776318-58-2Relevant academic research and scientific papers
Chiral bipyridine-copper(II) complex. Crystal structure and catalytic activity in asymmetric cyclopropanation
Kwong, Hoi-Lun,Lee, Wing-Sze,Ng, Hung-Foon,Chiu, Wing-Hong,Wong, Wing-Tak
, p. 1043 - 1046 (1998)
A chiral bipyridine-copper(II) complex has been prepared and its crystal structure determined. The structure involves a CuN2Cl2 compressed tetrahedral stereochemistry. Chiral bipyridine complexes of copper-(I) and -(II) triflate are
Asymmetric cyclopropanation of olefins catalysed by Cu(i) complexes of chiral pyridine-containing macrocyclic ligands (Pc-L*)
Castano, Brunilde,Guidone, Stefano,Gallo, Emma,Ragaini, Fabio,Casati, Nicola,MacChi, Piero,Sisti, Massimo,Caselli, Alessandro
, p. 2451 - 2462 (2013/03/28)
The synthesis and characterisation of copper(i) complexes of chiral pyridine-containing macrocyclic ligands (Pc-L*) and their use as catalysts in asymmetric cyclopropanation reactions are reported. All ligands and metal complexes were fully characterised, including crystal structures of some species determined by X-ray diffraction on single crystals. This allowed characterising the very different conformations of the macrocycles which could be induced by different substituents or by metal complexation. The strategy adopted for the ligand synthesis is very flexible allowing several structural modifications. A small library of macrocyclic ligands possessing the same donor properties but with either C1 or C2 symmetry was synthesized. Cyclopropane products with both aromatic and aliphatic olefins were obtained in good yields and enantiomeric excesses up to 99%.
Silica "sHB" chiral Pc-L* copper complexes for halogen-free solvent cyclopropanation reactions
Castano, Brunilde,Zardi, Paolo,Hoenemann, Yvonne C.,Galarneau, Anne,Gallo, Emma,Psaro, Rinaldo,Caselli, Alessandro,Santo, Vladimiro Dal
, p. 22199 - 22205 (2013/11/06)
The grafting of the preformed Pc-L* (pyridine containing macrocyclic ligands) copper(i) complexes on different ordered and non-ordered silicas, and their use, under heterogeneous batch conditions, as catalysts for the olefin cyclopropanation are reported.
Designing new ligands: Asymmetric cyclopropanation by Cu(I) complexes based on functionalised pyridine-containing macrocyclic ligands
Caselli, Alessandro,Cesana, Francesca,Gallo, Emma,Casati, Nicola,MacChi, Piero,Sisti, Massimo,Celentano, Giuseppe,Cenini, Sergio
scheme or table, p. 4202 - 4205 (2009/02/03)
The synthesis and characterisation of copper(i) complexes, including two crystal structures of the new chiral pyridine-containing macrocyclic ligands (PC-type), and their use as catalysts in asymmetric cyclopropanation reactions are reported.
Supramolecular double helical Cu(I) complexes for asymmetric cyclopropanation
Yeung, Chi-Tung,Yeung, Ho-Lun,Tsang, Chui-Shan,Wong, Wai-Yeung,Kwong, Hoi-Lun
, p. 5203 - 5205 (2008/09/19)
Chiral double-stranded helicates, formed between Cu(I) ion and C 2-symmetric oligopyridines, were used for catalytic asymmetric cyclopropanation of alkenes; low catalyst loadings (0.2 mol%), high TONs (up to 404) and short reaction times (30-60
Vitamin B12 derivatives as natural asymmetric catalysts: enantioselective cyclopropanation of alkenes.
Chen, Ying,Zhang, X Peter
, p. 2431 - 2435 (2007/10/03)
Vitamin B(12) derivatives were found for the first time to be general and efficient catalysts for asymmetric cyclopropanation of alkenes with ethyl diazoacetate (EDA). Among several common derivatives, aquocobalamin (B(12a)) was shown to be the most effec
