Dimeric samarium(III) alkoxides bearing N2O2 tetradentate Schiff bases and their utility for the catalytic epoxidation of trans-chalcone

Synthesis, structure and reactivity of samarium complexes supported by Schiff-base ligands

“…For example, chiral Schiff-base transition metal complexes are extensively used in a variety of chemical transformations such as oxidation, hydroxylation, aldol condensation, epoxidation and other related catalytic processes [1][2][3], bis(phenoxyimine) group 4 metal complexes and phenoxyimine Ni(II) complexes are excellent precatalysts or catalysts for olefin polymerization [1,[4][5][6][7]. Lanthanide complexes bearing N 2 O 2 tetradentate Schiff-base ligands are efficient catalysts for the asymmetric epoxidation of a,b-unsaturated ketones [8], ringopening polymerization of lactide and related cyclic esters [9][10][11]. Chiral yttrium-salen complexes are reported to be excellent catalysts for enantioselective acyl transfer reactions between enolesters and secondary alcohols [12], asymmetric Aldol-Tishchenko reactions [13] and the ring-opening of epoxides mediated by TMSCN and TMSN 3 [14].…”

Synthesis, Crystal Structure, Fluorescent and Antioxidation Properties of Cerium(III) and Europium(III) Complexes with Bis(3‐methoxysalicylidene)‐3‐oxapentane‐1,5‐diamine

“…Schiff‐base ligands with N, O donor sets have often been used since they may assemble coordination architectures directed by the lanthanide(III) ions, whereas the lanthanide ions can promote Schiff‐base condensation and can give access to complexes of otherwise inaccessible ligands . Moreover, some lanthanide Schiff base complexes, which are isolated from aqueous solution show excellent physical properties such as magnetism and luminescence,, whereas other non‐aqueous lanthanide complexes can serve as homogeneous catalysts to catalyze asymmetric Aldol‐Tishchenko reactions, asymmetric epoxidation of α,β‐unsaturated ketones, asymmetric nitro‐Mannich reactions, other organic transformations, and ring opening polymerizations of ε‐caprolactone and related cyclic esters , …”

Synthesis, Structure, and Reactivity of Homodinuclear Lanthanide Complexes Bearing Salen‐type Schiff‐base Ligand

“…Over the past decade, Schiff‐base ligands, as one of the alternatives to cyclopentadienyl ligand, have received considerable and growing interest in the chemistry of lanthanide metals, due to their hard donor‐atom frameworks, stability, and easy modification 1. Moreover, some lanthanide Schiff base complexes, which are isolated from aqueous solution show excellent physical properties such as magnetism2 and luminescence,3 whereas other non‐aqueous lanthanide complexes can serve as homogeneous catalysts to catalyze asymmetric Aldol‐Tishchenko reactions,4 asymmetric epoxidation of α, β‐unsaturated ketones,5 asymmetric nitro‐Mannich reactions,6 other organic transformations,7 and ring opening polymerizations of ϵ‐caprolactone and related cyclic esters8. Generally, most of the Schiff base ligands with N, O donor set in the catalysts have remarkable ability to coordinate to metal cations and not to participate in chemical transformations.…”