how to determine absolute configuration (R,S and E,Z)

further chem
R/S configuration:

1. identify a stereocenter
2. put the hydrogen in the back
3. find each atom’s atomic mass (if same, go to next attached)
4. draw arrows between atoms, descending in atomic mass
5. clockwise = R anticlockwise = S

cahn-ingold-prelog
rectus/sinister

E/Z configuration:

1. identify double bond carbon
2. assign priorities according to CIP rules see how to determine absolute configuration (R,S and E,Z) for groups on either side
3. if higher priorities on same side: z, opposite sides: e

E: entgegen (enemies)
Z: zusammen (zame)

(1E,4Z)-1,5-dichloro-1,4-hexadiene