Question

Redraw (4S, 5R)-4-ethyl-5-propylnonane using wedges and dashes to show the correct stereochemistry

Answer 1

There are following rules to assign the R and configuration and draw the structure.

1)

When priority order is clockwise and the lowest priority group is behind the plane then we call it as R configuration.

And

When priority order is anticlockwise and the lowest priority group is behind the plane then we call it as S configuration.

2)

When priority order is clockwise and the lowest priority group is not behind the plane then we call it as S configuration.

When priority order is anticlockwise and the lowest priority group is not behind the plane then we call it as R configuration.

We use these rules to predict the structure.

ANSWER the pl ane 2 4s Coues piorty roup iSAbehind the plane)