Metal-bis(oxazoline) complexes: From coordination chemistry to asymmetric catalysis

New Chemistry with Anionic NNN Pincer Ligands

“…Among these, many chiral pincer ligands reported are of C 2 -symmetry, although this has not precluded the use of other nonsymmetric chiral ligands that have also been reported and applied in coordination chemistry and catalysis. In fact, the presence of rotational symmetry can be considered desirable, and the benefits of C 2 -symmetrical ligands based on bis(oxazoline)s have been reviewed in detail [6]. One series of NNN donor complexes is based upon the neutral BOX bis(oxazoline) bidentate framework in which the central CH 2 unit of BOX is replaced by pyridine (pyBOX) [7,8].…”

Catalytic Epoxidation and Sulfoxidation Activity of a Dioxomolybdenum(VI) Complex Bearing a Chiral Tetradentate Oxazoline Ligand

“…All these complexes contained two asymmetric centers. Despite the fact that oxazoline derivatives have been applied successfully as chiral ligands for a large number of metal-catalyzed reactions, often giving products of high enantiopurity [26][27][28], the Mo VI complexes exhibited very poor or no asymmetric induction for the epoxidation of styrene or trans-b-methylstyrene using TBHP as oxidant. For methylenebis(oxazoline) complexes, the nature of the substituent at the C(4) position of the oxazoline ring had some effect on catalytic activity, but did not improve stereoselectivity [17].…”

Two cadmium(II) complexes with oxazoline-based ligands as effective catalysts for C–N cross-coupling reactions

“…Typically, these type ligands are good r-donors and weak p-acceptors which can be easily modified using appropriate commercially available amino alcohol precursors to attain the desired steric-bulk or electronic properties. Within the past years, reports about pincer and bisoxazolines transition metal complexes' exceptional catalytic abilities have been reported [2][3][4][5][6][7][8]. Continuing our research interests in bisoxazolines and pincer complexes due to their rich chemistry [9][10][11], we seek to discover new transition metal complexes and hope to exploit their chemistry in a variety of potential catalytic applications.…”