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Pablo Redero Thierry Hartung Dr. Jianwei Zhang Dr. Leo D. M. Nicholls Guo Zichen Martin Simon Dr. Christopher Golz Prof. Dr. Manuel Alcarazo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(52):23733-23737
The synthesis of unprecedented BINOL-derived cationic phosphonites is described. Through the use of these phosphanes as ancillary ligands in AuI catalysis, a highly regio- and enantioselective assembly of appropriately designed alkynes into 1-(aryl)benzo[5]carbohelicenes is achieved. The modular synthesis of these ligands and the enhanced reactivity that they impart to AuI-centers after coordination have been found to be the key features that allow an optimization of the reaction conditions until the desired benzo[5]helicenes are obtained with high yield and enantioselectivity. 相似文献
205.
X‐ray spectroscopy for chemistry in the 2‐4 keV energy regime at the XMaS beamline: ionic liquids,Rh and Pd catalysts in gas and liquid environments,and Cl contamination in γ‐Al2O3
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Paul B. J. Thompson Bao N. Nguyen Rachel Nicholls Richard A. Bourne John B. Brazier Kevin R. J. Lovelock Simon D. Brown Didier Wermeille Oier Bikondoa Christopher A. Lucas Thomas P. A. Hase Mark A. Newton 《Journal of synchrotron radiation》2015,22(6):1426-1439
The 2–4 keV energy range provides a rich window into many facets of materials science and chemistry. Within this window, P, S, Cl, K and Ca K‐edges may be found along with the L‐edges of industrially important elements from Y through to Sn. Yet, compared with those that cater for energies above ca. 4–5 keV, there are relatively few resources available for X‐ray spectroscopy below these energies. In addition, in situ or operando studies become to varying degrees more challenging than at higher X‐ray energies due to restrictions imposed by the lower energies of the X‐rays upon the design and construction of appropriate sample environments. The XMaS beamline at the ESRF has recently made efforts to extend its operational energy range to include this softer end of the X‐ray spectrum. In this report the resulting performance of this resource for X‐ray spectroscopy is detailed with specific attention drawn to: understanding electrostatic and charge transfer effects at the S K‐edge in ionic liquids; quantification of dilution limits at the Cl K‐ and Rh L3‐edges and structural equilibria in solution; in vacuum deposition and reduction of [RhI(CO)2Cl]2 to γ‐Al2O3; contamination of γ‐Al2O3 by Cl and its potential role in determining the chemical character of supported Rh catalysts; and the development of chlorinated Pd catalysts in `green' solvent systems. Sample environments thus far developed are also presented, characterized and their overall performance evaluated. 相似文献