CHEM 211 Chapter Notes - Chapter 4.11-4.13: Stereoisomerism, Substituent, Cyclohexane Conformation
19 Oct 2016
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Document Summary
Chair conformation = the most table conformation of cyclohexane: no angle or torsional strain when it"s in this conformation. Bonds are perfectly staggered, and hydrogens are maximally separated. Boat conformation = another conformation cyclohexane can be found in: does not have angle strain, but does have torsional strain in the conformation. Torsional strain can be seen when you look down the carbon-carbon bonds. The boat conformation is more exible, while the chair conformation is more rigid. Half chair conformation = half chair conformation, and half just ring. Most stable to most unstable conformation is chair twist boat half-chair: 99% of the time, molecules are found in the chair conformation because it is the most stable. Conformations of higher cycloalkanes: cycloheptane and beyond are found in non-planar conformations. They are essentially free of angle strain, but have torsional and repulsive dispersion forces between hydrogens (transannular strain) The more carbons, the more the angle strain grows.
