Th. Goldschmidt Ag

Goetz Koerner

Wilfried Knott

Christian Weitemeyer

Burghard Gruning

Klaus-Dieter Klein

Gerd Rossmy

Ulrich Holtschmidt

A method for the preparation of dialkylmagnesium compounds is disclosed, wherein magnesium hydride is reacted with an olefin in the presence of a halide of sub-groups IV to VIII of the Periodic Table and in the presence of an ether as reaction medium at a temperature of about between 1 to 300 bar and in a temperature range of about 0.degree. to 200.degree. C. According to the disclosed invention, the magnesium hydride is activated by grinding to a particle size of .ltoreq.10 .mu.m and the method is carried out in the absence of complex catalysts. The grinding of the magnesium hydride takes place prior to the reaction with the olefin, but may also be conducted during the reaction.

Method for the preparation of dialkylmagnesium compounds by the reaction

Novel organopolysiloxanes are disclosed which comprise ##STR1## wherein R.sup.1 is methyl or phenyl, with the proviso that at least 90% of R.sup.1 is methyl; and

Organopolysiloxanes and curable organopolysiloxane preparation

Particles less than 100 .mu.m in size and modified by hydrophilic and hydrophobic groups wherein the hydrophilic and hydrophobic groups are distributed anisotropically on the surface of the modified particles. Processes for the preparation of such particles and the use of such particles as surface active products, especially for stabilizing or destablizing emulsions and foams as well as for tertiary oil recovery.

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Essen, Germany

Goetz Koerner