CHEM266 Study Guide - Midterm Guide: Enantiomer, Structural Isomer, Diastereomer
20 Oct 2017
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Priorities are assigned based on: atom (bigger/more en, bigger groups. Remember to put the h group to the back before assigning priorities. Assigned number (in iupac naming) is the lower one (ie 2-3 double bond known as 2z/2e) E = trans = higher priority groups on opposite sides of the double bond. Z = cis = higher priority groups on same sides of the double bond. Isomer = same molecular formula, different compound: structural isomer = different connectivity, stereoisomer = different group arrangement, enantiomer = mirror images, not superimposable, diastereomer = not enantiomers, geometric isomer = different spatial arrangement (cis/trans) Protic = nh or oh bonds (can hbond with itself: aprotic = no nh or oh bonds, cannot hbond with itself. Anti/gauche conformations: anti = most stable conformation, largest groups are parallel from each other, gauche = 2 carbons at 60 degree angle to each other, most obvious when the molecule is drawn in newman projection.
