If the ring is 5 membered it is called a furanose if

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Unformatted text preview: rnal hemiacetals (the carbonyl reacts with an -OH in the same molecule), resulting in a ring. If the ring is 5-membered, it is called a furanose; if it is 6-membered, it is called a pyranose. [Note that when the ring is formed, the former carbonyl carbon becomes tetrahedral and a chiral center.] Glucose forms two pyranoses when dissolved in water; they differ from each other in configuration around the former carbonyl carbon. 4                                 ...
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