Showing papers on "Dichlorophenylphosphine published in 2005"

A New Synthesis of (PhPSe2)2 (Woollins Reagent) and Its Use in the Synthesis of Novel P–Se Heterocycles

Abstract: A new and improved method for the preparation of (PhPSe 2 ) 2 (Woollins reagent (WR), 1) is reported. Reaction of dichlorophenylphosphine with Na 2 Se, (prepared from the reaction of elemental selenium and sodium in liquid ammonia) gives WR with excellent purity, high yield and on a larger scale than was previously possible. Four novel phosphorus-selenium heterocycles, including a spirocyclic heterocycle exhibiting a four-membered P 2 SeC ring. were obtained from the reaction of WR with two reactive substrates (diphenylcyclopropenone and methyl phenylpropiolate). Useful selenocarbonyl and thiocarbonyl compounds were obtained from the reaction of both WR and Lawesson's reagent with diphenylcyclopropenone. All new compounds were characterised spectroscopically and three demonstrative X-ray structures are reported.

Synthesis of Dichlorophenylphosphine via a Friedel-Crafts Reaction in [Et4N]Br-XAlCl3 Ionic Liquids

Abstract: The Friedel-Crafts reaction of phosphorus trichloride and benzene in [Et 4 N]Br-XAlCl 3 ([Et 4 N]Br = tetraethylammonium bromide) ionic liquids (ILs) was investigated for the clean synthesis of dichlorophenylphosphine (DCPP). A simple product isolation procedure was achieved, and the effects of IL's composition, reaction time, and quantity on this reaction were studied. The [Et 4 N]Br-XAlCl 3 ILs gave this reaction a green character. From the isolation experiments, it was found that (a) because of the formation of the complex of DCPP and AlCl 3 , the catalytic activity of the [Et 3 NH]Cl-XAlCl 3 ([Et 3 NH]Cl = triethylhydrogenamonium chloride) was reduced; (b) with the addition of quaternary ammonium to the IL's residue, additional DCPP could be recovered.

Development of the Synthesis of Dichlorophenylphosphine

Abstract: The application and prospect of dichlorophenylphosphine dichloride were briefly introduced,and the synthetic method of dichlorophenylphosphine dichloride was also described.The processes of preparing DCPP through AlCl3 catalytic synthesis?ionic liquid catalytic synthesis?free radical addition reaction synthesis,were discussed mainly in aspect of the mechanism of catalytic reaction,the existing problems and the progress of the study on the reaction were also discussed.Finding a new simple synthetic process which is environment benign and is of high yield as well as easy operation is still a hot issue in this field.