Enantioseparation of 3-chlorophenylglycine enantiomers using Mandyphos-Pd as chiral extractant

Chiral extractant plays a key role in chiral extraction, and considerable efforts have been undertaken for the development of new and efficient chiral extractants in recent years. This work demonstrated for the first time that chiral ferrocenyl diphosphine ligand (Mandyphos-Pd) had considerable ability to enantioseparate 3-Chlorophenylglycine enantiomers with separation factor (α) of 2.64. Mandyphos-Pd concentration and pH had significant influences on enantioselectivity, while operating temperature showed less influence. The extraction experiments can be performed at room temperature (20 ℃) which had the advantage of energy saving. After optimization, the highest performance factor (pf, 0.08376) was obtained at the condition of pH 7.8 and Mandyphos-Pd concentration 1.2 mmol·L^-1. According to the experimental results, the possible recognition mechanism was discussed.