Free_radical_mechanism

Free_radical_mechanism - Example: + Cl 2 h ! alkane halogen...

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Spring 2007 CHM 201 RECOGNIZING ORGANIC REACTIONS/MECHANISMS Free-Radical Reactions: Substitution Reactions How to predict products General Formula: alkane + halogen h ! alkyl halide + acid *Anywhere a hydrogen resided in the alkane will be replaced by a halogen to form an alkyl halide in the product!!! Example: + Cl 2 h ! alkane halogen alkyl halides + HCl acid H H H H + H H Cl H H H H Cl
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Spring 2007 CHM 201 RECOGNIZING ORGANIC REACTIONS/MECHANISMS How to recognize the mechanism: alkane + halogen h ! alkyl halide + acid if you see this, it will be a free radical mechanism
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Unformatted text preview: Example: + Cl 2 h ! alkane halogen alkyl halides + HCl acid + Cl Cl The Complete Mechanism: First step of mechanism: I n i t i a t i o n Cl Cl 2 Cl Second step of mechanism: P r o p a g a t i o n H H H Cl H H + HCl Cl Cl H H Cl + Cl First Propagation step for the formation of the first product: Notice HALF-arrow heads being used!!! Only seen in FREE-RADICAL mechanisms!!!! Now your turn! Write the mechanism for the second propagation to form the second product of the example above. Second Propagation:...
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Free_radical_mechanism - Example: + Cl 2 h ! alkane halogen...

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