Question

Question: Convert each Haworth projection to its acyclic form.

a.

b.

Short answer

Answer

a.

b.

Step-by-step solution

Conversion of Haworth projection into acyclic form

To convert each Haworth projection into its acyclic form:

• Draw the C skeleton with the CHO on the top and the on the bottom.
• Draw in the OH group farthest from the C=O. A group drawn up means a D sugar; a group drawn down means an L sugar.
• Add the other three stereogenic centers, counterclockwise around the ring. “Up” groups go on the left, and “down” groups go on the right.

Explanation

a. The acyclic form of the given Haworth projection is shown as:

The OH placed below the side in the Haworth projection is now put in the right direction and vice-versa.

Conversion into acyclic form for a.

b. The acyclic form of the given Haworth projection is shown as:

Conversion into acyclic form for b.