Zobrazeno 1 - 10 of 21 pro vyhledávání: '"Roman Neufeld"'
1
Solution Structures of Hauser Base iPr2NMgCl and Turbo-Hauser Base iPr2NMgCl·LiCl in THF and the Influence of LiCl on the Schlenk-Equilibrium
Autor: Thorsten L. Teuteberg, Dietmar Stalke, Ricardo A. Mata, Regine Herbst-Irmer, Roman Neufeld
Publikováno v: Journal of the American Chemical Society. 138:4796-4806
Grignard reagents that are at the simplest level described as "RMgX" (where R is an organic substituent and X a halide) are one of the most widely utilized classes of synthetic reagents. Lately, especially Grignard reagents with amido ligands of the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4387715105ec2872c0df7022d840b3e7
https://doi.org/10.1021/jacs.6b00345
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2
The Donor-Base-Free Aggregation of Lithium Diisopropyl Amide in Hydrocarbons Revealed by a DOSY Method
Autor: Dietmar Stalke, Michael John, Roman Neufeld
Publikováno v: Angewandte Chemie International Edition. 54:6994-6998
Lithium diisopropyl amide (LDA) is a very prominent reagent that plays a key role in organic synthesis, serving as a base par excellence for a broad range of deprotonation reactions. However, the state of aggregation in solution in the absence of don
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d5d4bb08a93e6c0dffa4df868e360ce
https://doi.org/10.1002/anie.201502576
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3
Aufklärung der donorbasenfreien Aggregation von Lithiumdiisopropylamid in Kohlenwasserstoffen mithilfe einer DOSY-Methode
Autor: Michael John, Dietmar Stalke, Roman Neufeld
Publikováno v: Angewandte Chemie. 127:7100-7104
Lithiumdiisopropylamid (LDA) ist ein uberaus wichtiges Reagens und nimmt vor allem in der organischen Synthesechemie eine Schlusselrolle bei einer Vielzahl von Deprotonierungsreaktionen ein. Trotzdem ist seine Aggregation, und damit die Gestalt der r
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::993791c4c1edb8ddd527168782fa8f2d
https://doi.org/10.1002/ange.201502576
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4
Cr(i)Cl as well as Cr+are stabilised between two cyclic alkyl amino carbenes
Autor: Jonathan H. Christian, Naresh S. Dalal, Pattiyil Parameswaran, Franc Meyer, Regine Herbst-Irmer, Serhiy Demeshko, Susmita De, A. Claudia Stückl, Wolfgang Kaim, Jasleen K. Bindra, Kartik Chandra Mondal, Vallyanga Chalil Rojisha, Dietmar Stalke, Prinson P. Samuel, Roman Neufeld, Herbert W. Roesky
Publikováno v: Chemical Science. 6:3148-3153
Cr(I)Cl is a very unstable species. The present work describes the stabilisation of Cr(I)Cl in the low coordinate environment of cyclic alkyl(amino) carbene ligands and its synthetic application to yield an unprecedented cationic complex with a two c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d05c4729b221ea3404bda8983c93ad3
https://doi.org/10.1039/c5sc00646e
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6
New External Calibration Curves (ECCs) for the Estimation of Molecular Weights in Various Common NMR Solvents
Autor: Sebastian Bachmann, Dietmar Stalke, Martin Dzemski, Roman Neufeld
Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 22(25)
New external calibration curves (ECCs) for the estimation of aggregation states of small molecules in solution by DOSY NMR spectroscopy for a range of different common NMR solvents ([D6 ]DMSO, C6 D12 , C6 D6 , CDCl3 , and CD2 Cl2 ) are introduced and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8467db114a9e873e43abacef2dd7ebf1
https://pubmed.ncbi.nlm.nih.gov/27061592
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7
Introducing a Hydrogen-Bond Donor into a Weakly Nucleophilic Brønsted Base: Alkali Metal Hexamethyldisilazides (MHMDS, M=Li, Na, K, Rb and Cs) with Ammonia
Autor: Dietmar Stalke, Regine Herbst-Irmer, Reent Michel, Ralf Schöne, Roman Neufeld
Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 22(35)
Alkali metal 1,1,1,3,3,3-hexamethyldisilazide (MHMDSs) are one of the most utilised weakly nucleophilic Bronsted bases in synthetic chemistry and especially in natural product synthesis. Like lithium organics, they aggregate depending on the employed
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b60ffecf56af159c04ae6b5a7d13d9b
https://pubmed.ncbi.nlm.nih.gov/27457218
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8
The Layered Structure of [Na(NH3)4][Indenide] Containing a Square-Planar Na(NH3)4+Cation
Autor: Tobias Nack, Reent Michel, Johannes M. Dieterich, Dietmar Stalke, Ricardo A. Mata, Roman Neufeld
Publikováno v: Angewandte Chemie International Edition. 52:734-738
It's hip to be a square! The ammines [Li(NH(3))(4)][Ind] and [Na(NH(3))(4)][Ind] both contain a cation coordinated by four ammonia molecules. Whereas the first shows the anticipated tetrahedral coordination, in the second the metal coordination is un
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf422d3d80b53d10f36456eaa7bf38b5
https://doi.org/10.1002/anie.201207082
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10
A Pd-Catalyzed Approach to (1→6)-Linked C-Glycosides
Autor: Daniel B. Werz, Markus Leibeling, Dennis C. Koester, Roman Neufeld
Publikováno v: Organic Letters. 12:3934-3937
A flexible and robust method for the assembly of (1--6)-linked C-glycosidic disaccharides is presented. The key reaction is a Pd-catalyzed coupling of 1-iodo- or 1-triflato-glycals with alkynyl glycosides. Reinstallation of the native hydroxyl group
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8466785577ad297c5da77b070b33fb75
https://doi.org/10.1021/ol101625p
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