Bayer Aktiengesellschaft

Josef Heinrich

Fritz Doring

Reinhold Gehring

Wulf Schwerdtel

Manfred Beck

Rudolf Casper

Karl-Erwin Schnalke

Hubert Lauer

Michael Arndt

Nuclear-halogenated benzotrichlorides are prepared in a particularly advantageous manner from the corresponding nuclear-halogenated benzotrifluorides by reacting nuclear-halogenated benzotrifluorides with silicon tetrachloride in the presence of catalytic amounts of aluminium trichloride.

Process for the preparation of nuclear-halogenated benzotrichlorides

A novel process for the preparation of benzodioxoles of the formula (I) ##STR1## in which Hal represents a chlorine atom or a fluorine atom, from dichlorobenzodioxole using stoichiometric quantities of anhydrous hydrofluoric acid.

Process for the preparation of difluorobenzodioxole and

A process for the preparation of a 2-alkylsulphonylalkylenepyrimidine optionally substituted in 5- and/or 6-positions of the formula ##STR1## comprising (1) reacting an ammonium halide, alkylmercaptan and chloroalkylenenitrile in the presence of an acid acceptor; (2) mixing an ester with an alkyl acetate in the presence of an alcoholic alcoholate solution and an inert diluent; mixing (1) and (2); after completion of reaction removing the alcohol; adding water and an acid to the residue; optionally concentrating the mixture; and, without further purification and/or isolation, reacting the mixture with hydrogen peroxide at a temperature between approximately -20.degree. C. and +100.degree. C. in the presence of a catalytic amount of a vanadium, tungsten or molybdenum salt, in the presence of water as a diluent.

Preparation of 2-alkylsulphonylalkylenepyrimidines

2,3-Dichlorobutadiene-(1,3) is obtained from 2,3,4-trichlorobutene-1 by dehydrohalogenation in the presence of a phase transfer catalyst, an inhibitor and oxygen according to an improved process in which the aqueous solution of an alkali metal hydroxide is added to the mixture of trichlorobutene, catalyst, inhibitor and optionally water, and the reaction is carried out at a temperature of from -10.degree. to +60.degree. C. under an inert gas which contains from 0.1 to 8% by weight of oxygen.

Process for the production of 2,3-dichlorobutadiene-(1,3)

A new catalyst which can be prepared from certain aluminosilicates and certain clay minerals, a process for its preparation and a process for the skeletal isomerization of n-alkenes to iso-alkenes which is carried out in the presence of this catalyst.

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Solingen-Wald, Germany

Josef Heinrich