E - Z Configuration and R-S Absolute Compound

E- Z Configuration

E = higher priority same       Z = higher priority opposite side 

Rule - 1 Identify double bond compound and stereocenter Compound  ( not necessarily chiral center ) 
2 when compound have Geometrical isomer or stereoisomer with mostly contain bouble bond but not necessari because anther type compound have count . Eg cyclobutane substituted compound.
3 First give to preference According to CIP Rule and preference is made between two group at each stereocenter
4 Notes :- Both Cis - Trans and E- Z not relation to each other 
More details shown fig..




R-S Configuration compound having Chiral Axis 

* Both  deffrence between Chiral Center and Chiral Axis 

Chiral Axis :- when present wedge atom (more dark in fig.) Out of Plane with attached atom in Plane and compound are Geometrical isomer or stereoisomer compound

Here Identify R-S A/C to CIP Rule but not followed reversed count when lower atomic No. horizontal plane at fisher form 
1 first rotate compound until unless wedge up (should be always up) and always desh down .
2 convert fisher form ( shown fig )
3 Then first Count No. Priority of wedge or desh (eg.Cl in desh give 1 No.  and H is desh given No. 2 ) 
4 And sscond are count plane (horizontal) in atom a/c to atomic Number 
Note :-- Not reversed when lower Atomic Number (4) 
5 whe all have done follow rule when counted Compound clock wise = R 
And Anticlock = S  (there are not change or not followed rule) 







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