Fischer (R)and (S) Lowest priority (usually H)comes forward,so assignment rules are backwards! Clockwise 1-2-3 is (S)and counterclockwise 1-2-3 is (R). Example: (S) CH3 H -CI Cl 一H (S9 CH3 Fischer (R) and (S) ❖Lowest priority (usually H) comes forward, so assignment rules are backwards! ❖Clockwise 1-2-3 is (S) and counterclockwise 1-2-3 is (R). ❖Example: CH3 H Cl Cl H CH3 (S) (S)