CHEM 2443 Chapter Notes - Chapter 9: Enantiomeric Excess, Absolute Configuration, Stereochemistry
Document Summary
Fischer projections (lecture 70) w8 3/11/16 f. Vertical lines going back away from you. Horizontal lines going out toward you. A molecular model 4d is shown to give a 3d view of 4c. Fischer projections of a stereogenic center may be convenient because simply switching any 2 groups on the horizontal line or the vertical line generates the enantiomer of 4c. This may be a convenient method to generate and evaluate two structures for superimposability. Specific rotation (lecture 71) w9 3/21/16 m. Polarimeter: there is one physical property in which enantiomers differ; they differ in their interaction with polarized light, which is filtered so all the light is in a single plane. Plane polarized light: one enantiomer will rotate the plane of light counterclockwise, one enantiomer will rotate the plane of light clockwise. The rotation of the plane-polarized light (clockwise/counterclockwise) is the only physical property in which 2 enantiomers are different.
