CHAPTER 21-23

CHAPTER 21-23 - CHAPTER 21 The Chemistry of Radicals 21.1...

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CHAPTER 21 – The Chemistry of Radicals 21.1 – Radicals Homolytic Bond CleavageX Y X + Y 21.2 – Stability of Radicals Radicals are unstable & reactive Slower Rxn, Less Stable: Methyl < 1 o < 2 o < 3 o < Allylic < Benzylic :Most Stable, Faster Rxn 21.3 – Geometry of Carbon Radicals R C R R R C R R R R R A trigonal planar radical A rapidly inverting pyrimidal radical 21.4 – Generation of Radicals Can either be generated with heat (Δ) or ultraviolet or visible light ( hv or uv ). Peroxide Azo AIBN 21.5 – General Radical Reactions Coupling CH 3 CH 3 H 3 C CH 3 Abstracting CH 2 CH 3 H 3 C H CH 3 H 3 C CH 3 21.6 – Halogenation Induced by light
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NBS O O N Br CHAPTER 22 – Pericyclic Reactions 22.6 – Diels-Alder Reaction or + CHAPTER 23 – The Synthesis of Organic Compounds 23.1 – Protecting Groups for Alcohols 23.2 – Protecting Groups for Aldehydes & Ketones 23.5 – Retrosynthetic Analysis
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This note was uploaded on 05/04/2008 for the course CHM 228 taught by Professor Rosen during the Spring '08 term at Rhode Island.

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CHAPTER 21-23 - CHAPTER 21 The Chemistry of Radicals 21.1...

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