BCH101intermediate
Distinguish epimers, anomers, and enantiomers, and provide one relevant carbohydrate example for each.
Answer
Epimers differ at exactly one chiral center, such as glucose and mannose at carbon 2. Anomers differ at the anomeric carbon formed during ring closure, such as alpha and beta forms of a sugar. Enantiomers are non-superimposable mirror images, such as D- and L-glyceraldehyde.
Explanation
### What a good answer covers
- **Epimers** differ at one chiral center but are not necessarily mirror images.
- **Anomers** are a special kind of stereoisomer that differ at the anomeric carbon.
- **Enantiomers** are mirror-image stereoisomers that cannot be superimposed.
- Examples include glucose and mannose, alpha and beta sugar forms, and D- and L-glyceraldehyde, respectively.
### The concept
These terms describe different relationships between molecules with the same connectivity. The location and number of changed stereocenters determine the category. Anomeric forms arise when a sugar’s carbonyl reacts within the molecule to form a ring.
### Terms
- **Anomeric carbon**: the former carbonyl carbon that becomes a new stereocenter when a sugar cyclizes.
- **Stereoisomer**: a molecule with the same connectivity as another but a different three-dimensional arrangement.
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