Koszinowski, Konrad

[["dc.bibliographiccitation.artnumber","anie.202210211"],["dc.bibliographiccitation.issue","43"],["dc.bibliographiccitation.journal","Angewandte Chemie International Edition"],["dc.bibliographiccitation.volume","61"],["dc.contributor.affiliation","Kreyenschmidt, Friedrich; 1\r\nInstitut für Organische und Biomolekulare Chemie\r\nUniversität Göttingen\r\nTammannstraße 2 37077 Göttingen Germany"],["dc.contributor.affiliation","Eisele, Niklas F.; 1\r\nInstitut für Organische und Biomolekulare Chemie\r\nUniversität Göttingen\r\nTammannstraße 2 37077 Göttingen Germany"],["dc.contributor.affiliation","Hevelke, Valentin; 1\r\nInstitut für Organische und Biomolekulare Chemie\r\nUniversität Göttingen\r\nTammannstraße 2 37077 Göttingen Germany"],["dc.contributor.affiliation","Rahrt, Rene; 1\r\nInstitut für Organische und Biomolekulare Chemie\r\nUniversität Göttingen\r\nTammannstraße 2 37077 Göttingen Germany"],["dc.contributor.affiliation","Kreyenschmidt, Anne‐Kathrin; 2\r\nInstitut für Anorganische Chemie\r\nUniversität Göttingen\r\nTammannstraße 4 37077 Göttingen Germany"],["dc.contributor.affiliation","Koszinowski, Konrad; 1\r\nInstitut für Organische und Biomolekulare Chemie\r\nUniversität Göttingen\r\nTammannstraße 2 37077 Göttingen Germany"],["dc.contributor.author","Kreyenschmidt, Friedrich"],["dc.contributor.author","Eisele, Niklas F."],["dc.contributor.author","Hevelke, Valentin"],["dc.contributor.author","Rahrt, Rene"],["dc.contributor.author","Kreyenschmidt, Anne‐Kathrin"],["dc.contributor.author","Koszinowski, Konrad"],["dc.date.accessioned","2022-11-28T09:40:41Z"],["dc.date.available","2022-11-28T09:40:41Z"],["dc.date.issued","2022-09-26"],["dc.date.updated","2022-11-27T10:11:07Z"],["dc.description.abstract","Abstract\r\nAnionic coordination polymerizations proceed via highly reactive intermediates, whose in situ analysis has remained difficult. Here, we show that electrospray‐ionization mass spectrometry is a promising method to obtain detailed information on the polymerization process. Focusing on polymerization reactions of 1,3‐dienes initiated by CoCl2/RLi (R=Me, nBu, tBu, Ph), we directly observe the growing polymer chains and characterize the active anionic cobalt centers by gas‐phase fragmentation experiments. On the basis of these results, we suggest a plausible mechanism for the polymerization reaction. Moreover, the ESI mass spectra permit the determination of molecular weight distributions, which are in good agreement with those derived from NMR‐spectroscopic as well as MALDI mass‐spectrometric measurements, and afford a wealth of kinetic data."],["dc.description.abstract","Negative‐ion mode ESI mass spectrometry permits the direct observation of anionic polymers resulting from the reaction of 1,3‐dienes with CoCl2 and organolithium reagents.\r\n\r\nimage"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659"],["dc.identifier.doi","10.1002/anie.202210211"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/117297"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-597"],["dc.relation.eissn","1521-3773"],["dc.relation.issn","1433-7851"],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes."],["dc.rights.uri","http://onlinelibrary.wiley.com/termsAndConditions#vor"],["dc.title","In‐Situ Analysis of Anionic Coordination Polymerizations by Electrospray‐Ionization Mass Spectrometry"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5912"],["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Chemistry – A European Journal"],["dc.bibliographiccitation.lastpage","5921"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Kreyenschmidt, Friedrich"],["dc.contributor.author","Meurer, Selim E."],["dc.contributor.author","Koszinowski, Konrad"],["dc.date.accessioned","2020-12-10T14:05:53Z"],["dc.date.available","2020-12-10T14:05:53Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1002/chem.v25.23"],["dc.identifier.eissn","1521-3765"],["dc.identifier.issn","0947-6539"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69694"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Mechanisms of Cobalt/Phosphine‐Catalyzed Cross‐Coupling Reactions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3139"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Chemistry - A European Journal"],["dc.bibliographiccitation.lastpage","3151"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Bueschelberger, Philipp"],["dc.contributor.author","Gaertner, Dominik"],["dc.contributor.author","Reyes-Rodriguez, Efrain"],["dc.contributor.author","Kreyenschmidt, Friedrich"],["dc.contributor.author","Koszinowski, Konrad"],["dc.contributor.author","Jacobi