Celanese Gmbh

Hoechst Aktiengesellschaft

Clariant Corporation

Othmar Stelzer

Norbert Weferling

Klaus-Peter Langhans

Michael Tepper

Helmut Bahrmann

Jurgen Svara

Michael Riedel

Oliver Herd

Gunter Kolbe

Franz Peter Schmidtchen

Harald Dibowski

Antonella Hessler

A description is given of new chiral phosphine ligands containing amino acid groups and having the formula I

Phosphine ligands with amino acid groups, method for their production and use thereof as catalyst components

Guanidinium phosphanes, their production and their use

The invention relates to a process for preparing alkali metal salts and/or alkaline earth metal salts of alkylphosphonous acids and dialkylphosphinic acids from elemental yellow phosphorus and alkyl halides, which comprises carrying out the reaction in the presence of aqueous alkali metal hydroxide or alkaline earth metal hydroxide or mixtures thereof. The invention likewise relates to the use of the compounds prepared by the process according to the invention for preparing flame retardants, extraction media and plant protection agents.

Process for alkylating elemental phosphorus

The invention relates to secondary and tertiary phosphines of the formula ##STR1## in which R is hydrogen, an aryl or benzyl group or a straight-chain or branched alkyl group, n is 1 or 2 and M is potassium or sodium. These phosphines are prepared by reacting either alkali metal salts of fluorobenzene-2,4-disulfonic acid with phosphine or with primary or secondary phosphines, or secondary phosphines of the type HP�C.sub.6 H.sub.3 -2,4-(SO.sub.3 M).sub.2 !.sub.2 with a compound RX in which R is an alkyl, aryl or benzyl group and X is a halogen, in an aprotic solvent in the presence of at least stoichiometric quantities of a solid, powdered alkali metal hydroxide at temperatures of from 0 to 100.degree. C.

Secondary and tertiary phosphines and processes for their preparation

A process is specified for the preparation of tertiary phosphines of the formula

Process for the preparation of tertiary phosphines

For the preparation of phosphanes, phosphane and alkyl halides are reacted in the presence of alkali metal hydroxide solutions and tetraalkylammonium or tetraalkylphosphonium salts as the catalysts.

Process for the preparation of phosphanes

Growing community of inventors

Wuppertal, Germany

Othmar Stelzer