A chiral auxiliary is a chemical compound or unit that is temporarily incorporated into an organic synthesis so that it can be carried out asymmetrically with the selective formation of one of two enantiomers . Chiral auxiliaries are optically active compounds and introduce chirality in otherwise racemic compounds. The temporary stereocenter then forces the asymmetric formation of a second stereocenter using steric hindrance or directing groups to determine chirality. After the creation of the second stereocenter the original auxiliary can be removed in a third step and recycled.
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