Sugars Question: Is Galactose Formed from Glucose?

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SUMMARY

The discussion centers on the relationship between glucose and galactose, specifically whether galactose can be formed from glucose through carbon rotation. Participants clarify that while glucose exists in equilibrium between its alpha and beta isomers, the structural differences between glucose and galactose are due to the positioning of hydroxyl (OH) groups on the carbon atoms, which cannot be altered simply by rotation. Additionally, the conversation touches on the reducing sugars test using Benedict's solution, highlighting the role of hydroxide ions (OH-) derived from the self-ionization of water in the reaction.

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  • Knowledge of isomerism and chiral carbons in organic chemistry
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mattg443
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Hi.

When glucose is dissolved into water it forms d-glucose where it is equilibrium with its alpha and beta glucose isomers since the end carbon can rotate. (yes?)

Just wondering if it was possible that some of the middle carbons rotated and then some galactose was produced (since it differs only in the position of OH groups in the ring).

Any thoughts?
 
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Carbon rotation is not enough to change one into another.
 
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No, it is a chiral carbon.
 
Okay, haven't come across that yet. But thanks.
Another related question - in the reducing sugars test, using beddedicts solution, the reaction involves OH- ions, yet Bennidicts solution is CuSO4. Do the OH- ions come from the self ionisation of water?
Thanks (im only in high school, so sorry if my questions seem basic (pun not intended))
 

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