Interpretation:
The prochiral face of the double bond of fumaric acid to which the
Concept introduction:
A trigonal
Carbon which is bonded to three different types of atoms or groups can potentially be a prochirality center.
The two prochiral faces of a trigonal atom are enantiotopic and are designated as
The priorities around the trigonal carbon atom are assigned on the basis of Cahn–Ingold–Prelog rules.
If decreasing priority of the other three substituents traces the clockwise path, it is designated as
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