lecture 19 (ch 8) - Organic Lecture Series CH 310/318 M...

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Organic Lecture Series 1 CH 310/318 M LECTURE 19 Textbook Assignment: Chapter 8- Cont’d Today’s Topics: The Hammond Postulate; The Hammond Postulate; allylic allylic bromination bromination ; radical addition of ; radical addition of HBr HBr to alkenes to alkenes Notice & Announcements: Exam II: Key posted to WEB site Organic Lecture Series 2 Haloalkanes Haloalkanes Chapter 8 Chapter 8
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Organic Lecture Series 3 • Hammond Hammond ’s Postulate: s Postulate: The structure of the transition state: –for an exothermic step is reached relatively early in the reaction, and resembles the reactants of that step more than the products. endothermic step is reached relatively late in the reaction and resembles the products of that step more than the reactants. Hammond Hammond ’s Postulate s Postulate Organic Lecture Series 4 • Hammond Hammond ’s Postulate: s Postulate: This postulate applies equally well to the transition state for one-step reactions and to each transition state in a multi-step reaction. Hammond Hammond ’s Postulate s Postulate
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Organic Lecture Series 5 A highly exothermic reaction: Hammond Hammond ’s Postulate s Postulate (chlorination) (chlorination) Organic Lecture Series 6 Transition state Transition state “looks looks ” more the alkane (sp more the alkane (sp 3 hybridized C) hybridized C)
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Organic Lecture Series 7 (chlorination) (chlorination) Organic Lecture Series 8 A highly endothermic reaction: Hammond Hammond ’s Postulate s Postulate (bromination bromination )
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Organic Lecture Series 9 3 3 H
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This note was uploaded on 03/20/2011 for the course CHEMISTRY 310m taught by Professor Iverson during the Fall '08 term at University of Texas at Austin.

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lecture 19 (ch 8) - Organic Lecture Series CH 310/318 M...

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