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1.when the cyclic sturcture of glucose(hexose) is six-membered ring resembling the pyran ring, thus they are called pyranose
while when hexoses are found in five-membered ring resembling furan ring, thus they are called furanose
2.in aldohexose:
- The interaction between c=o and the secondary OH is found at c5 if it was pyranose
- the interaction between c=o and the secondary OH is found at c4 if it was furanose
in ketohexose:
- the interaction between c=o and the secondary OH is found at c6 if it was pyranose
- the interaction between c=o and the secondary OH is found at c5 if it was furanose
Both pyranose and furanose are cyclic forms of monosaccharides, with pyranose having a 6-membered ring structure and furanose having a 5-membered ring structure. The main difference lies in the number of carbon atoms in the ring and the ring size itself. Both forms can exist in different anomeric forms (α and β) and can undergo mutarotation.
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