lecture 10 - Organic Lecture Series CH 310/318 M LECTURE 10...

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Organic Lecture Series 1 CH 310/318 M LECTURE 10 Textbook Assignment: Chap. 6- Reactions of Alkenes Today’s Topics: Overview & Intro to Mechanisms Overview & Intro to Mechanisms Notice & Announcements: Exam1: Papers pick up after class (HW 3 Posted) Organic Lecture Series 2 Reactions Reactions of Alkenes of Alkenes Chapter 6 Chapter 6
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Organic Lecture Series 3 CC B r 2 (HX) HCl H 2 O (X 2 ) B r 2 2 ) H 2 O (X) H OH Br Br( X) HO C C H Cl(X) Descriptive Name(s ) Reaction + + + Bromination (halogenation) Hydrochlorination (hydrohalogenation) Hydration + Halohydrin formation (Bromohydrin formation) Characteristic Reactions Characteristic Reactions Organic Lecture Series 4 C C C C BH 3 OsO 4 H 2 Hg(OAc) 2 H 2 O 2 H C C H H HgOAc + + + Hydroboration Diol formation (oxidation) Hydrogenation (reduction) + Oxymercuration Characteristic Reactions Characteristic Reactions
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Organic Lecture Series 5 • A reaction mechanism describes how a reaction occurs and explains the following. ¾ Which bonds are broken and which new ones are formed. ¾ The order and relative rates of the various bond-breaking and bond-forming steps. ¾ If in solution, the role of the solvent. ¾ If there is a catalyst, the role of a catalyst. ¾ The position of all atoms and energy of the entire system during the reaction. Reactions Mechanisms Reactions Mechanisms Organic Lecture Series 6 • Gibbs free energy change, Gibbs free energy change, Δ G 0 : – A thermodynamic function relating enthalpy, entropy, and temperature. – Exergonic Exergonic reaction: reaction: A reaction in which the Gibbs free energy of the products is lower than that of the reactants; the position of equilibrium for an exergonic reaction favors products . – Endergonic Endergonic reaction: reaction: A reaction in which the Gibbs free energy of the products is higher than that of the reactants; the position of equilibrium for an endergonic reaction favors starting materials. Δ G 0 = Δ H 0 –T Δ S 0 Gibbs Free Energy Gibbs Free Energy
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Organic Lecture Series 7 • Enthalpy change, Enthalpy change, ΔΗ ΔΗ 0 : : The difference in total bond energy between reactants and products. – a measure of bond making (exothermic) and bond breaking (endothermic).
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This note was uploaded on 10/20/2011 for the course CH 310 M taught by Professor Iverson during the Fall '09 term at University of Texas at Austin.

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lecture 10 - Organic Lecture Series CH 310/318 M LECTURE 10...

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