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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 (Ξ± and Ξ²) and can undergo mutarotation.
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