Karl Kirchner
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View article: Synthesis, Characterization and Catalytic Activity of Iron, Cobalt and Nickel Complexes Bearing an N-Heterocyclic Carbene-Based PCP Pincer Ligand
Synthesis, Characterization and Catalytic Activity of Iron, Cobalt and Nickel Complexes Bearing an N-Heterocyclic Carbene-Based PCP Pincer Ligand Open
Reactions of the bis-((R2phosphanyl)-methyl)-1H-benzo-[d]-imidazole-3-ium hexafluorophosphate precursors [(PCP-R)-H]-PF6 (R = iPr, Ph) with zerovalent precursors [Fe3(CO)12], [Co2(CO)8], [Ni-(COD)2] and [Ni-(PPh3)4], respectively, gave ris…
View article: Synthesis and Application of PN-Supported Mn(I) Carbonyl Alkyl Complexes
Synthesis and Application of PN-Supported Mn(I) Carbonyl Alkyl Complexes Open
This work comprises the synthesis and characterization of aminophosphine (PN)-derived Mn(I) carbonyl complexes and the preliminary investigation of their alkylated congeners for catalytic applications. The complexes fac-[Mn(PN)(CO)3Br] are…
View article: Hydrosilylation of Alkynes Catalyzed by an Iron(II) PCP Pincer Alkyl Complex
Hydrosilylation of Alkynes Catalyzed by an Iron(II) PCP Pincer Alkyl Complex Open
Vinylsilanes are very useful building blocks in organic synthesis and have widespread applications in life sciences and materials chemistry. Here we describe the potential of complex cis ‐[Fe(PCP‐ i Pr)(CH 2 CH 2 CH 3 )(CO) 2 ] as an effec…
View article: Influence of η<sup>1</sup>‐Acetylide Ligands on the Spin State and Catalytic Activity of Iron(II) PNP Pincer Complexes
Influence of η<sup>1</sup>‐Acetylide Ligands on the Spin State and Catalytic Activity of Iron(II) PNP Pincer Complexes Open
Here, we report the preparation, structures and reactivity of iron(II) PNP pincer complexes bearing one, two or three η 1 ‐acetylide ligands bound to the metal center. The described complexes are accessible through the reaction of either o…
View article: Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex
Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex Open
An additive-free manganese-catalyzed isomerization of terminal alkenes to internal alkenes is described. This reaction is implementing an inexpensive nonprecious metal catalyst. The most efficient catalyst is the borohydride complex cis-[M…
View article: The striking influence of solubility on the nuclearity of cobalt NCN pincer complexes
The striking influence of solubility on the nuclearity of cobalt NCN pincer complexes Open
The synthesis and characterization of two Co(II) complexes stabilized by NCN pincer ligands are described. The paramagnetic Co(II) complex [Co(κ 3 NCN- NCN CH2 - i Pr)Br] is obtained via a transmetalation protocol from CoBr 2 and NC(C–Br)N…
View article: Hydrogenation of Alkenes Catalyzed by Mn(I) Alkyl Complexes Bearing NHC Phosphine Ligands
Hydrogenation of Alkenes Catalyzed by Mn(I) Alkyl Complexes Bearing NHC Phosphine Ligands Open
An efficient additive free hydrogenation of alkenes with molecular hydrogen is described. The pre‐catalyst is a well‐defined bench stable Mn(I) alkyl complex bearing a NHC phosphine ligand. These reactions are environmentally benign and at…
View article: Hydroboration of Terminal Alkynes Catalyzed by a Mn(I) Alkyl PCP Pincer Complex Following Two Diverging Pathways
Hydroboration of Terminal Alkynes Catalyzed by a Mn(I) Alkyl PCP Pincer Complex Following Two Diverging Pathways Open
A stereo- and regioselective Mn(I)-catalyzed hydroboration of terminal alkynes with pinacolborane (HBPin) is described. The hydroboration reaction is highly Z-selective in the case of aryl alkynes and E-selective in the case of aliphatic a…
View article: The striking influence of solubility on the nuclearity of cobalt NCN pincer complexes
The striking influence of solubility on the nuclearity of cobalt NCN pincer complexes Open
The synthesis and characterization of two Co(II) complexes stabilized by NCN pincer ligands is described. The paramagnetic Co(II) complex [Co(κ3NCN-NCNCH2-iPr)Br] (1) is obtained via a transmetalation protocol from CoBr2 and NC(C-Br)NCH2-i…
View article: Hydrogenation of Alkenes Catalyzed by Mn(I) Alkyl Complexes Bearing NHC Phosphine Ligands
Hydrogenation of Alkenes Catalyzed by Mn(I) Alkyl Complexes Bearing NHC Phosphine Ligands Open
An efficient additive free hydrogenation of alkenes with molecular hydrogen is described. The pre-catalyst is a well-defined bench stable Mn(I) alkyl complex bearing a NHC phosphine ligand. These reactions are environ-mentally benign and a…
