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.