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Stereoisomerism of bis(σ-Zincane) Complexes: Evidence for an Intramolecular Pathway

Autor: Mark R. Crimmin, Olga Ekkert, Andrew J. P. White

Publikováno v: Chemistry-A European Journal

The first bis(σ-zincane) complexes, heterotri- metallic species [M(CO)4 (η2 -HZnBDI)2 ], have been prepared (BDI=κ2 -{2,6-(iPr)2 C6 H3 NCMe}2 CH). For M=Cr, a single stereoisomer is observed in solution and the solid-state. For M=Mo and W, cis and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24c03e2d57a1bad13a845abdc21fa6cd
https://doi.org/10.1002/chem.201701207

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Rhodium Catalyzed, Carbon–Hydrogen Bond Directed Hydrodefluorination of Fluoroarenes

Autor: Mark R. Crimmin, Olga Ekkert, Andrew J. P. White, Alisa Rozenfeld, Sebastian D. A. Strudley

Publikováno v: Organometallics. 33:7027-7030

[Cp*RhCl(μ-Cl)]2 is reported as a highly efficient and selective precatalyst for the hydrodefluorination of perfluoroarenes using a hydrocarbon-soluble aluminum dihydride as the terminal reductant. Reactions are directed to cleave a C–F bond adjac

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https://doi.org/10.1021/om501113j

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Solid-state NMR studies for the determination of 11B electric field-gradient tensor orientations in P/B Frustrated Lewis Pairs and related systems

Autor: Juri Möbus, Constantin G. Daniliuc, Thomas Wiegand, Gerald Kehr, Hellmut Eckert, Olga Ekkert, Gerhard Erker, Melanie Siedow

Publikováno v: Solid State Nuclear Magnetic Resonance. :8-14

A solid state NMR method is described for measuring the angle Θ specifying the orientation of the principal component of the 11 B electric field gradient tensor relative to the 11 B … 31 P internuclear vector of 11 B– 31 P spin pairs. It is base

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91ef36faf45c8c8ffefe5649dcbe065d
https://doi.org/10.1016/j.ssnmr.2014.03.002

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Reaction of Unsaturated Vicinal Phosphane/Borane Frustrated Lewis Pairs with Benzaldehyde

Autor: Roland Fröhlich, Jeffrey L. Petersen, Constantin G. Daniliuc, Birgit Wibbeling, Gerhard Erker, Olga Ekkert, Gerald Kehr

Publikováno v: Zeitschrift für anorganische und allgemeine Chemie. 639:2455-2462

Diarylphosphino-substituted alkynes undergo a 1, 1-carboboration reaction with tris(pentafluorophenyl)borane to yield 2-diarylphosphino-substituted alkenylboranes. These unsaturated systems show a P/B interaction. Nevertheless, they feature a limited

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https://doi.org/10.1002/zaac.201300421

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Trajectory of Approach of a Zinc–Hydrogen Bond to Transition Metals

Autor: Andrew J. P. White, Mark R. Crimmin, Olga Ekkert

Publikováno v: Angew. Chem., Int. Ed.

Through a dramatic advance in the coordination chemistry of the zinc-hydride bond, we describe the trajectory for the approach of this bond to transition metals. The dynamic reaction coordinate was interrogated through analysis of a series of solid s

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New Insights into Frustrated Lewis Pairs: Structural Investigations of Intramolecular Phosphane–Borane Adducts by Using Modern Solid-State NMR Techniques and DFT Calculations

Autor: Stefan Grimme, Gerhard Erker, Roland Fröhlich, Olga Ekkert, Hellmut Eckert, Gerald Kehr, Thomas Wiegand

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Covalent bonding interactions between the Lewis acid and Lewis base functionalities have been probed in a series of "frustrated Lewis pairs" (FLPs) (mainly substituted vinylene linked intramolecular phosphane-borane adducts), using solid-state nuclea

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https://doi.org/10.1021/ja210160k

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P−C Bond Activation Chemistry: Evidence for 1,1-Carboboration Reactions Proceeding with Phosphorus−Carbon Bond Cleavage

Autor: Gerhard Erker, Olga Ekkert, Roland Fröhlich, Gerald Kehr

Publikováno v: Journal of the American Chemical Society. 133:4610-4616

A series of diarylphosphinyl-substituted acetylenes of the type (aryl)(2)P-C≡C-R (aryl = phenyl or mesityl, R = Ph or n-propyl) react with the strongly Lewis acid reagent B(C(6)F(5))(3) in toluene at elevated temperatures (70-105 °C) to give the 1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0e38047295a91aff5c9c604bbe04a41
https://doi.org/10.1021/ja1110283

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Reactivity of an intramolecular fluorophosphonium fluoroborate

Autor: Conor Pranckevicius, Douglas W. Stephan, Gerald Kehr, Christopher B. Caputo, Olga Ekkert, Gerhard Erker, Constantin G. Daniliuc

Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 20(36)

The reactions of the intramolecular frustrated Lewis pair-adduct Ph(2) PC(p-Tol)=C(C(6) F(5))B(C(6)F(5))2 (CNtBu) with XeF(2) gave Ph(2)P(F)C(p-Tol)=C(C(6)F(5))B(F)(C(6)F(5))(2)(3). This species reacts with two equivalents of Al(C(6)F(5))(3)⋅C(7)H(

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https://pubmed.ncbi.nlm.nih.gov/25065355

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