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What OH groups are axial in β-D-altropyranose? Having a lot of trouble drawing the compound in chair and boat conformation.

It looks like none of the OH groups are in axial position and all are equatorial. I have found several different drawings of this compound and have become very confused.

Answer 1

Addison Armstrong

Here's how I work it out.

The structures of D-altrose and D-Glucose are

groups are equatorial.

Thus, in β-d-altropyranose, the #"OH"# groups on carbons 2 and 3 are axial.

I couldn't find an image of the molecule, so I drew the one below, omitting all H atoms except those on the ring.

The #"OH"# groups on carbons 2 and 3 are axial. The others are equatorial.

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Answer 2

Lucy Alessi

In the β-D-altropyranose structure, the axial hydroxyl groups are located at the C-2, C-3, and C-5 positions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.