von Wangelin, Axel"],["dc.contributor.author","Wolf, Robert"],["dc.date.accessioned","2018-11-07T10:26:29Z"],["dc.date.available","2018-11-07T10:26:29Z"],["dc.date.issued","2017"],["dc.description.abstract","First-row transition-metal complexes hold great potential as catalysts for hydrogenations and related reductive reactions. Homo-and heteroleptic arene/alkene metalates(1-) (M=Co, Fe) are a structurally distinct catalyst class with good activities in hydrogenations of alkenes and alkynes. The first syntheses of the heteroleptic cobaltates [K([18]crown-6)][Co(eta(4)-cod)(eta(2)-styrene)(2)] (5) and [K([18]crown-6)][Co(eta(4)-dct)(eta(4)-cod)] (6), and the homoleptic complex [K(thf)(2)][Co(eta(4)-dct)(2)] (7; dct=dibenzo[a,e]cyclooctatetraene, cod=1,5-cyclooctadiene), are reported. For comparison, two cyclopentadienylferrates(1-) were synthesized according to literature procedures. The isolated and fully characterized monoanionic complexes were competent precatalysts in alkene hydrogenations under mild conditions (2 bar H-2, r. t., THF). Mechanistic studies by NMR spectroscopy, ESI mass spectrometry, and poisoning experiments documented the operation of a homogeneous mechanism, which was initiated by facile redox-neutral pi-ligand exchange with the substrates followed by H-2 activation. The substrate scope of the investigated precatalysts was also extended to polar substrates (ketones and imines)."],["dc.identifier.doi","10.1002/chem.201605222"],["dc.identifier.isi","000395774700022"],["dc.identifier.pmid","28026060"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43054"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1521-3765"],["dc.relation.issn","0947-6539"],["dc.title","Alkene Metalates as Hydrogenation Catalysts"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","43"],["dc.bibliographiccitation.journal","Angewandte Chemie"],["dc.bibliographiccitation.volume","134"],["dc.contributor.affiliation","Kreyenschmidt, Friedrich; 1\nInstitut für Organische und Biomolekulare Chemie\nUniversität Göttingen\nTammannstraße 2 37077 Göttingen Deutschland"],["dc.contributor.affiliation","Eisele, Niklas F.; 1\nInstitut für Organische und Biomolekulare Chemie\nUniversität Göttingen\nTammannstraße 2 37077 Göttingen Deutschland"],["dc.contributor.affiliation","Hevelke, Valentin; 1\nInstitut für Organische und Biomolekulare Chemie\nUniversität Göttingen\nTammannstraße 2 37077 Göttingen Deutschland"],["dc.contributor.affiliation","Rahrt, Rene; 1\nInstitut für Organische und Biomolekulare Chemie\nUniversität Göttingen\nTammannstraße 2 37077 Göttingen Deutschland"],["dc.contributor.affiliation","Kreyenschmidt, Anne‐Kathrin; 2\nInstitut für Anorganische Chemie\nUniversität Göttingen\nTammannstraße 4 37077 Göttingen Deutschland"],["dc.contributor.affiliation","Koszinowski, Konrad; 1\nInstitut für Organische und Biomolekulare Chemie\nUniversität Göttingen\nTammannstraße 2 37077 Göttingen Deutschland"],["dc.contributor.author","Kreyenschmidt, Friedrich"],["dc.contributor.author","Eisele, Niklas F."],["dc.contributor.author","Hevelke, Valentin"],["dc.contributor.author","Rahrt, Rene"],["dc.contributor.author","Kreyenschmidt, Anne‐Kathrin"],["dc.contributor.author","Koszinowski, Konrad"],["dc.date.accessioned","2022-11-28T09:42:35Z"],["dc.date.available","2022-11-28T09:42:35Z"],["dc.date.issued","2022-09-26"],["dc.date.updated","2022-11-27T10:11:16Z"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659"],["dc.identifier.doi","10.1002/ange.202210211"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/117306"],["dc.language.iso","en"],["dc.publisher",""],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes."],["dc.rights",""],["dc.title","In‐Situ‐Analyse Anionischer Koordinationspolymerisationen durch Elektrosprayionisations‐Massenspektrometrie"],["dc.type","journal_article"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1168"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Chemistry - A European Journal"],["dc.bibliographiccitation.lastpage","1177"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Kreyenschmidt, Friedrich"],["dc.contributor.author","Koszinowski, Konrad"],["dc.date.accessioned","2020-12-10T14:05:49Z"],["dc.date.available","2020-12-10T14:05:49Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1002/chem.201704547"],["dc.identifier.issn","0947-6539"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69663"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Low-Valent Ate Complexes Formed in Cobalt-Catalyzed Cross-Coupling Reactions with 1,3-Dienes as Additives"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]