Lect22_1012 - Chapter 7 Alkenes and Alkynes I: Properties...

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Ch. 7 - 1 Chapter 7 Chapter 7 Alkenes and Alkynes I: Alkenes and Alkynes I: Properties and Synthesis. Properties and Synthesis. Elimination Reactions Elimination Reactions of Alkyl Halides of Alkyl Halides
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Ch. 7 - 2 1. Introduction Alkenes Hydrocarbons containing C=C Old name: olefins CH 2 OH Vitamin A HO H 3 C H 3 C H H Cholesterol
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Ch. 7 - 3 Alkynes Hydrocarbons containing C C Common name: acetylenes
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Ch. 7 - 4 Cl is cis to CH 3 and trans to Br Difficulties encountered for trisubstituted and tetrasubstituted alkenes 2. The (E) - (Z) System for Designating Alkene Diastereomers
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Ch. 7 - 5 The Cahn-Ingold-Prelog (E) - (Z) Convention The system is based on the atomic number of the attached atom The higher the atomic number, the higher the priority
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Ch. 7 - 6 3. Relative Stabilities of Alkenes Cisand transalkenes do not have the same stability crowding Less stable More stable
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Ch. 7 - 7 Enthalpy +H 2 7 kJ/mol 5 kJ/mol H°= -115 kJ/mol H°= -127 kJ/mol H°= -120 kJ/mol
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Ch. 7 - 8
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This note was uploaded on 02/20/2012 for the course CHEM 333 taught by Professor Lavigne during the Fall '09 term at South Carolina.

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Lect22_1012 - Chapter 7 Alkenes and Alkynes I: Properties...

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