EXC - UniCat

6 Items

Recent Submissions
Controlled ligand distortion and its consequences for structure, symmetry, conformation and spin-state preferences of iron(II) complexes

Kroll, Nicole ; Theilacker, Kolja ; Schoknecht, Marc ; Baabe, Dirk ; Wiedemann, Dennis ; Kaupp, Martin ; Grohmann, Andreas ; Hörner, Gerald (2015)

The ligand-field strength in metal complexes of polydentate ligands depends critically on how the ligand backbone places the donor atoms in three-dimensional space. Distortions from regular coordination geometries are often observed. In this work, we study the isolated effect of ligand-sphere distortion by means of two structurally related pentadentate ligands of identical donor set, in the sol...

Palladium-catalysed hydroxylation and alkoxylation

Enthaler, Stephan ; Company, Anna (2011)

The formation of oxygen–carbon bonds is one of the fundamental transformations in organic synthesis. In this regard the application of palladium-based catalysts has been extensively studied during recent years. Nowadays it is an established methodology and the success has been proven in manifold synthetic procedures. This tutorial review summarizes the advances on palladium-catalysed C–O bond f...

A straightforward zinc-catalysed reduction of sulfoxides to sulfides

Enthaler, Stephan (2011)

In the present study, the zinc-catalysed reduction of a variety of sulfoxides with silanes as reductant to the corresponding sulfide has been examined in detail. With the straightforward and commercially available zinc(II) triflate as pre-catalyst, excellent yields and chemoselectivities were feasible. After studying the reaction conditions and the scope and limitations several attempts were un...

Iron-based pre-catalyst supported on polyformamidine for C-C bond formation

Enthaler, Stephan ; Krackl, Sebastian ; Epping, Jan Dirk ; Eckhardt, Björn ; Weidner, Steffen M. ; Fischer, Anna (2012)

In the present study the incorporation of iron into an organic polymer, composed of formamidine subunits [R–N[double bond, length as m-dash]C(H)–NH–R], has been examined. The catalytic ability of the recyclable material was investigated in the iron-catalyzed formation of C–C bonds. After optimization of the reaction conditions, excellent yields and chemoselectivities were feasible.

Dual functionality of formamidine polymers, as ligands and as bases, in ruthenium-catalysed hydrogen evolution from formic acid

Enthaler, Stephan ; Junge, Henrik ; Fischer, Anna ; Kammer, Anja ; Krackl, Sebastian ; Epping, Jan Dirk (2013)

In the present study, the ruthenium-catalysed decomposition of formic acid to yield hydrogen has been examined. A ruthenium complex modified polyformamidine network was used as a solid catalyst. As a dual support the polyformamidine acts both as a ligand and as a base for the activation of formic acid.

Enhanced catalytic performance of MnxOy-Na2WO4/SiO2 for the oxidative coupling of methane using an ordered mesoporous silica support

Yildiz, M. ; Aksu, Y. ; Simon, U. ; Kailasam, K. ; Görke, O. ; Rosowski, F. ; Schomäcker, R. ; Thomas, A. ; Arndt, S. (2014)

The oxidative coupling of methane is a highly promising reaction for its direct conversion. Silica supported MnxOy–Na2WO4 is a suitable catalyst for this reaction. In this study, a variety of different SiO2 materials have been tested as supports. Surprisingly, the application of ordered mesoporous silicas, here exemplarily shown for SBA-15 as support materials, greatly enhances the catalytic pe...