View article: Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex
Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex Open
An additive-free manganese-catalyzed isomerization of terminal alkenes to internal alkenes is described. This reaction is atom economic, implementing an inexpensive, non-precious metal catalyst. The most efficient catalyst is the borohydri…
View article: Hydroboration of Terminal Alkynes Catalyzed by a Mn(I) Alkyl PCP Pincer Complex following Two Diverging Pathways
Hydroboration of Terminal Alkynes Catalyzed by a Mn(I) Alkyl PCP Pincer Complex following Two Diverging Pathways Open
A stereo- and regioselective Mn(I)-catalyzed hydroboration of terminal alkynes with pinacolborane (HBPin) is described. The hydroboration reaction is highly Z-selective in the case of aryl alkynes and E-selective in the case of aliphatic a…
View article: Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex
Alkene Isomerization Catalyzed by a Mn(I) Bisphosphine Borohydride Complex Open
An additive-free manganese-catalyzed isomerization of terminal alkenes to internal alkenes is described. This reaction is atom economic, implementing an inexpensive, non-precious metal catalyst. The most efficient catalyst is the borohydri…
View article: The Effect of Selenium-Based Ligands on Tungsten Acetylene Complexes
The Effect of Selenium-Based Ligands on Tungsten Acetylene Complexes Open
Bioinspired tungsten acetylene complexes containing pyridine-2-selenolato (PySe) or 6-methyl-pyridine-2-selenolato (6-MePySe) ligands were synthesized. 77Se NMR spectroscopy allowed for an assessment of the resonance structures in the pyri…
View article: Is Mn(I) More Promising Than Fe(II)─A Comparison of Mn vs Fe Complexes for Olefin Metathesis
Is Mn(I) More Promising Than Fe(II)─A Comparison of Mn vs Fe Complexes for Olefin Metathesis Open
Olefin metathesis is one of the most significant transformations in organic chemistry and is an excellent example for efficient homogeneous catalysis. Although most currently used catalysts are primarily based on 4d and 5d metals, cycloadd…
View article: Is Mn(I) more promising than Fe(II) – A comparison of Mn vs. Fe complexes for olefin metathesis
Is Mn(I) more promising than Fe(II) – A comparison of Mn vs. Fe complexes for olefin metathesis Open
Olefin metathesis is one of the most significant transformations in organic chemistry and an excellent example for efficient homogeneous catalysis. Although most currently used catalysts are primarily based on 4d and 5d metals, cycloadditi…
View article: Manganese catalysed reduction of nitriles with amine boranes
Manganese catalysed reduction of nitriles with amine boranes Open
The room temperature reduction of various nitriles using amine boranes catalysed by a manganese( i ) alkyl complex is described. Based on experimental findings, a plausible mechanistic scenario is presented.
View article: CCDC 1822153: Experimental Crystal Structure Determination
CCDC 1822153: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1843670: Experimental Crystal Structure Determination
CCDC 1843670: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2278843: Experimental Crystal Structure Determination
CCDC 2278843: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2278844: Experimental Crystal Structure Determination
CCDC 2278844: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1521004: Experimental Crystal Structure Determination
CCDC 1521004: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544092: Experimental Crystal Structure Determination
CCDC 1544092: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544094: Experimental Crystal Structure Determination
CCDC 1544094: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544095: Experimental Crystal Structure Determination
CCDC 1544095: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544096: Experimental Crystal Structure Determination
CCDC 1544096: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544091: Experimental Crystal Structure Determination
CCDC 1544091: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1449666: Experimental Crystal Structure Determination
CCDC 1449666: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1544093: Experimental Crystal Structure Determination
CCDC 1544093: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …