Published journal articles

2023

The double cluster compound [Nb₆Cl₁₄(MeCN)₄][Nb₆Cl₁₄(pyz)₄]·6MeCN (Me: methyl, pyz: pyrazine) with a layered structure resulting from weak intermolecular interactions

Eric Sperlich und Martin Köckerling *

Z. Naturforsch. B 2023, DOI: 10.1515/znb-2023-0001

The Suzuki−Miyaura Cross-Coupling−Claisen Rearrangement−Cross-Metathesis Approach to Prenylated Isoflavones

George Kwesiga, Julia Greese, Alexandra Kelling, Eric Sperlich, and Bernd Schmidt*

J. Org. Chem.2023, DOI: 10.1021/acs.joc.2c02698

Total Synthesis of Arylnaphthalene Lignans via a Photochemical Key Step

Pablo Wessig*, Dominik Badetko, Lukas Wichterich, Eric Sperlich, Alexandra Kelling

Eur. J. Org. Chem. 2023, 26, e202201234. DOI: 10.1002/ejoc.202201234

BODIPY-Equipped Benzo-Crown-Ethers as Fluorescent Sensors for pH Independent Detection of Sodium and Potassium Ions

Tobias Sprenger, Dr. Thomas Schwarze*, Holger Müller, Dr. Eric Sperlich, Alexandra Kelling, Prof. Dr. Hans-Jürgen Holdt, Jérôme Paul, Dr. Vera Martos Riaño, Dr. Marc Nazaré

ChemPhotoChem 2022, e202200270. DOI: 10.1002/cptc.202200270

2022

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Mixed chloridometallate(II) ionic liquids with tunable color and optical response for potential ammonia sensors

Karsten Behrens, Christian Balischewski, Eric Sperlich, Antonia Menski, Ruth Fabiola Balderas-Valadez, Claudia Pacholski, Christina Günter, Susanne Lubahn, Alexandra Kelling and Andreas Taubert*

RSC Adv., 2022, 12, 35072-35082, DOI: 10.1039/D2RA05581C

Intraligand Charge Transfer Enables Visible-Light-Mediated Nickel-Catalyzed Cross-Coupling Reactions

Cristian Cavedon, Sebastian Gisbertz, Susanne Reischauer, Sarah Vogl, Eric Sperlich, John H. Burke, Rachel F. Wallick, Stefanie Schrottke, Wei-Hsin Hsu, Lucia Anghileri, Yannik Pfeifer, Noah Richter, Christian Teutloff, Henrike Müller-Werkmeister, Dario Cambié, Peter H. Seeberger, Josh Vura-Weis, Renske M. van der Veen*, Arne Thomas*, Bartholomäus Pieber*

Angew. Chem.Int. Ed. 2022, 61, e20221143. DOI: 10.1002/anie.202211433

Tetrahalidometallate(II) Ionic Liquids with More than One Metal: The Effect of Bromide versus Chloride

Christian Balischewski, Dr. Biswajit Bhattacharyya, Dr. Eric Sperlich, Dr. Christina Günter, Alkit Beqiraj, Prof. Dr. Tillmann Klamroth, Dr. Karsten Behrens, Stefan Mies, Alexandra Kelling, Susanne Lubahn, Lea Holtzheimer, Anne Nitschke, Prof. Dr. Andreas Taubert*

Chem. Eur. J. 2022, e202201068. DOI: 10.1002/chem.202201068

Bromination of eudesmin isolated from araucaria araucana induces epimerization and give bromine derivatives with loss of anti-Candida activity

Gastón Bravo-Arrepol, José Becerra, Leandro Ortiz, Jaime Cabrera-Pardo, Bernd Schmidt, Matthias Heydenreich, Alexandra Kelling, Eric Sperlich, Tomasz M. Karpiński, and Cristian Paz

Nat. Prod. Res.2022, DOI: 10.1080/14786419.2022.2089140

Intermolecular interactions in the solid-state structures of isoflavones: the relationship between supramolecular structure, torsion angle, and macroscopic properties

Eric Sperlich*, Alexandra Kelling, George Kwesiga and Bernd Schmidt

CrystEngComm, 2022, 24, 4731 - 4739. DOI: 10.1039/D2CE00169A

Studies toward the Total Synthesis of Arylnaphthalene Lignans via a Photo-Dehydro-Diels–Alder (PDDA) Reaction

Pablo Wessig*, Dominik Badetko, Maciej Czarnecki, Lukas Wichterich, Peter Schmidt, Cosima Brudy, Eric Sperlich, and Alexandra Kelling

J. Org. Chem.2022, DOI: 10.1021/acs.joc.2c00195

[Nb₆Cl₁₄(pyrazine)₄], a Versatile Precursor for Ligand-Supported Hexanuclear Niobium Cluster Compounds: Synthesis, Characterization, Follow-Up Reactions, and Intermolecular Interactions

Eric Sperlich and Martin Köckerling*

Inorg. Chem.2022. DOI: 10.1021/acs.inorgchem.1c03109

2021

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Photo: Eric Sperlich

[Nb₆Cl₁₂(CH₃OH)₄(OCH₃)₂] ⋅ DABCO ⋅ 1.66 CH₂Cl₂: Cluster Units Wrapped in a Network of Hydrogen Bonds

Dr. Eric Sperlich, Prof. Dr. Martin Köckerling*

Inorg. Chem. 2022, 61, 5, 2409–2420. DOI: 10.1021/acs.inorgchem.1c03109

Photo: Eric Sperlich

Scope and Applications of 2,3-Oxidative Aryl Rearrangements for the Synthesis of Isoflavone Natural Products

George Kwesiga, Eric Sperlich, and Bernd Schmidt*

J. Org. Chem. 2021, 86, 15, 10699–10712. DOI: 10.1021/acs.joc.1c01375

Birch Reduction of Arenes as an Easy Entry to γ-Spirolactones

Tobias Krüger, Dr. Andrea Bramborg, Alexandra Kelling, Dr. Eric Sperlich, Prof. Dr. Torsten Linker*

Eur. J. Org.Chem. 2021, 6383– 6391. DOI: 10.1002/ejoc.202101018

Influence of Regioisomerism in 9-Anthracenyl-Substituted Dithiodicyanoethene Derivatives on Photoinduced Electron Transfer Controlled By Intramolecular Charge Transfer

Dr. Thomas Schwarze*, Alexandra Kelling, Dr. Eric Sperlich, Prof. Dr. Hans-Jürgen Holdt

ChemPhotoChem 2021, 5, 911– 914. DOI: 10.1002/cptc.202100070

Cluster Salts [Nb₆Cl₁₂(HIm)₆]An (with HIm = 1H‐imidazole and A = Mineral Acid Anion, n = 1 or 2) Made in and with Brønsted‐basic Ionic Liquids and Liquid Mixtures

Dr. Eric Sperlich and Prof. Dr. Martin Köckerling*

ChemistryOpen 2021, 10(2): 248–254. DOI: 10.1002/open.202000266

Synthesis Efforts of Acyclic Bis(monoalkylamino)maleonitriles and Macrocyclic Bis(dialkylamino)maleonitriles as Fluorescent Probes for Cations and a New Colorimetric Copper(II) Chemodosimeter

Thomas Schwarze*, Eric Sperlich, Thomas Müller, Alexandra Kelling, Hans-Jürgen Holdt

Helv. Chim. Acta 2021, 104, e21000. DOI: 10.1002/hlca.202100028

Matsuda–Heck arylation of itaconates: a versatile approach to heterocycles from a renewable resource

Andreas Krause, Eric Sperlich and Bernd Schmidt*

Org. Biomol. Chem. 2021, 19, 4292-4302. DOI: 10.1039/D1OB00392E

Influence of Functional Groups on the Ene Reaction of Singlet Oxygen with 1,4-Cyclohexadienes

Werner Fudickar, Melanie Metz, Yasemin Mai-Linde, Tobias Krüger, Alexandra Kelling, Eric Sperlich, Torsten Linker*

