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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(47):15188-15192
The first example of base‐metal‐catalysed synthesis of amides from the coupling of primary amines with either alcohols or esters is reported. The reactions are catalysed by a new manganese pincer complex and generate hydrogen gas as the sole byproduct, thus making the overall process atom‐economical and sustainable. 相似文献
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Yang Yang Stephen L. Buchwald 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2014,126(33):8821-8825
A copper‐based catalytic technique for the regioselective ortho C H cyanation of vinylarenes has been developed. This method provides an effective means for the selective functionalization of vinylarene derivatives. A copper‐catalyzed cyanative dearomatization mechanism is proposed to account for the regiochemical course of this reaction. 相似文献
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Dr. Eduard E. Karslyan Dr. Alexandra O. Borissova Prof. Dr. Dmitry S. Perekalin 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(20):5676-5679
A polycyclic aromatic ligand for site-selective metal coordination was designed by using DFT calculations. The computational prediction was confirmed by experiments: 2,3,6,7-tetramethoxy-9,10-dimethylanthracene initially reacts with [(C5H5)Ru(MeCN)3]BF4 to give the kinetic product with a [(C5H5)Ru]+ fragment coordinated at the terminal ring, which is then transformed into the thermodynamic product with coordination through the central ring. These isomeric complexes have markedly different UV/Vis spectra, which was explained by analysis of the frontier orbitals. At the same time, the calculations suggest that electrostatic interactions are mainly responsible for the site selectivity of the coordination. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(19):5351-5355
The development of ligands plays a key role and provides important innovations in homogeneous catalysis. In this context, we report a novel class of ferrocenyl phosphines for the alkoxycarbonylation of industrially important alkenes. A basic feature of our ligands is the combination of sterically hindered and amphoteric moieties on the P atoms, which leads to improved activity and productivity for alkoxycarbonylation reactions compared to the current industrial state‐of‐the‐art ligand 1,2‐bis((di‐tert‐butylphosphino)methyl)benzene). Advantageously, palladium catalysts with these novel ligands also enable such transformations without additional acid under milder reaction conditions. The practicability of the optimized ligand was demonstrated by preparation on >10 g scale and its use in palladium‐catalyzed carbonylations on kilogram scale. 相似文献
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