Catalyst is an additional substance used in the chemical reaction to increase the activation rate. Reactions often occur faster with a catalyst because they require less activation energy. Furthermore, catalysts can continue to act repeatedly since they are not consumed in the catalyzed reaction. In biology, enzymes are protein-based catalysts employed to prepare many commodity chemicals including high-fructose corn syrup and acrylamide.
A chiral auxiliary is a stereogenic group or unit that is temporarily incorporated into an organic compound in order to control the stereochemical outcome of the synthesis. The chirality present in the auxiliary can bias the stereoselectivity of one or more subsequent reactions. The auxiliary can then be typically recovered for future use.
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