Hoechst Aktiengesellschaft

Jurgen Svara

Norbert Weferling

Ursus Thummler

Othmar Stelzer

Klaus-Peter Langhans

The invention relates to cyclic acylphosphinic acid derivatives of the formula ##STR1## in which the substituents independently of each other can have the following meaning:

Cyclic acylphosphinic acid derivatives and process for their preparation

The invention relates to novel cyclic acylphosphinic acid derivatives of the formula ##STR1## in which the substituents independently of each other can have the following meaning:

In a process for the preparation of bis(hydroxymethyl)phosphinates of the formula

Aluminum bis(hydroxymethyl)phosphinate, and a process for the

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

For removing hydrogen phosphide from waste air, the hydrogen phosphide-containing waste air is passed at temperatures from 50.degree. to 350.degree. C. over a catalyst which is composed, at least on its surface, of at least one metal which, in a 1-molar acidic aqueous solution, has a potential which is at least 200 mV more positive than that of the standard hydrogen electrode.

Process for removing hydrogen phosphide from waste air

The invention relates to a process for the preparation of tertiary phosphine oxides by reacting primary or secondary phosphines with dimethyl carbonate under elevated pressure at elevated temperature.

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Cologne, Germany

Jurgen Svara