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160 Chapter 4
Copyright © 2017 Pearson Education, Inc.
receptor
a protein that binds a particular molecule.
resolution of a racemic
separation of a racemic mixture into the individual enantiomers.
mixture
S
configuration
after assigning relative priorities to the four groups bonded to an asymmetric cen-
ter, if the lowest priority group is on a vertical axis in a Fischer projection (or
pointing away from the viewer in a perspective formula), the arrow drawn from the
highest priority group to the next highest priority group and then to the next high-
est priority group is counterclockwise.
specific rotation
the amount of rotation that will be observed for a compound with a concentration
given in grams per 100 mL of solution (or g/mL if it is a pure liquid) in a sample
tube 1.0 dm long.
stereocenter
an atom at which the interchange of two groups produces a stereoisomer.
(stereogenic center)
stereoisomers
isomers that differ in the way the atoms are arranged in space.
threo enantiomers
the pair of enantiomers with similar groups on two asymmetric centers on opposite
sides when drawn in a Fischer projection.
trans isomer
the isomer with substituents on the opposite sides of a cyclic structure, or the iso-
mer with the hydrogens on the opposite sides of a double bond.
Z
isomer
the isomer with the high-priority groups on the same side of the double bond.