CHEM164 Lecture Notes - Lecture 10: Dextrorotation And Levorotation, Stereoisomerism, Stereocenter
28 Feb 2018
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Lecture 10 stereochemistry 3d structures in molecules. Swapping any 2 groups at a chirality center produces the enantiomer. Nonsuperposbale mirror images stereomisomers that are not enantiomers. Each chirality center can exist in two configurations (r/s) The actual number of stereoisomers will be lower than predicted if some have internal plane(s) of symmetry. Molecules can have chirality centers and be achiral overall due to internal symmetry. Meso compounds contain more than one stereocenter and have superposable mirror images. Melting points are different because of the altered packing arrangement. Enantiomers- polarize light same angle but opposite directions. Opitical rotation : the angle that a sample rotates plane-polaized light. Clock wise (>0) dextrorotary (+ or d) Counter clock wise (<0) levorotary (- or l)
