Synthesis of Rare Earth Catalysts and Their Applications for Enantioselective Synthesis of Heterocyclic β-Amino Alcohols

Multifunctionality in Two Families of Dinuclear Lanthanide(III) Complexes with a Tridentate Schiff-Base Ligand

The employment of N-(2-carboxyphenyl)salicylideneimine in 4f metal chemistry has led to two families of dinuclear complexes depending on the lanthanide(III) used. Representative members exhibit interesting magnetic, optical, and catalytic properties.

Direct access to the optically active VAChT inhibitor vesamicol and its analogues via the asymmetric aminolysis of meso-epoxides with secondary aliphatic amines

First highly enantioselective synthesis of biologically important vesamicol, benzovesamicol, and their derivatives was achieved via the desymmetrization of meso-epoxides with secondary aliphatic amines (4-phenylpiperidine derivatives) using a chiral [salenCo(iii)-BF₄] catalyst at room temperature. All products were obtained in good yield and with excellent optical induction.

Effect of the concentration of the dopants (Er3+, Yb3+ and Zn2+) and temperature on the upconversion emission behavior of Er3+/Yb3+ co-doped SrAl2O4 phosphor

Er³⁺/Yb³⁺ co-doped SrAl₂O₄ (SRA: Er³⁺, Yb³⁺) phosphor has been synthesized by high temperature solid state reaction technique. The pure phase formation has been confirmed by X-ray diffraction (XRD) measurements. The surface morphology is studied by scanning electron microscopy (SEM) technique. The FTIR measurements give the information of vibrational bands arising due to sample. The intense UC emission from SRA: Er³⁺, Yb³⁺ phosphor has been monitored on excitation with 980nm diode laser. The SRA: Er³⁺, Yb³⁺ samples prepared at 1473K show a dominant green emission. On the other hand it shows dominant red emission when the sample is heated to 1623K. Variation of concentration of Er³⁺ and Yb³⁺ ions in SRA: Er³⁺, Yb³⁺ phosphor suggests two possible mechanisms involved in UC emission process viz. cross relaxation (CR) process and energy back transfer (EBT) process, respectively. The cross relaxation mechanism seems to play a major role. The UC emission efficiency is enhanced several times on co-doping of Zn²⁺ ion replacing Al³⁺ or Sr²⁺ in SRA: Er³⁺, Yb³⁺ phosphor sample. The color of the UC emission can be tuned from green to red region by varying the concentration of zinc.

A new recyclable functionalized mesoporous SBA-15 catalyst grafted with chiral Fe(iii) sites for the enantioselective aminolysis of racemic epoxides under solvent free conditions

A mesoporous SBA-15 supported chiral Fe(iii)-catalyst was prepared and used for the synthesis of chiral β-amino alcohols with very good yields and enantioselectivities (ee upto 98%) under neat conditions at RT.

A new chiral Fe(iii)–salen grafted mesoporous catalyst for enantioselective asymmetric ring opening of racemic epoxides at room temperature under solvent-free conditions

A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the enantioselective (ee > 99%) ARO reaction of racemic epoxides with aromatic amine under solvent-free conditions.