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Unformatted text preview: Assume that the absolute energy associated with the reactants is 0 kcal/mol. In your reaction energy diagram, label the positions of the reactants (as R ), the products (as P ), and the transition state ( ). Also label H in your diagram. Three possible structures of the transition state are shown to the right of the reaction energy diagram template. Circle the structure which best represents the transition state, based on your estimate of H and Hammonds postulate. A dotted line represents a partial bond. Energy (kcal/mol) Reaction Progress +20 20 40 HO C Br H H H H C H H Br HO C HO H H H Br Bond broken = H 3 CBr (BDE = 72 kcal/mol) Bond formed = H 3 COH (BDE = 92 kcal/mol) 20 R P H According to Hammonds postulate, the transition state for an exothermic reaction step resembles reactants more than products....
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This note was uploaded on 04/12/2009 for the course CH 53170 taught by Professor Bocknack during the Spring '09 term at University of Texas at Austin.
- Spring '09
- Organic chemistry