Lecture24Final(10)

Lecture24Final(10) - Organic Chemistry, Third Edition...

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1 Organic Chemistry, Third Edition Janice Gorzynski Smith University of Hawai’i Chapter 10 Alkenes
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2 Alkenes can be prepared from alkyl halides via elimination reactions. Mostly E2 conditions Preparation of Alkenes
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3 The typical reactions of alkenes are additions; the ! bond is broken and two new " bonds are formed. Alkenes are electron rich; electron density of the ! bond concentrated above and below the plane of the molecule. Alkenes act as nucleophiles and react with electrophiles . Simple alkenes do not react with nucleophiles. Addition Reactions
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4 Syn addition takes place when both X and Y are added from the same side. Anti addition takes place when X and Y are added from opposite sides. Syn and Anti Addition to Alkenes
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5 Addition Reactions of Cyclohexene Figure 10.8
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6 Two bonds are broken, the weak ! bond of the alkene and the H–X bond and two new " bonds are formed, one to H and one to X. The H–X bond is polarized, with a partial positive charge on H. The electrophilic H # + end of HX is attracted to the electron-rich double bond. Hydrohalogenation – Electrophilic Addition of HX
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7 How to Draw the Products of an Addition Reaction Locate the C=C. Identify the
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This note was uploaded on 01/03/2012 for the course CHEM 233 taught by Professor Anamoore during the Fall '10 term at ASU.

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Lecture24Final(10) - Organic Chemistry, Third Edition...

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