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Copper Complexes of Chiral Tetradentate Binaphthyl Schiff‐Base Ligands: Syntheses, X‐ray Crystal Structures and Activity in Catalytic Asymmetric Cyclopropanation of Alkenes
Author(s) -
Che ChiMing,
Kwong HoiLun,
Chu WaiCheung,
Cheng KinFai,
Lee WingSze,
Yu HingSun,
Yeung ChiTung,
Cheung KeungKai
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200206)2002:6<1456::aid-ejic1456>3.0.co;2-h
Subject(s) - cyclopropanation , chemistry , schiff base , ethyl diazoacetate , copper , catalysis , monomer , chirality (physics) , crystal structure , stereochemistry , polymer chemistry , medicinal chemistry , crystallography , organic chemistry , polymer , chiral symmetry , nambu–jona lasinio model , physics , quantum mechanics , quark
A number of new chiral monomeric binaphthyl Schiff‐base ligands H 2 L [where H 2 L = 2,2′‐bis(3‐R 1 ‐5‐R 2 ‐2‐hydroxybenzylideneamino)‐1,1′‐binaphthyl] and a series of chiral copper(II) complexes [CuL] were prepared in good or nearly quantitative yields. Some of the free ligands and the [CuL] complexes were structurally characterized by X‐ray crystallography. Almost all the [CuL] complexes were found to be active catalysts for the asymmetric cyclopropanation of alkenes with ethyl or tert ‐butyl diazoacetate. Enantioselectivities of up to 77% ee were observed. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)