902779-56-0Relevant academic research and scientific papers
Titanium salan catalysts for the asymmetric epoxidation of alkenes: Steric and electronic factors governing the activity and enantioselectivity
Talsi, Evgenii P.,Samsonenko, Denis G.,Bryliakov, Konstantin P.
, p. 14329 - 14335 (2014)
A new insight into the highly enantioselective (up to > 99.5% ee ) epoxidation of olefins in the presence of chiral titanium(IV) salan complexes is reported. A series of 14 chiral ligands with varying steric and electronic properties have been designed, a
Redox chemistry of copper complexes with various salen type ligands
Butsch, Katharina,Günther, Thomas,Klein, Axel,Stirnat, Kathrin,Berkessel, Albrecht,Neud?rfl, J?rg
, p. 237 - 246 (2013/02/23)
The two essential redox processes in Cu(II) salen (and salan) complexes Cu(II)/Cu(I) and [PhO]/[PhO[-]] were studied by electrochemical and spectroelectrochemical (UV-Vis-absorption or EPR) techniques on a series of complexes in which the salen (salan) type ligands bear various substituents R = H, F, Ph, tBu or CH3 on the linker C- or N-atoms or on the phenol core. The substitution pattern can be related to the stability of the phenoxy radicals. The geometry of the complexes (especially around the Cu atom) could be established by XRD for the new complex [(Me2salhexF4)Cu] {H2(Me2salhexF4) = (1R,2R)-N,N′-bis(2- hydroxy-3,5-di-fluoro-acetophenonylidene)-cyclohexane-1,2-diamine} in the solid and for all other derivatives by EPR in fluid solution. Also, the application of the complexes in oxidation catalysis was tested using the oxidation of benzyl alcohol.
PROCESS FOR PRODUCING OPTICALLY ACTIVE EPOXY COMPOUND, COMPLEX FOR USE IN THE PROCESS, AND PROCESS FOR PRODUCING THE SAME
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Page/Page column 18-19, (2010/11/28)
There is provided a method for industrially producing optically active epoxy compounds by asymmetrically epoxidizing prochiral unsaturated compounds with an oxidant using as a catalyst a single substance or a di-μ-oxo dimer derived therefrom represented by any of the following formulae (I), (I'), (II), (II'), (III), (III'), (IV), and (IV'): [wherein R1s are independently an alkyl group or an aryl group; R2s are independently an alkyl group or an aryl group; R3s are independently an alkyl group or an aryl group, provided that two R3s may be bonded with each other to form a ring; R4s are independently a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a nitro group, or a cyano group; M is TiY2 (Y is Cl, alkoxide, or a μ-oxo ligand)].
