Hoechst Aktiengesellschaft

Hoechstaktiengesellschaft

Manfred Bohshar

Hans-Jerg Kleiner

Gerhard Pfahler

Heinz Erpenbach

Dieter Regnat

Erhard Jagers

Karl Waldmann

Hanss-Jerg Kleiner

Hans-Peter Koll

6-aryl-6H-dibenzo[c,e][1,2]oxaphosphorine stabilizers for plastics

Aryl phosphonites, a process for their production and their use for

Aryl esters of phosphonous halides and a process for the preparation

Diarylphosphinous acid aryl esters are made by the disclosed process. These compounds are useful for stabilizing plastics, in particular polymerization plastics, and hence can be incorporated into a plastic molding composition.

Diarylphosphinous acid aryl esters, a process for their preparation and

Process for obtaining bis(2,4-di-tert-butylphenyl) halophosphites

A process for the preparation of organophosphorus derivatives of 2,4-di-tert-butylphenol with a high proportion of organophosphorus derivatives of biphenyl, which comprises reacting, in a first step, a 4,4'-dihalobiphenyl whose halogen has an atomic weight of at least 35, under Grignard conditions with magnesium to form the corresponding Grignard compound and this is further reacted in a second step with bis(2,4-di-tert-butylphenyl) chlorophosphite with the formation of a mixture in which at least 50% by weight of the phosphorus is combined in the form of tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylenediphosphonite. The invention further relates to a polyolefin molding composition containing tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylenediphosphonite which was prepared by reaction of a 4,4'-dihalobiphenyl whose halogen has an atomic weight of at least 35 with magnesium to form the Grignard compound and by subsequent reaction with bis(2,4-di-tert-butylphenyl) chlorophosphite. The invention furthermore relates to a process for the preparation of 4,4'-dihalomagnesium compounds of biphenyl by reacting a 4,4'-dihalobiphenyl whose halogen has an atomic weight of at least 35 in the absence of an entrainer, with fine-particle magnesium which is held in suspension.

Process for the preparation of organophosphorus derivatives of

In order to prepare N-acylphosphinothricin diesters, acetals of methyl-(3-oxopropyl)phosphinic acid esters of the formula ##STR1## are reacted in a dipolar aprotic solvent with a carboxylic acid amide and carbon monoxide in the presence of hydrogen gas using a cobalt compound as a catalyst, where the radical R' is alkyl or aryl or aralkyl.

Process for the preparation of N-acylphosphinothricin diesters

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Kelkheim, Germany

Manfred Bohshar