Degussa Aktiengesellschaft

Andreas Grund

Guenter Prescher

Georg Boehme

Heinrich Petsch

Willi Hofen

Ulrich Deschler

Rainer Siegmeier

Udo Brandt

Marion Berg

Aliphatic epoxides of the formula: ##STR1## can be prepared in a technically efficient manner from the corresponding olefins by means of perpropionic acid in a benzene solution. The benzene solution can also be 1.5 weight percent of hydrogen peroxide, 1.5 weight percent of water and about 800 ppm of mineral acid.

Process for the treatment of aliphatic epoxides

Epoxidized polybutadienes with an average molecular weight of 500 to 100,000 and a certain content of epoxide oxygen were prepared from the corresponding polybutadienes with use of perpropionic acid in a benzene solution. The solution can also be employed in unpurified form with maximum contents of 1.5 weight percent hydrogen peroxide 1.5 weight percent of water, and about 800 ppm of mineral acid.

Process for the preparation of epoxidized polybutadienes

The diepoxide of the formula: ##STR1## can be prepared from the corresponding diolefin in a technically simple manner by means of perpropionic acid in a benzene solution. The solution can also be employed in unpurified form with certain maximum contents of 1.5 weight percent of hydrogen peroxide, 1.5 weight percent of water, and of about 800 ppm of mineral acid.

Process for the preparation of a cycloaliphatic diepoxide

The method for the isomerization of oxiranes of the general formula: ##STR1## wherein R.sub.1 and R.sub.3 are hydrogen; R.sub.2 is alkyl or alkylene groups of 3 to 26 carbon atoms or the phenyl group which may also be substituted, and R.sub.4 is hydrogen or alkyl from 1 to 26 carbon atoms and in which the carbon atoms of the epoxy ring can also form components of a cyclic system, wherein as a catalyst there is used alkali iodide and a polyethyleneglycol with an average mol mass of 400 to 10,000 with a boiling point, preferably above the boiling point of the carbonyl compounds that are formed.

Method for the isomerization of oxiranes

The continuous preparation of .DELTA. 3-tetrahydrobenzoic acid- .DELTA. 3-tetrahydrobenzyl ester by reaction of 3-cyclohexene-1-carboxaldehyde is disclosed. The reaction is carried out in the presence of an aluminum mixed alcoholate, in which half of the alcohol components consists of isopropylate groups and the other half of sec-butylate groups.

Process for the preparation of .DELTA. 3-tetrahydrobenzoic acid- .DELTA.

A process for the preparation of expoxidized organosilicon compounds by reacting the corresponding unsaturated organosilicon compounds with perpropionic acid in benzene solution. The said solution can also be employed in purified form with maximum contents of hydrogen peroxide, water, or mineral acid.

Process for the preparation of epoxidized organosilicon compounds

A continuous process for the production of 3-cyclohexene-1-carboxaldehyde by reaction of acrolein with butadiene at an elevated temperature and increased pressure is described in which good yields are obtained by establishing the weight ratio of the starting substances fed per time unit into a circulation reactor in relation to the reaction mixture circulated per time unit in the range of 1:5 to 1:60 and by carrying out a secondary reaction in successive reactors.

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Darmstadt, Germany

Andreas Grund