Page 77 - Pharm.Org.Chem-I 02-06-05-101
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I- Biphenyls
3' 2' 2 3
4' 1' 1
4
5' 6' 6 5
the same plane perpendicular planes
COOH NO2 COOH
NO2
COOH enantiomers COOH
NO2 NO2
6,6'-dinitrobiphenyl-2,2'-dicarboxylic acid
no plane of sym. optically active
149
Br
NO2 COOH COOH Br COOH
2',6'-dinitrobiphenyl-2,6- 3- Bromo-2'-methyl-6'-nitro- 4- Bromo-2'-methyl-6'-nitro-
dicarboxylic acid biphenyl-2,6-dicarboxylic acid biphenyl-2,6-dicarboxylic acid
optically inactive
optically active optically inactive
150
75