Photochem. Photobiol. 2021. DOI: 10.1111/php.13422

Sulfur Tuning of [1,3]-Dioxolo[4.5-f]benzodioxole (DBD) Fluorescent Dyes

Prof. Dr. Pablo Wessig*, Leonard John, Eric Sperlich, Alexandra Kelling

Eur. J. Org. Chem. 2021, 499–511. DOI: 10.1002/ejoc.202001418

2020

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Cation-anion pairs of niobium clusters of the type [Nb₆Cl₁₂(RCN)₆][Nb₆Cl₁₈] (R=Et, nPr, iPr) with nitrile ligands RCN forming stabilizing inter-ionic contacts

Eric Sperlich und Martin Köckerling*

Z. Naturforsch., B 2020, 75(1-2), 173–181. DOI: 10.1515/znb-2019-0177

Total Syntheses of Prenylated Isoflavones from Erythrina sacleuxii and Their Antibacterial Activity: 5-Deoxy-3′-prenylbiochanin A and Erysubin F

George Kwesiga, Alexandra Kelling, Sebastian Kersting, Eric Sperlich, Markus von Nickisch-Rosenegk, and Bernd Schmidt*

J. Nat. Prod. 2020, 83, 11, 3445–3453. DOI: 10.1021/acs.jnatprod.0c00932

Hexanuclear Niobium Cluster Compounds with Protonated N-Base Cations

Jonas König, Ina Dartsch, Eric Sperlich, Eva Guillamón, Rosa Llusar, Martin Köckerling

Z. Anorg. Allg. Chem. 2020, 646, 1531–1538. DOI: 10.1002/zaac.202000097

Ionic Liquids with More than One Metal: Optical and Electrochemical Properties versus d‐Block Metal Combinations

Christian Balischewski, Dr. Karsten Behrens, Dr. Kerstin Zehbe, Dr. Christina Günter, Stefan Mies, Dr. Eric Sperlich, Alexandra Kelling, and Prof. Dr. Andreas Taubert*

Chemistry 2020, 26(72), 17504–17513. DOI: 10.1002/chem.202003097

before 2020

Discrete Neutral Niobium Cluster Units in Compounds of the Type [Nb₆Cl₁₄L₄] with L = O or N Donor Ligand

Eric Sperlich, Jonas König, Daniel Holger Weiß, Florian Schröder, Martin Köckerling*

Z. Anorg. Allg. Chem. 2019, 645, 233–241. DOI: 10.1002/zaac.201800416

[Nb₆Cl₁₂(HIm)₆](OAc)₂·3MeOH – a hydrogen-bonded network of niobium cluster cations, acetate anions and methanol molecules

Eric Sperlich und Martin Köckerling*

Z. Naturforsch., B 2019, 74, 751–755. DOI: 10.1515/znb-2019-0124

(C₇H₆NS)₂[Nb₆Cl₁₈] · 2 C₄H₈O: first niobium cluster with an N,S-heterocyclic cation

E. Sperlich and M. Köckerling*

IUCrData 2018, 3, x181760. DOI: 10.1107/S2414314618017601

The double cluster compound [Nb6Cl14(MeCN)4][Nb6Cl14(pyz)4]·6MeCN (Me: methyl, pyz: pyrazine) with a layered structure resulting from weak intermolecular interactions

The Suzuki−Miyaura Cross-Coupling−Claisen Rearrangement−Cross-Metathesis Approach to Prenylated Isoflavones

Total Synthesis of Arylnaphthalene Lignans via a Photochemical Key Step

BODIPY-Equipped Benzo-Crown-Ethers as Fluorescent Sensors for pH Independent Detection of Sodium and Potassium Ions

Mixed chloridometallate(II) ionic liquids with tunable color and optical response for potential ammonia sensors

Intraligand Charge Transfer Enables Visible-Light-Mediated Nickel-Catalyzed Cross-Coupling Reactions

Tetrahalidometallate(II) Ionic Liquids with More than One Metal: The Effect of Bromide versus Chloride

Bromination of eudesmin isolated from araucaria araucana induces epimerization and give bromine derivatives with loss of anti-Candida activity

Intermolecular interactions in the solid-state structures of isoflavones: the relationship between supramolecular structure, torsion angle, and macroscopic properties

Studies toward the Total Synthesis of Arylnaphthalene Lignans via a Photo-Dehydro-Diels–Alder (PDDA) Reaction

