Position the stereo-centre so that the lowest priority group is at the back.
The other three groups now form a circle. Order them in terms of priority. If the order of decreasing priority is clockwise the chiral centre is "R" (rectus = right handed).
If the order shows an anticlockwise rotation it is designated "S" for sinister = left handed.
Position the stereo-centre so that the lowest priority group is at the back.
The other three groups now form a circle. Order them in terms of priority. If the order of decreasing priority is clockwise the chiral centre is "R" (rectus = right handed).
If the order shows an anticlockwise rotation it is designated "S" for sinister = left handed.