L1 /
4
CH1012
OPTICAL ISOMERS
optical isomers = enantiomers
They must contain a chiral centre a carbon which has 4 different groups attached to it.
They must contain a chiral centre a carbon which has 4 different groups attached to it.
Chiral molecule = a
molecule which exists in
2 forms, non-superimposable mirror images.
2 forms, non-superimposable mirror images.
S R
1 1
2 3 3 2
(i) enantiomers are labelled either R or S
(ii) arrange highest (1) ® lowest (3) priority
view down C with lowest priority bond opposite
view down C with lowest priority bond opposite
(iii) clockwise = R; anticlockwise = S
