Chem357_Alkyl_halides__FINAL_Student_

Chem357_Alkyl_halides__FINAL_Student_ - 1 Radical Reactions...

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Unformatted text preview: 1 Radical Reactions of Radical Reactions of Alkanes Alkanes Paula Y. Paula Y. Bruice Bruice , , Chapter 11 Chapter 11 2 Halogenation Halogenation of of Alkanes Alkanes CH 4 CH 3 CH 3 CH 3 Cl CH 3 CH 2 Br o r h ! o r h ! irradiation with light With the exception of combustion, alkanes are relatively unreactive. However, if alkanes undergo halogenation reactions with Cl 2 and Br 2 as follows: HEAT Mechanism? 3 Cl Cl o r h ! 2 Cl Cl H CH 3 HCl + CH 3 CH 3 Cl Cl CH 3 Cl + Cl initiation step propagation steps Cl Cl Cl 2 CH 3 CH 3 CH 3 CH 3 CH 3 Cl CH 3 Cl termination steps Free Radical Mechanisms can be broken down into 3 phases or steps Halogenation Halogenation of of Alkanes Alkanes - Free Radical Mechanism- Free Radical Mechanism 4 Cl CH 3 CH 2 CH 2 CH 3 o r h ! CH 3 CH 2 CHCH 3 CH 3 CH 2 CH 2 CH 2 Cl Cl + Consider the following reaction... Based on statistics, what would expect the product ratio to be? Why? CH 3 CH 2 CHCH 3 H CH 3 CH 2 CH 2 CH 2 H Halogenation Halogenation of of Alkanes Alkanes - Free Radical Mechanism- Free Radical Mechanism 5 Halogenation...
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Chem357_Alkyl_halides__FINAL_Student_ - 1 Radical Reactions...

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