Stereochemistry — definition?
Study of molecules with same atoms, different 3D arrangements.
Chirality — property?
Non-superimposable on mirror image, usually with a stereocenter.
Achiral molecules — example?
Superimposable mirror images, symmetrical structures.
Enantiomers — difference?
Mirror-image stereoisomers, rotate plane-polarized light oppositely.
Diastereomers — difference?
Non-mirror stereoisomers, differ at some but not all chiral centers.
Chiral center — identification?
Carbon bonded to four different groups.
R/S configuration — process?
Prioritize substituents, trace sequence, assign R or S.
Optical activity — effect?
Rotates plane-polarized light; enantiomers rotate oppositely.
Enantiomers — physical properties?
Identical except for optical rotation and chiral interactions.
Epimers — difference?
Differ at only one chiral carbon, excluding anomeric carbon.
Anomers — formation?
Formed during sugar cyclization, differ at anomeric carbon.
α-anomer — hydroxyl position?
Trans to CH₂OH group in cyclic sugar.
β-anomer — hydroxyl position?
Cis to CH₂OH group in cyclic sugar.
Biological chirality — significance?
Enzymes recognize specific enantiomers, affecting activity.
Drug enantiomers — effect?
One active, other inactive or harmful; stereospecificity critical.
Chirality in flavors — example?
(R)-limonene smells like orange; (S)-limonene like lemon.
Determining R/S — key step?
Prioritize groups, trace sequence, flip if lowest in front.
Chirality — importance?
Affects biological activity, drug efficacy, and sensory properties.
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1. What does chirality refer to in stereochemistry?
2. Who is the author associated with the introduction to stereochemistry in the course content?
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