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chapter3 - 3 Organic Compounds Alkanes and Their...

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3. Organic Compounds: Alkanes and Their Stereochemistry Based on McMurry’s Organic Chemistry , 7 th edition
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2 Class Business Items Exam Schedule –Still working on this one. Poll class on exam dates. September 27 th , Thursday, 7:30 pm October 4 th , Thursday, 7:30 pm Organic Lab – Prelab Assignment – Mechanism No. of Students taking CHGN223 (organic lab I) spring of 2008? Quiz Policy No late quizzes I will drop two lowest quiz scores All missed quizzes receive a zero
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3 Why this Chapter Alkanes are unreactive (???) , but provide useful vehicle to introduce important ideas about organic compounds What is an alkane? (C n H 2n+2 ) Examples Alkanes will be used to discuss basic approaches to naming organic compounds We will take an initial look at 3-D aspects of molecules I think a better statement would be that alkanes are much less reactive, but they do undergo important reactions, such as free radical oxidation and chlorination. Oxidation reactions occur at higher temperatures. What about alkanes would make them so slow to react?
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4 3.1 Functional Groups Functional group - collection of atoms at a site that have a characteristic behavior in all molecules where it occurs The group reacts in a typical way, generally independent of the rest of the molecule For example, the double bonds in simple and complex alkenes react with bromine in the same way
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5 Functional Groups with Multiple Carbon–Carbon Bonds Alkenes have a carbon-carbon double (C=C) bond Alkynes have a C C triple bond Arenes have special bonds that are represented as alternating single (C-C) and double (C=C) bonds in a six-membered ring
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6 Functional Groups with Carbon Singly Bonded to an Electronegative Atom RX or RCl or RBr ROH ROR’ ROPO 3 -2
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7 Groups with a Carbon–Oxygen Double Bond (Carbonyl Groups) RCHO RCOR’ RCO 2 H RCO 2 R’
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8 Survey of Functional Groups methoxymethane - IUPAC -ene ?? only has prefix name hydroxy as prefix name alkoxy as prefix name
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9 Survey of Functional Groups
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10 Functional Groups
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11 Functional Groups
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12 3.2 Alkanes and Alkane Isomers Alkanes: Compounds with C-C single bonds and C-H bonds only (no functional groups and no π -bonds ) Connecting carbons can lead to large or small molecules The formula for an alkane with no rings in it must be C n H 2n+2 where the number of C’s is n Alkanes are saturated with hydrogen (no more can be added They are also called aliphatic compounds Must know names for C 1 to C 10 (methane to decane) pentane (C 5 ), hexane, (C 6 ) heptane (C 7 ), octane (C 8 ), nonane C( 9 ), decane (C 10 )
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chapter3 - 3 Organic Compounds Alkanes and Their...

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