Abstract
Chiral bisoxazoline ligands containing naphthyridine, pyridazine, pyrazole, and phenol bridging units were prepared and shown to form bimetallic complexes with various metal salts. X-ray crystal structures of bis-nickel naphthyridine-bridged, bis-zinc pyridazine-bridged, and bis-nickel as well as bis-palladium pyrazole-bridged complexes were obtained.
Highlights
Metal-centered asymmetric catalysis most commonly relies on monometallic complexes of various chiral ligands, among which chiral bisoxazolines have been highly successful in facilitating various Lewis acid-catalyzed asymmetric transformations [1,2,3]
In addition to monometallic catalysis, it has long been recognized that catalysts possessing two or more metal centers in close proximity can be uniquely effective in catalyzing certain types of reactions [4,5,6]
We rationalized that the presence of three binding sites per metal center would be ideal in order to achieve the desired 1:2 ligand to metal ratio, and to prevent the potential formation of 2:2 or other higher order complexes
Summary
Metal-centered asymmetric catalysis most commonly relies on monometallic complexes of various chiral ligands, among which chiral bisoxazolines have been highly successful in facilitating various Lewis acid-catalyzed asymmetric transformations [1,2,3]. The asymmetric unit of the crystal 16·Ni2(OAc)2 contains two nickel(ΙΙ) centers held in close proximity by three donor nitrogen atoms per metal center and two differently bridged acetate ions inside the coordination sphere. The nitrogen atoms on the naphthyridine and amide moieties bind to the nickel(ΙΙ) center to form a five-membered metallacycle, subtending N(2)–Ni(1)–N(3) and N(5)–Ni(2)–N(6) angles of 81.53° and 80.34°, respectively.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
