3 many of the best numbers from ken wiberg yale

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3 Many of the best numbers from Ken Wiberg, Yale University who was the first to use computers to automate calorimetry
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4 Alkenes: Molecular Orbitals and Bonding The barrier is high (65 kcal/mol), so alkenes are configurationally stable Geometric Isomerism
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5 Bond Lengths • More s character means shorter C-H length. More bonds means shorter bonds. Nomenclature of Alkenes A Quick Overview Some alkenes, particularly low-molecular-weight ones, are known almost exclusively by their common names CH 2 =CH 2 CH 3 CH=CH 2 CH 3 C=CH 2 CH 3 IUPAC: Isobutylene Propylene Ethylene Common: 2-Methylpropene Propene Ethene
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6 IUPAC Nomenclature of Alkenes 1. Find the longest carbon chain containing the double bond . 2. Enumerate the carbons so that the double bond gets the lowest possible number. 3. Substituents are cited before the parent's longest chain, along with numbers indicating their positions in the chain. Nomenclature of Alkenes 1 2 3 4 5 6 2-hexene 1 2 3 4 2-butene 2-methyl-3-hexene H 3 C CH 3 CH 3 6 5 4 3 2 1 5-methyl-3-heptene CH 3 H 3 C H 3 C H H 7 1 2 3 4 5 6
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7 Degrees of Unsaturation Double bonds and rings take away H 2 in the molecular formula (a saturated hydrocarbon has the formula C n H 2n+2 ) and give the molecule one degree of unsaturation; same with a double bond: C 6 H 12 C 6 H 14 With a molecular formula, you can get the Degree of Unsaturation: All of the following molecules have 0-DUs: OH C 2 H 6 O NH 2 C 2 H 7 N Br C 2 H 5 Br DU = [2 + 2•#C + #N - #H - #halogens] / 2 indicates the number of rings plus number of π bonds
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8 Alkene Isomers: cis and trans Alkene Isomers
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