola Cimino).

6.1 Introduction.

6.2 EPR Spectroscopy.

6.3 Calculation of EPR Parameters.

6.4 Vibrational Properties Beyond the Harmonic Approximation.

6.5 Electronic Properties: Vertical Excitation Energies, Structure, and Frequencies in Excited Electronic States.

6.6 Vibronic Spectra.

6.7 Concluding Remarks.

7. Unusual Structures of Radical Ions in Carbon Skeletons: Nonstandard Chemical Bonding by Restricting Geometries (Georg Gescheidt).

7.1 Introduction.

7.2 The Tools.

7.3 Pagodane and Its Derivatives.

7.4 Different Stages of Cycloaddition/Cycloreversion Reactions Within Confined Environments.

7.5 Extending the ‘‘Cage Concept’’.

7.6 Summary.

8. Magnetic Field Effects on Radical Pairs in Homogeneous Solution (Jonathan. R. Woodward).

8.1 Introduction.

8.2 The Spin-Correlated Radical Pair.

8.3 Application of a Magnetic Field.

8.4 Spin-State Mixing.

8.5 The Magnetic Field Dependence of Radical Pair Reactions.

8.6 Theoretical Approaches.

8.7 Experimental Approaches.

8.8 The Life Cycle of Radical Pairs in Homogeneous Solution.

8.9 Summary.

9. Chemical Transformations Within the Paramagnetic World Investigated by Photo-CIDNP (Martin Goez).

9.1 Introduction.

9.2 CIDNP Theory.

9.3 Experimental Methods.

9.4 Radical—Radical Transformations During Diffusive Excursions.

9.5 Radical—Radical Transformations at Reencounters.

9.6 Interconversions of Biradicals.

9.7 Conclusions.

10. Spin Relaxation in Ru-Chromophore-Linked Azine/Diquat Radical Pairs (Matthew T. Rawls, Ilya Kuprov, C. Michael Elliott, and Ulrich E. Steiner).

10.1 Introduction.

10.2 EPR for the Isolated Ions.

10.3 Calculation Methods for EPR of the Isolated Ions.

10.4 Implications for Spin-Relaxation in Linked Radical Pairs.

11. Reaction Dynamics of Carbon-Centered Radicals in Extreme Environments Studied by the Crossed Molecular Beam Technique (Ralf I. Kaiser).

11.1 Introduction.

11.2 The Crossed Molecular Beam Method.

11.3 Experimental Setup.

11.4 Crossed Beam Studies.

11.5 Conclusions.

12. Laser Flash Photolysis of Photoinitiators: ESR, Optical, and IR Spectroscopy Detection of Transients (Igor V. Khudyakov and Nicholas J. Turro).

12.1 Introduction.

12.2 Photodissociation of Initiators.

12.3 TR ESR Detection of Transients.

12.4 Optical Detection of Transients.

12.5 IR Detection of Free Radicals and Monitoring Their Reactions.

12.6 Concluding Remarks.

13. Dynamics of Radical Pair Processes in Bulk Polymers (Carlos A. Chesta and Richard G. Weiss).

13.1 Introduction.

13.2 Singlet-State Radical Pairs from Irradiation of Aryl Esters and Alkyl Aryl Ethers.

13.2.1 General Mechanistic Considerations From Solution and Gas-Phase Studies.

13.3 Photo-Reactions of Aryl Esters in Polymer Matrices. Kinetic Information from Constant Intensity Irradiations.

13.4 Rate Information from Constant Intensity Irradiation of Alkyl Aryl Ethers.

13.5 Comparison of Calculated Rates to Other Methods for Polyethylene Films.

13.6 Triplet-State Radical Pairs.

13.7 Concluding Remarks.

14. Acrylic Polymer Radicals: Structural Characterization and Dynamics (Malcolm D. E. Forbes and Natalia V. Lebedeva).

14.1 Introduction.

14.2 The Photodegradation Mechanism.

14.3 Polymer Structures.

14.4 The Time-Resolved EPR Experiment.

14.5 Tacticity and Temperature Dependence of Acrylate Radicals.

14.6 Structural Dependence.

14.7 Oxo-Acyl Radicals.

14.8 Spin Polarization Mechanisms.

14.9 Solvent Effects.

14.10 Dynamic Effects.

14.11 Conclusions.

Index.

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MALCOLM D. E. FORBES, PhD, is Professor of Chemistry at the University of North Carolina at Chapel Hill, where he has served in various capacities since 1990. Professor Forbes's group is involved in free radical research and electron paramagnetic resonance spectroscopy. He is a renowned educator and lecturer and has received numerous awards for his research and teaching methods, including the Sir Harold Thomson Award from Elsevier, a Japan Society for the Promotion of Science Foreign Fellowship Award, a National Science Foundation Young Investigator Award, and the Bernard Smaller Prize for Research in Magnetic Resonance. In 2008, he was a J. W. Fulbright Senior Scholar, living and working in Novosibirsk, Russia.

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"Overall this volume is relevant to both students and accomplished researchers alike and is highly recommended. The price is certainly affordable." (Journal of the American Chemical Society, November 2010)

 

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