L10-stereochemistry 3

What do you call/ how do you describe a chiral centre

Specific atoms are sterogenic and molecules are chiral

What are the CIP rules for determining how an enantiomer rotates

1. assign priority according to atomic number 

2. if a decision cant be made with the first atom look at second then third ect 

3. double bonds count as two atoms/sigma bonds same for triple but lone paris coumt as zero 

4. orientate the 4th atom at the back and then follow the sequence 

anticlockwise=S

clockwise=R

explain how re and si faces work and the difference between using R and S to describe

re and si describes the faces of the molecule

re describes the back face

si describes the front face 

explain what the use of the CIP rules are 

They are used to determine the configuration of an enantiomer and distinguish between mirror images