Nurturing Life Sciences
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#Id: 7841
#Unit 1. Molecules and their Interaction Relevant to Biology
Isomers that have opposite configurations at one or more of the chiral centers but that are not mirror images of each other are called diastereomers
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Two sugars that differ in configuration at only one chiral center are described as epimers.
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d-mannose and d-talose are epimers and d-glucose and d-mannose are epimers, whereas d-glucose and d-talose are not epimers but merely diastereomers
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When the anomeric hydroxyl of a D-hexose is on the same side of the ring as C-6, the structure is β a by definition; when it is on the opposite side from C-6, the structure is α.