[Nb6Cl14(pyrazine)4], a Versatile Precursor for Ligand-Supported Hexanuclear Niobium Cluster Compounds: Synthesis, Characterization, Follow-Up Reactions, and Intermolecular Interactions

[Nb6Cl12(CH3OH)4(OCH3)2] ⋅ DABCO ⋅ 1.66 CH2Cl2: Cluster Units Wrapped in a Network of Hydrogen Bonds

Scope and Applications of 2,3-Oxidative Aryl Rearrangements for the Synthesis of Isoflavone Natural Products

Birch Reduction of Arenes as an Easy Entry to γ-Spirolactones

Influence of Regioisomerism in 9-Anthracenyl-Substituted Dithiodicyanoethene Derivatives on Photoinduced Electron Transfer Controlled By Intramolecular Charge Transfer

Cluster Salts [Nb6Cl12(HIm)6]An (with HIm = 1H‐imidazole and A = Mineral Acid Anion, n = 1 or 2) Made in and with Brønsted‐basic Ionic Liquids and Liquid Mixtures

Synthesis Efforts of Acyclic Bis(monoalkylamino)maleonitriles and Macrocyclic Bis(dialkylamino)maleonitriles as Fluorescent Probes for Cations and a New Colorimetric Copper(II) Chemodosimeter

Matsuda–Heck arylation of itaconates: a versatile approach to heterocycles from a renewable resource

Influence of Functional Groups on the Ene Reaction of Singlet Oxygen with 1,4-Cyclohexadienes

Sulfur Tuning of [1,3]-Dioxolo[4.5-f]benzodioxole (DBD) Fluorescent Dyes

Cation-anion pairs of niobium clusters of the type [Nb6Cl12(RCN)6][Nb6Cl18] (R=Et, nPr, iPr) with nitrile ligands RCN forming stabilizing inter-ionic contacts

Total Syntheses of Prenylated Isoflavones from Erythrina sacleuxii and Their Antibacterial Activity: 5-Deoxy-3′-prenylbiochanin A and Erysubin F

Hexanuclear Niobium Cluster Compounds with Protonated N-Base Cations

Ionic Liquids with More than One Metal: Optical and Electrochemical Properties versus d‐Block Metal Combinations

Discrete Neutral Niobium Cluster Units in Compounds of the Type [Nb6Cl14L4] with L = O or N Donor Ligand

[Nb6Cl12(HIm)6](OAc)2·3MeOH – a hydrogen-bonded network of niobium cluster cations, acetate anions and methanol molecules

(C7H6NS)2[Nb6Cl18] · 2 C4H8O: first niobium cluster with an N,S-heterocyclic cation

The double cluster compound [Nb₆Cl₁₄(MeCN)₄][Nb₆Cl₁₄(pyz)₄]·6MeCN (Me: methyl, pyz: pyrazine) with a layered structure resulting from weak intermolecular interactions

[Nb₆Cl₁₄(pyrazine)₄], a Versatile Precursor for Ligand-Supported Hexanuclear Niobium Cluster Compounds: Synthesis, Characterization, Follow-Up Reactions, and Intermolecular Interactions

[Nb₆Cl₁₂(CH₃OH)₄(OCH₃)₂] ⋅ DABCO ⋅ 1.66 CH₂Cl₂: Cluster Units Wrapped in a Network of Hydrogen Bonds

Cluster Salts [Nb₆Cl₁₂(HIm)₆]An (with HIm = 1H‐imidazole and A = Mineral Acid Anion, n = 1 or 2) Made in and with Brønsted‐basic Ionic Liquids and Liquid Mixtures

Cation-anion pairs of niobium clusters of the type [Nb₆Cl₁₂(RCN)₆][Nb₆Cl₁₈] (R=Et, nPr, iPr) with nitrile ligands RCN forming stabilizing inter-ionic contacts

Discrete Neutral Niobium Cluster Units in Compounds of the Type [Nb₆Cl₁₄L₄] with L = O or N Donor Ligand

[Nb₆Cl₁₂(HIm)₆](OAc)₂·3MeOH – a hydrogen-bonded network of niobium cluster cations, acetate anions and methanol molecules

(C₇H₆NS)₂[Nb₆Cl₁₈] · 2 C₄H₈O: first niobium cluster with an N,S-heterocyclic cation