anomeric carbon

[bittersweet008x]

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I just have a pretty simple question-- what is the best way to identify an anomeric carbon?

 

[crax]

i just practiced a few of them to figure it out in the straight chain projections, and would try and use the #6 carbon (in 6 membered rings) and work backwards to know that the #5 was part of the chain and the #6 wasnt. there may be a better method

 

[LaughingGas]

just look if they are hemiacetals/hemiketals if my memory serves correctly...

 

[jmukid]

In a sugar if there is an oh (hemiacetal) group on carbon 1 then it is called an anomeric carbon. If there is a hemiacetal group present then the sugar is reducing, mutarotates, has positive tollens and benedicts test.