Question

Draw the Fischer projection for the monosaccharide drawn as a Haworth projection below. Switch between an aldose and a ketose by clicking on "switch carbonyl group." Add or delete carbon atoms using the add ("+") or delete ("x") buttons. Clicking on a blue box once adds a hydrogen atom (H). Clicking on a blue box again toggles between H and OH.

Draw the Fischer projection for the monosaccharide drawn as a haworth projection below.

Answer 1

Concepts and reason

The concept used to solve this problem is converting of Haworth projection to Fischer projection. The cyclic structure is given in the question, so draw in straight chain. Place the –OH group at appropriate positions using the rules of converting cyclic ring structure to straight chain structure.

Fundamentals

The substituents/groups which are facing towards up in Haworth projection, must be placed on left side of the fisher projection. Similarly, the groups which are facing towards down in Haworth projection, must be placed on right side of the fisher projection.

The structure is as follows:

The Fischer projection is as follows:

The structure is as follows:

Ans:

The Fischer projection is,