L glucopyranose

[jjunior]

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Hi, this might be a stupid question, but how can you tell if a glucopyranose is D or L when its drawn in the chair form? is it by looking at the C6 whether its eq or axial or something? 😕

 

[loltopsy]

When you draw it in chair, L and D will have different positions at each stereogenic carbon (axial vs equatorial).

 

[jjunior]

so if we draw in a haworth's projection, a D-glucose would up-down-up-down-up (in terms of OH, and substituents from C1-C5) and L-glucose would be down-up-down-up-down?

 

[loltopsy]

No. Use this as a guide: http://legacy.jefferson.kctcs.edu/u...Supplements/structures/represent/fischer.html


I assume when you mean up vs down that you are referring to stereocenters. Your combinations don't match up to either glucose at all.