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Relevant academic research and scientific papers

Peroxo-containing metal complexes having amine oxide, phosphine oxide, arsine oxide, pyridine N-oxide or pyridine ligands as epoxidation catalysts

PCT No. PCT/EP96/03888 Sec. 371 Date Mar. 11, 1998 Sec. 102(e) Date Mar. 11, 1998 PCT Filed Sep. 4, 1996 PCT Pub. No. WO97/10054 PCT Pub. Date Mar. 20, 1997Olefins can be epoxidized using catalysts I where M is a metal of the 4th to 7th transition group of the Periodic Table of the Elements, L1 is an amine oxide, phosphine oxide, arsine oxide, pyridine N-oxide or pyridine ligand of the formula II, III, VII or VIII, L2 is a customary auxiliary ligand or a further ligand L1 or a free coordination site, X is oxo oxygen or an imido ligand, m is 1 or 2, and n is 1, 2 or 3.

Preparation of epoxides from olefins using bis(triorganosilyl) peroxides in the presence of activators based on metallic acid derivatives

PCT No. PCT/EP97/00982 Sec. 371 Date Sep. 2, 1998 Sec. 102(e) Date Sep. 2, 1998 PCT Filed Feb. 28, 1997 PCT Pub. No. WO97/32867 PCT Pub. Date Sep. 12, 1997Epoxides are prepared from olefins using bis(triorganosilyl) peroxides in the presence of activators based on metalic acid derivatives of the formula where M is a metal of transition groups IV to VII, in particular molybdenum, tungsten or rhenium L is an uncharged ligand selected from the group consisting of amine oxides, phosphine oxides, arsine oxides, phosphoric triamides, formamides and pyridine N-oxides X is an inorganic ligand x is from 1 to 5 y is 0, 1 or 2, Z is 1 or 2 and n is 1 or 2.

SYNTHESE ET STRUCTURE D'OXYDES ET DIOXYDES DE PHOSPHINES TERTIAIRES

Tertiary phosphine oxides have been prepared in excellent yield from primary alkyl halides and dihalides or aromatic halides and activated sodium phosphinates obtained by reaction of dialkyl phosphine oxides with complex bases (NaNH2/tBuONa).We have studied by 13C NMR the structure of these compounds.We have reported more particularly the influence of carbon atoms number between the two phosphorus in the case of dioxides and the influence of some parameters such as the temperature and the solvent on the NMR spectra.

Phase transfer catalysis in the chemical modification of polymers. Part III. Preparation of unsymmetrical tertiary phosphine oxides(1)

Unsymmetrical tertiary phosphine oxides have been prepared with excellent yields from a secondary phosphine oxide and an alkyl halide, using phase transfer catalysis.This reaction has been successfuly applied to soluble and cross-linked chloromethylated polystyrenes giving polymers which contain pendant phosphine oxide groups.