Cyclic Structure of Glucose

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joshto

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On Carbon # 1, I assumed that the -OH group should always point up. I assumed it must always be UP because, from doing practice problems, OH group, on glucose, alternates between up and down on each carbon.

However, I have just come across a problem in which we are given cyclic glucose with the -OH group on C1 pointing down.

After doing a bit of thinking, I believe that it can be up or down because the C6 hydroxyl (in the straight chain form) can attack the carbonly of C1 from either side.

Am I right??

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yeah, i think I answered my own question.

I guess I don't know why, or where, I ran into a tip where, in its cyclic form, the OHs on Glucose alternate up and down.
 
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