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Monosaccharides can undergo ring formation in aqueous solutions
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The ring structure is more stable due to the formation of a hemiacetal or hemiketal
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Example: glucose can exist as both a linear and a ring structure
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Glucose forms a ring structure called a pyranose ring
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The ring is formed by the reaction between the aldehyde group (C=O) and a hydroxyl group (OH) on the same molecule
OH OH | | HO-C-H HO-C-H | | | | | | C-O | C-O | | | | | CH2OH H2
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The ring structure results in the formation of an additional chiral carbon atom