Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: SkjaldbakaSykur on February 17, 2017, 04:42:06 AM
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Hi guys,
trying to draw glycans in chair conformation and all the styles in ChemDraw I try (e.g. ACS document 1996) produce structures with unparallel bonds. e.g. C4-OH should be parallel to C2-C3 and C5-O and C5-C6 to C3-C4. (I use the ChemDraw pyranose conformation templates). Not really an expert using ChemDraw but wondering if there is any easy way to fix this...
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Can you post a picture (save as .gif or similar and attach it to you post)?
It's not clear what the problem is, templates>hexoses gives you chairs will all bonds drawn in at the correct angles. When drawing bonds manually, if you left click and hold you can move the mouse to adjust the angle, then let go of the left mouse button when you're happy with it.
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When I add the hexose templates, the angles are incorrect (I think) - see attachement. I wonder why that is. I have now drawn them manually
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Ah ok, yes I see they are a little off parallel. Looks like they were trying to get a bit more of a perspective effect.
Templates>Conformers has chairs with parallel substituents.
I usually just draw them by hand.
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I don't really see any problem with the structures you've given. Is there any reason they need to be 100% parallel? If there is a problem with the bonds you've outlined, it's very, very minor.