Rhenium catalysed epoxidations with hydrogen peroxide: tertiary arsines as effective cocatalysts
作者:Michiel C. A. van Vliet、Isabel W. C. E. Arends、Roger A. Sheldon
DOI:10.1039/a907975k
日期:——
Perrhenic acid in combination with tertiaryarsines gives a versatile catalytic system for epoxidation of alkenes with hydrogen peroxide. The best results are obtained with diphenylmethylarsine. A wide range of alkenes could be epoxidised with aqueous hydrogen peroxide (60%) in 60–100% yields with substrate to catalyst ratios of up to 1000.
Synthesis and Crystal Structure of Tris- [3,5-bis(trifluoromethyl)phenyl]arsine
作者:Pascal D. C. Dietzel、Martin Jansen
DOI:10.1515/znb-2004-0320
日期:2004.3.1
The title compound, As[C6H3(CF3)2]3, has been synthesised by Grignard reaction from arsenic trichloride and 3,5-bis(trifluoromethyl)phenylmagnesium bromide. It crystallises in the triclinic space group P1̅ with two formula units in the asymmetric unit. The most prominent feature of the crystal structure is the protrusion of a phenyl group of one molecule into the cavity at the base of the pyramid of
Tetrachlorocatecholates of triarylarsines have been synthesized as a novel class of pnictogen-mediated Lewis acids. Their Lewis acidities and electronic properties were studied in comparison with the phosphorus and antimony analogues.
that the triphenylarsine ligand can accelerate the reaction rate of Stille coupling. However, other arsine ligands have never been investigated for the Stille coupling reaction so far. In this work, we prepared 13 kinds of C3-symmetrical tertiary arsine ligands and discovered that tri(p-anisyl)arsine is the best ligand for the reaction of tributylvinyltin and p-iodoanisole. The reaction mechanism was
Synthesis, properties and application of electronically-tuned tetraarylarsonium salts as phase transfer catalysts (PTC) for the synthesis of gem -difluorocyclopropanes
作者:Krzysztof Grudzień、Tymoteusz Basak、Michał Barbasiewicz、Tomasz M. Wojciechowski、Michał Fedoryński
DOI:10.1016/j.jfluchem.2017.03.014
日期:2017.5
Preparation of gem-difluorocyclopropane from α-methylstyrene and chlorodifluoromethane was investigated under basic two-phase conditions. Although simple tetraalkylammonium salts appeared uneffective as phase-transfer catalysts (PTC) for this purpose, tetraphenylarsonium chloride displayed moderate activity, and inspired studies of the phenomena. To improve its efficiency we synthesized set of electronically-tuned