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Successively excluding feasible racemization causes, we discovered that these P-chiral ferrocenyl phosphines go through a substantial, acid-catalyzed racemization process at room temperature within seconds. This method is principally observed during standard line chromatography utilizing mainstream silica or alumina but can be triggered intentionally by addition of certain acids. Therefore, the stereochemical conservation of P-chiral phosphines throughout their purification may per se n
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