[EN] ION PAIR CATALYSIS OF TUNGSTATE AND MOLYBDATE<br/>[FR] CATALYSE PAR PAIRE D'IONS DE TUNGSTATE ET DE MOLYBDATE
申请人:UNIV NANYANG TECH
公开号:WO2017164813A1
公开(公告)日:2017-09-28
D The present invention relates to ion pair catalysts (I) comprising the cationic bisguanidinium ligand (A) and diperoxomolybdate anion (B). The present invention also relates to ion pair catalysts (III) comprising the cationic bisguanidinium ligand (C) and peroxotungstate anion (D). It further relates to the use of the said catalysts in the manufacture of enantiomerically enriched sulfoxides.
Sensitive nature of ligand coupling and pseudorotation to electronic effect of substituent---ligand coupling in the reactions of benzylic aryl sulfoxides with benzylic Grignard reagents
Unlike the reaction of benzylic 2-pyridyl sulfoxides with benzylic Grignardreagents, in the reaction of p-benzenesulfonylphenyl benzylic sulfoxides with benzylic Grignardreagents, benzylic groups bearing an electron-withdrawing group tends to couple with the aryl group preferentially. This change is considered to be due to a slight change of electronic environements which would effect on the ease
D The present invention relates to ion pair catalysts (I) comprising the cationic bisguanidinium ligand (A) and diperoxomolybdate anion (B). The present invention also relates to ion pair catalysts (III) comprising the cationic bisguanidinium ligand (C) and peroxotungstate anion (D). It further relates to the use of the said catalysts in the manufacture of enantiomerically enriched sulfoxides.
D 本发明涉及由阳离子双胍配体(A)和二氧钼酸阴离子(B)组成的离子对催化剂(I)。本发明还涉及由阳离子双胍配体(C)和过氧钨酸盐阴离子(D)组成的离子对催化剂(III)。本发明还涉及上述催化剂在制造对映体富集的硫氧化物中的用途。
Oae, Shigeru; Kawai, Tsutomu; Furukawa, Naomichi, Journal of the Chemical Society. Perkin transactions II, 1987, p. 405 - 412