L10 - Stereochemistry 3

Question 1

What is the old system of stereochemistry D or L?

Answer 1

it was D if it matches the D-glyceraldehyde

Question 2

What are the Cahn, ingold, prelog (CIP) rules?

Answer 2

1. assign priority according to atomic
2. if a decision cannot be made with 1st atoms, apply to 2nd
3. double bonds count as 2 bonds to the same atom
4. lone pair counts as 0
   5!!. orientate 4 at the back and follow the sequence

Question 3

What is R and S?

Answer 3

R - clockwise configuration
S - anti-clockwise configuration

Question 4

what are molecules and centres in terms of sterochemistry?

Answer 4

molecules are chiral
centres are stereogenic