{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

3 many of the best numbers from ken wiberg yale

Info iconThis preview shows pages 3–9. Sign up to view the full content.

View Full Document Right Arrow Icon
3 Many of the best numbers from Ken Wiberg, Yale University who was the first to use computers to automate calorimetry
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Alkenes: Molecular Orbitals and Bonding The barrier is high (65 kcal/mol), so alkenes are configurationally stable Geometric Isomerism
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 6
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
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
8 Alkene Isomers: cis and trans Alkene Isomers
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}