Marc Schmidtmann
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View article: Water-Soluble, Titanocene-Based Prodrugs with Thiosemicarbazones as Cytotoxic Agents
Water-Soluble, Titanocene-Based Prodrugs with Thiosemicarbazones as Cytotoxic Agents Open
Prodrugs that improve drug delivery in the body are highly desirable because they increase drug solubility and activity, thereby reducing drug concentration and side effects compared to the actual active compound. In this work, we demonstr…
View article: Rational Design of Cationic Silyl Lewis Acids
Rational Design of Cationic Silyl Lewis Acids Open
The synthesis of a series of selanyl‐stabilized cationic silyl Lewis acids with naphthalene or acenaphthalene scaffolds is described. The influence of scaffold modifications, substitution variations at the selanyl donor and at the silicon …
View article: Fluctuating Behavior and Ligand-Dependent Reactivity of Isocyanates with Bis(pentafulvene)titanium Complexes
Fluctuating Behavior and Ligand-Dependent Reactivity of Isocyanates with Bis(pentafulvene)titanium Complexes Open
Reactions of bis(π-η5:σ-η1-pentafulvene)titanium complexes with isocyanates result in selective insertions of either one or two equivalents of RN═C═O into the two frustrated Ti-Cexo bonds under mild conditions. Depending on the pentafulven…
View article: Synthesis of Titanium ĸ<sup>1</sup><i>S</i>‐Thioamidato Complexes from Reactions of Bis(pentafulvene)complexes with Isothiocyanates
Synthesis of Titanium ĸ<sup>1</sup><i>S</i>‐Thioamidato Complexes from Reactions of Bis(pentafulvene)complexes with Isothiocyanates Open
As part of the activation of small molecules by transition metal complexes, reactions of bis(π‐η 5 :σ‐η 1 ‐pentafulvene)titanium complexes with various isothiocyanates are performed. Despite the presence of two double bonds, only the CS b…
View article: Exploring the Reactivity of Germole Dianions with Aluminum Trichloride: Uncovering Versatile Pathways
Exploring the Reactivity of Germole Dianions with Aluminum Trichloride: Uncovering Versatile Pathways Open
The reactivity analysis of dipotassiumgermoldiides K 2 [1] with aluminum trichloride in the presence of donors uncovers an unexpectedly broad range of products. The specific product formed varies, based on the donor's characteristics, its …
View article: Investigations into Intramolecular Cerium‐ and Manganese‐Catalyzed Aerobic Coupling of β‐Oxoesters with Styryl Moieties
Investigations into Intramolecular Cerium‐ and Manganese‐Catalyzed Aerobic Coupling of β‐Oxoesters with Styryl Moieties Open
Bicyclic diketones and lactones are obtained in up to 60 % yield in the aerobic, manganese‐catalyzed intramolecular radical cyclization of β‐oxoesters with a six‐membered ring and phenyl or diphenyl allyl substituents in the γ‐position. In…
View article: Tuning Lewis Acidity: Design of Titanium Complexes with hemilabile Pyridine‐based Ligands
Tuning Lewis Acidity: Design of Titanium Complexes with hemilabile Pyridine‐based Ligands Open
The formation of titanium(IV) complexes with Cp , N , N and Cp , O , N tridentate ligands via insertion of the pyridine‐containing precursors into the pentafulvene moiety of the titanium complexes is reported. After consecutive methylation…
View article: Synthesis and exploration of a 1 <i>H</i> -germol-1-ide/pyridine bidentate ligand
Synthesis and exploration of a 1 <i>H</i> -germol-1-ide/pyridine bidentate ligand Open
A new bidentate ligand designed by the combination of a germacyclopentadiene group and an amidopyridinato substituent and its homoleptic complexes with Ge( ii ) and Sn( ii ) are presented.
View article: Synthesis, characterization and functionalization of titanium κ <sup>1</sup> <i>N</i> amidinato complexes from carbodiimides
Synthesis, characterization and functionalization of titanium κ <sup>1</sup> <i>N</i> amidinato complexes from carbodiimides Open
A series of titanium amidinato complexes were synthesized by stoichiometric insertion reactions of carbodiimides into bis(π–η 5 :σ–η 1 -pentafulvene)titanium complexes.
