We have successfully prepared an unsymmetrical analogue of a Katsuki-type salen ligand having a single hydroxyalkyl group at its 6-position, and also its Mn(III) complex; attachment of the complex to a polymer gives a highly enantioselective and recoverable catalyst for epoxidation of 1,2-dihydronaphthalene.

We demonstrate an efficient enantioselective oxidation of secondary alcohols catalyzed by Mn(III)-salen complex using N-bromosuccinimide (NBS) as the oxidant. The new protocol is very efficient for the oxidative kinetic resolution of a variety of secondary alcohols, including ortho-substituted benzylic alcohols.

An insoluble, porous, amorphous, homochiral material based on a polypeptide titanium-phosphonate scaffold with an encapsulated achiral Mn(III)-salen was prepared and characterized. Consecutive epoxidation and hydration of styrene and its derivatives by aqueous hypochlorite in THF showed the highly enantioselective (>99%) formation of styrene diol derivatives.

The C(2)-symmetrical "salen" ligand (+)-9 bearing two [5]ferrocenophane substituents has been prepared in five steps starting from readily available diacetylferrocene, p-hydroxybenzaldehyde and (R,R)-N,N'-diphenylethylenediamine. Reaction of (+)-9 with Mn(OAc)(3), Co(OAc)(2) ZnEt(2) or UO(2)(OAc)(2) gave the corresponding metal-complexes which were characterised by spectroscopic methods.

The design and the synthesis of chiral macrocycles acting as enantioselective receptors is of great interest in the field of enzyme mimicking enantioselective catalysis as well as in that of racemic resolution and of chiral sensing. Recently particular attention has been devoted to neutral ditopic receptors able to simultaneously bind chiral ammonium cations and their counteranions. In this wor...

The obtaining of aldehydes or ketones through oxidative cleavage of vicinal diols requires the use of a catalyst. In this work we present the positive effects of ionic liquids in the homogeneous oxidative cleavage of ethylenglycol, pinacol, benzopinacol and hydrobenzoin, catalyzed by Mn(salen) complexes. The catalyst dissolved in ionic liquids allows high efficiency (yield up to 99% with air as...

A novel chiral macrocyclic ligand incorporating a chiral salen moiety into a framework containing two biphenyl units was synthesized. Structural properties and conformational aspects of the free ligand and an UO2 complex were studied by using NMR spectroscopy in solution and MM calculations. The Mn(III) complex was tested as catalyst in enantioselective oxidation of prochiral unfunctionalized o...

The title compound, [CoFe(C5H5)(C16H14N2O2)(C11H9N2O)], was prepared as an air-stable red-brown solid by mixing equimolar amounts of {2,2'-[ethane-1,2-diylbis(nitrilo-methanylyl-idene)]diphenolato}cobalt(II) and N-ferrocenylisonicotinamide in dry di-chloro-methane under nitro-gen and was characterized by ESI-MS, IR, and single-crystal X-ray diffraction. The structure at 100 K has triclinic (P-1...