Chirality
Figure 82 Principle of Fischer projection
Operations on Fischer projections
- in a Fischer projection, exchange two substituent positions results in the inversion of the
stereocenter - rotation by 90° of the Fischer projection results in inversion
- rotation by 180° of the Fischer projection preserves the configuration
32.3 Naming conventions
There are three main systems for describing configuration: the oldest, therelativewhose
use is now deprecated, and the current, orabsolute. The relative configuration description
is still used mainly in glycochemistry. Configuration can also be assigned on the purely
empirical basis of the optical activity.