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R-S System of Representation

The R-S system of representation is a convenient and essential way of looking at molecules. The R-S convention is done by prioritizing the substituents that are bonded to the chiral carbon. [Pg.266]

The following rules will familiarize you with the R-S naming of compounds. [Pg.266]

The orientation of the molecule should be in such a way that the lowest priority group is pointing away from you. [Pg.266]

If two groups that are attached to a chiral carbon are isotopes (same atomic number, different mass numbers), the heavier isotope takes precedence. [Pg.266]

If two groups have the same atom connected to a chiral carbon, then the next atom along the chain determines the priority. If that too fails (if it is the same atom), then go to the next atom to determine which group has higher priority. For example, -CH F has a lower priority than -CHjl. If the groups contain unsaturations such as double or triple bonds, consider that the atoms on both ends are duplicated depending on the number of bonds. [Pg.267]


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