Radical halogenation - Alkyl Free Radicals They are...

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1 Radical Halogenation of Alkanes Alkyl Free Radicals • They are 7-electron neutral reactive intermediates. • Alkyl free radicals are thought to be mostly planar although there is some disagreement about this. • The more highly substituted the more stable the radical (3°>2 °>1 °>methyl). • It is easy to see stability in terms of bond dissociation energies (BDEs). • Why? BDEs represent homolytic cleavage of the C-H bond, as the stability of the neutral radical increases, the BDE gets smaller. Fig. 4.17 Two possible structures for the carbon radical Fig. 4.18 Delocalization of electron density: Methyl vs. Ethyl
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2 Chlorination of Methane •I n i t i a t i o n • Propagation •T e
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This note was uploaded on 03/24/2009 for the course CHEMISTRY 030.205 taught by Professor Greenberg during the Fall '08 term at Johns Hopkins.

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Radical halogenation - Alkyl Free Radicals They are...

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