Enantioselective extraction of di-O-benzoyltartrate anion by ion-pair extractant having binaphthyl-unit

A Ohki, R Miyashita, K Naka, S Maeda

Index: Ohki, Akira; Miyashita, Ryo; Naka, Kensuke; Maeda, Shigeru Bulletin of the Chemical Society of Japan, 1991 , vol. 64, # 9 p. 2714 - 2719

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Citation Number: 17

Abstract

A lipophilic diphosphonium salt 1 having binaphtyl-type axial chirality was developed as a novel ion-pair extractant. By use of (R)-1,(−)-di-O-benzoyltartrate ((−)-DBT) was extracted more effectively than (+)-DBT. The enantioselectivity (α= D (−)⁄ D (+); D: distribution ratio) was 1.3–1.4. When monophosphonium-type extractants (2 and 3) having structures similar to that of 1 were used, the enantioselectivity was heavily lowered. Equilibrium studies ...