Alpha-mannopyranose and beta-mannopyranose

Study for the Manor Preboards Module 2 Test. Use flashcards and multiple choice questions that include hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Alpha-mannopyranose and beta-mannopyranose

Explanation:
Anomers are stereoisomers that differ in configuration at the anomeric carbon of a cyclic sugar. When mannose forms its six-membered ring (mannopyranose), the anomeric carbon is the carbon that was the carbonyl carbon in the open-chain form. Alpha- and beta-mannopyranose differ only in the orientation of the OH group on this anomeric carbon. All other stereocenters remain the same, so the two forms are the same molecule except for that one center. They are not enantiomers because they are not mirror images of each other. They are also not epimers, since epimers differ at a stereocenter other than the anomeric one; here the only difference is at the anomeric carbon. In solution, these forms can interconvert through mutarotation.

Anomers are stereoisomers that differ in configuration at the anomeric carbon of a cyclic sugar. When mannose forms its six-membered ring (mannopyranose), the anomeric carbon is the carbon that was the carbonyl carbon in the open-chain form. Alpha- and beta-mannopyranose differ only in the orientation of the OH group on this anomeric carbon. All other stereocenters remain the same, so the two forms are the same molecule except for that one center.

They are not enantiomers because they are not mirror images of each other. They are also not epimers, since epimers differ at a stereocenter other than the anomeric one; here the only difference is at the anomeric carbon. In solution, these forms can interconvert through mutarotation.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy