chirality A

What is a constitutional isomer?
An isomer with different connectivity
What is a stereoisomer?
An isomer with teh same connectivity
A stereoisomer without a stereocenter is called?
Achiral
An Achiral isomer, can have what?
CIS-trans isomers
What isomers are associated with chiral centers?
enantiomers and diastereomers
Two molecules with non-superimposible mirror images are called?
Enantiomers
What is a stereogenic center?
chiral center with 4 different groups or elements attached
What is a property of an object and an image that ARE superimposable?
Identical and NO chirality
What are the properties of ENANTIOMERS?
Mirror images
Non Identical
Non Superimposale
Enantio= opposite
Mirror imate at ALL chiral carbons
What is a DIASTEREOMER?
Not a mirror image at all chiral carbons
How many enantiomers are there for “n” chiral carbons?
2^n
What properties are the same for ENANTIOMERS?
Physical properties
Chemical properties
What is unique about ENANTIOMERS?
Interact differently with plane-polarized light-Optical activity
Why is it important in biochemistry to deal with enantiomers?
Reactions are selective for a particular enantiomer
How does the light rotate?
L= – counterclockwise
D=+ clockwise
What is Dextrorotary
Clockwise rotation of the plane of plane-polarized light
What is Levorotatory?
Counterclockwise rotation fo the plane of plane polarized light
How do you do the RS system?
1. Arrange in order of atomic number priority from 1-highest to 4 lowest
2.Orient molecule so group of lowest priority is away from you.
3. Read the three groups projecting toward you from highest1 to lowest 3 priority
If 1,2,3 is clockwise then config is “R” (opposite is S)
What is an equimolar mixture of ENANTIOMER?
Racemic- does not bend polarized light
What are Diastereomers?
Non mirror image at ALL chiral carbons
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