Anomenc carbon

Hemiacetal formation between the carbonyl group and the C 4 hydroxyl yields the five membered furanose ring form The anomenc carbon is a new chirality center its hydroxyl group can be either cis or trans to the other hydroxyl groups of the molecule... 

The anomenc carbon m a cyclic acetal is the one attached to two oxy gens It IS the carbon that corresponds to the carbonyl carbon m the open chain form The symbols a and (3 refer to the configuration at the anomenc carbon... 

Section 23.9 Pyranose forms of carbohydrates resemble cyclohexane in their conformational preference for chair forms. The anomenc effect causes an electronegative substituent at the anomeric (C-1) carbon to be more stable when it is axial than when it is equatorial. The effect is believed to result from the delocalization of an electron pair of the ring oxygen into an antibonding orbital of the anomeric substituent. 

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