Výsledky vyhledávání - "Daniel Weismann"

Stable and Persistent Acyclic Diaminocarbenes with Cycloalkyl Substituents and Their Transformation to β-Lactams by Uncatalysed Carbonylation with CO

Autor: Dennis Löber, Clemens Bruhn, Lars Wallbaum, Daniel Weismann, Julia E. Bandow, Pascal Prochnow, Ulrich Siemeling

Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 25(6)

Four new acyclic diaminocarbenes (ADACs), viz. [(cyclo-Cn H2n-1 )2 N]2 C (n=5-7) and iPr2 N-C-N(cyclo-C6 H11 )2 , were synthesised by reacting the corresponding formamidinium hexafluorophosphates with NaN(SiMe3 )2 . Their nucleophilicities and electr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::641ef46d701663549b06b77bd4aebfbc
https://pubmed.ncbi.nlm.nih.gov/30408240

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New Stable and Persistent Acyclic Diaminocarbenes

Autor: Daniel Weismann, Charlotte Thie, Robin Guthardt, Tim Schulz, Clemens Bruhn, Lars Wallbaum, Michael Leibold, Ulrich Siemeling

Publikováno v: Chemistry – A European Journal. 21:14107-14121

The portfolio of acyclic diaminocarbenes (ADACs) has been substantially expanded, owing to the synthesis of eleven new formamidinium salts, mostly of the type [(iPr2N)CH(NRR')][PF6], for use as immediate carbene precursors. The corresponding ADACs (i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aff9cf482696c199f27503c9cfccff64
https://doi.org/10.1002/chem.201502315

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Iron‐Mediated Coupling of Two Ethyl Anions to Form a 2‐Butyne Ligand

Autor: Helmut Sitzmann, Daniel Weismann, Yu Sun, Gotthelf Wolmershäuser, Heiko Bauer

Publikováno v: European Journal of Inorganic Chemistry. 2014:3072-3084

The σ-aryliron complexes [5CpFe(C6H3iPr2-2,6)] (2, 5Cp = η5-C5iPr5) and [4CpFe(C6H3iPr2-2,6)] (6, 4Cp = η5-C5HiPr4) are available from the halides [5CpFe(μ-Br)]2 (1) and [4CpFe(μ-Br)]2 (4) and have been used for σ/π rearrangement reactions wit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4a88a7b628d45684d0fe730253c5857b
https://doi.org/10.1002/ejic.201402143

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Cyclopentadiene Alkylation and Nickel Complexes with Tri-, Tetra-, or Pentaisopropylcyclopentadienide or an Even Bulkier Lithium Alkylcyclopentadienide

Autor: Daniel Weismann, Yu Sun, Dirk Saurenz, Roland Boese, Gotthelf Wolmershäuser, Dieter Bläser, Helmut Sitzmann

Publikováno v: Organometallics. 30:6351-6364

Phase transfer catalysis has been adapted to the synthesis of triisopropylcyclopentadiene isomers 1 in high yield and purity. Alkylation of sodium triisopropylcyclopentadienides with isopropyl bromide in tetrahydrofuran has been shown to be the curre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2e802b38c7554a7eaa372e38e26d759
https://doi.org/10.1021/om200372j

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Exploring the Concept of Aromaticity on Complexes of a Fourfold Benzannulated Cyclopentadienyl Ligand

Autor: Frank Pammer, Yu Sun, Daniel Weismann, Werner R. Thiel, Helmut Sitzmann

Publikováno v: Chemistry - A European Journal. 16:1265-1270

The ligand dibenzo[c,g]fluorenide (Dbf(-)), combines a cyclopentadienide ligand and 1,1'-binaphthyl fragment in one molecule. Preliminary investigations confirmed the special electronic situation in this 6pi-electron donor by way of a series of novel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4fafc5ba6df742a95146a3ff7208a44f
https://doi.org/10.1002/chem.200902003

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Reactive Sigma-Aryliron Complexes or Iron-Promoted Coupling of Two Phenyl Anions to One Bis(cyclohexadienylidene) Ligand: Synthesis, Structure, Mass Spectrometry, and DFT Calculations

Autor: Christoph Riehn, Daniel Weismann, Helmut Sitzmann, Anita Lagutschenkov, Gereon Niedner-Schatteburg, Gotthelf Wolmershäuser, Stefan Ambrus, Mark W. Wallasch

Publikováno v: Organometallics. 29:806-813

A reaction of the bulky alkylcyclopentadienyliron(II) high-spin complex [Cp′′′Fe(μ-Br)]2 (1a) (Cp′′′ = C5H2(CMe3)3-1,2,4) with phenylmagnesium bromide produced the deep blue dinuclear complex [{Cp′′′Fe}2(μ,η5:η5-H5C6═C6H5)] (2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::76dfc3131c09cd9adc4902ac2e75a9ac
https://doi.org/10.1021/om900870j

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