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Stereoisomerism
Stereoisomerism
24
Biochemistry
Undergraduate 2
02/03/2014

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Term
Isomers
Definition
different chemical compounds with identical molecular formulas
Term
Types of Isomers
Definition
Structural and Stereoisomers
Term
Structural Isomers
Definition
identical molecular formula but different either in the position of a certain substituent or how the same atoms are combined into different functional groups
Term
Stereoisomers
Definition
Both the order in which atoms are joined and the functional groups are identical; all that differs is the three-dimensional spatial arrangement of the atoms
Term
Types of Structural Isomers
Definition
Positional and Functional Group Isomers
Term
Positional Isomers
Definition
Presence of an atom or chemical group at different positions on the carbon chain
Term
Functional-group Isomers
Definition
same molecular formula but different functional groups
Term
Polarized light
Definition
waves vibrate in a single plane
Term
Optically active substances
Definition
rotate the plane of vibration of polarized light
Term
optical activity
Definition
measured by specific rotation
Term
dextrorotatory
Definition
clockwise, +
Term
levorotatory
Definition
counterclockwise, -
Term
Chiral Center
Definition
atom in a molecule that has four different groups attached
Term
Chiral molecule
Definition
molecule not identical with its mirror image, not superimposable on
Term
Enantiomers
Definition
molecules that are nonsuperimposable mirror images of each other
Term
enantiomers
Definition
have identical properties
Term
enantiomers
Definition
rotate plane-polarized light the same number of degrees in opposite directions
Term
racemic mixture
Definition
+ and - in equal emounts
Term
1 chiral center =?
Definition
2 enantiomers
Term
van Hoff's rule
Definition
2^(# of chiral centers)
Term
van Hoff's rule
Definition
maximum number of enantiomers possible
Term
Geometric isomerism
Definition
cis-trans
Term
geometric isomers
Definition
different ocnfigurations because of the presence of a rigid structure in the molecule
Term
diastereoisomers
Definition
stereoisomers that are not enantiomers
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