Chapter 3: Alkenes and Alkynes 1. Hydrogenation of Alkenes and Alkynes Hydrocarbons that have...
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Transcript of Chapter 3: Alkenes and Alkynes 1. Hydrogenation of Alkenes and Alkynes Hydrocarbons that have...
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Chapter 3: Alkenes and Alkynes
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Hydrogenation of Alkenes and AlkynesHydrocarbons that have carbon-carbon double bond are called alkenes; those with a carbon-carbon triple bond are alkynes
Their general formulas are CnH2n alkenes and CnH2n-2 alkynes
Both alkenes and alkynes are unsaturated hydrocarbons
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Compounds with more than one double or triple bonds exist. Multiple double bonds may lead to dienes, trienes, tetraenes and polyenes. β-carotene and lycopene are examples of polyenes
When two or more multiple bonds re present in a molecule, they can be classified depending on the relative positions of the bonds
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Which of the following compounds have conjugated multiple bonds?
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Nomenclature
1. The ending –ene is used to designate carbon-carbon double bond. When more than one double bond is present, the ending is –diene, triene, tetraene and so on. The ending –yne is used for triple carbon-carbon bond.
2. Select the longest chain that includes both carbons of the double bond or triple bond.
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Number the chain from the end nearest the multiple bond so that the carbon atoms in that bond have the lowest possible numbers.
If the multiple bond is equidistant from both ends of the chain, number the chain from the end nearest the first branch point.
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Indicate the position of the multiple bond using the lower numbered carbon atom of that bond.
If more than one multiple bond is present, number the chain from the end nearest the first multiple bond.
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If the double bond and the triple bond are equidistant from the end of the chain, the double bond receives the lowest number.
The root name is from the longest carbon chain containing the multiple bond
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The numbering rules applied
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With the cyclic hydrocarbons, we start numbering the ring with the carbons of the multiple bond.
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Write the structural formula for
3-methyl-2-pentene
1,4-dichloro-2-pentene
3-hexyne
1,2-dimethylcyclobutene
2-bromo-1,3-pentadiene
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Some Common names
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Some Facts about Double Bonds
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The Orbital Model of a Double Bond; the pi Bond
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Cis-Trans Isomerism in Alkenes
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The Chemistry of Vision
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Are cis-trans isomers possible for 1-butene and 2-butene?
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Geometric isomers of alkenes can be interconverted if sufficient energy is supplied to break the pi bond and allow rotation about the remaining sigma bond.
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Addition and Substitution Reactions Compared
Addition of halogens X2
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Addition of Water (Hydration)
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Addition of Acids
Acids that add this way are the hydrogen halides (H-F, H-Cl, H-Br, H-I) and sulfuric acid (H-OSO3H)
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Write the equation for each of the following reactions
a)2-butene + HCl
b)3-Hexene + HI
a)4-methylcyclopentene + HBr
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Addition of Unsymmetric Reagents to Unsymmetric Alkenes; Markovnikov’s Rule
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Mechanism of Electrophilic Addition to Alkenes
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Markovnokov’s Rule Explained
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Reaction Equilibrium
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Hydroboration of Alkenes
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What alkene is needed to obtain he alcohol below via hydroboration-oxidation sequence, what product would this alkene give with acid-catalyzed hydration.
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Addition of Hydrogen
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Addition to Conjugated Systems
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Cycloaddition to Conjugated Dienes: Diels-Alder Reaction
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Free-Radical Additions; Polyethene
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Oxidation with permanganate; a Chemical Test
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Ozonolysis of Alkenes
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Other Alkene Oxidations
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REACTIONS SUMMARY
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