View article: Synthesis of Optically Active Spirocycles by a Sequence of Decarboxylative Asymmetric Allylic Alkylation and Heck Reaction
Synthesis of Optically Active Spirocycles by a Sequence of Decarboxylative Asymmetric Allylic Alkylation and Heck Reaction Open
Optically active spirocycles were prepared in a sequence of two palladium-catalyzed reactions. In the first step, racemic α-(ortho-iodophenyl)-β-oxo allyl esters were submitted to the palladium-catalyzed decarboxylative asymmetric allylic …
View article: An Optically Active 4‐Aryl‐3,4‐dihydroisocoumarin‐3‐carboxylate
An Optically Active 4‐Aryl‐3,4‐dihydroisocoumarin‐3‐carboxylate Open
A four step sequence for the preparation of optically active ( R , R )‐ethyl 4‐phenyl‐3,4‐dihydroisocoumarin‐3‐carboxylate is reported. In the first step the first stereocenter was installed by palladium catalyzed asymmetric conjugate addi…
View article: From Coordination to Noncoordination: Syntheses and Substitution Lability Studies of Titanium Triflato Complexes
From Coordination to Noncoordination: Syntheses and Substitution Lability Studies of Titanium Triflato Complexes Open
A new concept for obtaining cationic complexes with triflate counteranions from coordinating triflato ligands was developed. Various routes are leading to titanium(IV) and titanium(III) triflato complexes efficiently. The reactions of pent…
View article: Syntheses, Characterization, and Redox Activity of Ferrocene-Containing Titanium Complexes
Syntheses, Characterization, and Redox Activity of Ferrocene-Containing Titanium Complexes Open
The chemistry of bis(π-η5:σ-η1-pentafulvene)titanium complexes is characterized by a broad range of E-H activation and Ti-C functionalization reactions, whereas ferrocene derivatives are easily accessible and redox-active compounds. The re…
View article: Aluminagerma[5]pyramidanes—Formation and Skeletal Rearrangement
Aluminagerma[5]pyramidanes—Formation and Skeletal Rearrangement Open
The salt metathesis reaction of dipotassium germacyclopentadienediide with aluminum(III) dichlorides provides either half‐sandwich alumole complexes of germanium(II) or aluminylene germole complexes. Their molecular structure and the deloc…
View article: Selective Manipulation of Well‐Defined Trinuclear Pd(II)‐Complexes
Selective Manipulation of Well‐Defined Trinuclear Pd(II)‐Complexes Open
Several strategies are available to design well‐defined multimetallic molecular entities bearing functional ligands. Substoichiometric exchange reactions in the coordination sphere of pre‐existing multinuclear precursors are relatively und…
View article: Syntheses, Characterization, and Multifaceted Coordination Chemistry of Hydrazonido Titanium Complexes
Syntheses, Characterization, and Multifaceted Coordination Chemistry of Hydrazonido Titanium Complexes Open
The reaction of hydrazones with bis(π-η5:σ-η1-pentafulvene)titanium complexes leads to both hydrazonido and hydrazido complexes depending on the interaction of the hydrazone with the fulvene ligand of the metal complex. The molecular struc…
View article: CCDC 2326473: Experimental Crystal Structure Determination
CCDC 2326473: 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: Phospha-bicyclohexene-germylenes exhibiting unexpected reactivity
Phospha-bicyclohexene-germylenes exhibiting unexpected reactivity Open
Featuring mostly nucleophilic but also electrophilic properties, phosphorus-bridged bicyclic germylenes require steric shielding to be protected from decomposition. The two nucleophilic sites, Ge and P, show competing reactivity.
View article: A Bis(silylene)silole – synthesis, properties and reactivity
A Bis(silylene)silole – synthesis, properties and reactivity Open
The combination of a Si( ii )–Si( iv )–Si( ii ) unit with a silole ring leads to a significant bathochromic shift in its UV-spectra.
View article: Syntheses and coordination chemistry of thiosemicarbazone-based titanium complexes
Syntheses and coordination chemistry of thiosemicarbazone-based titanium complexes Open
The formation of neutral and ionic thiosemicarbazone-based titanium complexes is reported.
View article: Metal ion-driven formation of 2<i>H</i>-silolides and -germolides
Metal ion-driven formation of 2<i>H</i>-silolides and -germolides Open
The rearrangement of anionic silole and germole derivatives to give the corresponding cyclic sila- and germavinyl anions is reported.
View article: CCDC 123414: Experimental Crystal Structure Determination
CCDC 123414: 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 123415: Experimental Crystal Structure Determination
CCDC 123415: 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: Syntheses and Characterization of Ti(III)/Ti(IV) Triazenido Complexes
Syntheses and Characterization of Ti(III)/Ti(IV) Triazenido Complexes Open
The syntheses of side‐on Ti(III) triazenido complexes via the ethylene complexes Cp*Ti(η 2 ‐C 2 H 4 )(η 5 ‐C 5 H 4 CR 2 H) and side‐on Ti(IV) triazenido complexes via bis(π‐η 5 : σ‐η 1 ‐pentafulvene) titanium complexes are reported. The de…
View article: CCDC 2310875: Experimental Crystal Structure Determination
CCDC 2310875: 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 2310873: Experimental Crystal Structure Determination
CCDC 2310873: 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 2310874: Experimental Crystal Structure Determination
CCDC 2310874: 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 2299395: Experimental Crystal Structure Determination
CCDC 2299395: 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 …