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4-AlkenesHLSF07

4-AlkenesHLSF07 - Inductive Effect Chapter 4 Alkenes Holly...

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Inductive Effect
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Chapter 4: Alkenes Holly Sebahar Duke University 2007
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Ethene = Ethylene C C H H H H Smith, J. Organic Chemistry , 1st Ed.
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Sp 2 -Hybridization - Trigonal Planar Geometry 1/3 s 2/3 p 33% s character
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Structure of Ethene
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Intro to Nomenclature and Degrees of Unsaturation Degrees of Unsaturation = unsaturation number = number of rings + pi bonds Compare the actual number of H to total possible in saturated molecule. pentane H 3 CHC CHCH 2 CH 3 CH 3 CH 2 CCH 2 CH 2 CH 3 CH 2 C 4 H 6
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CH 2 Methylene Group CH 2
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Rotation around C-C double bond restricted.
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Π -bond can be broken with light or heat (energy!)
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H Br Cl H Cis or Trans? Cycloalkenes and the 8 carbon rule
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E, Z - Nomenclature Rules for assigning E/Z Stereochemistry: 1. Look at the atoms attached directly to the double bond and assign higher priority to: Atom with highest atomic number (C > H or Br > Cl) Isotope with higher atomic mass (T > D > H) 2. If the atoms are identical then compare attached atoms.
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