Ruhrchemie Aktiengesellschaft

Wolfgang Bernhagen

Helmut Springer

Jurgen Weber

Helmut Bahrmann

Boy Cornils

Ernst Wiebus

Hanswilhelm Bach

Wilhelm Gick

Claus Kniep

Volker Falk

Eike Brundin

Adolf Hack

An improved process for preparing 3-dimethylamino-2,2-dimethylpropanal from isobutyraldehyde, dimethylamine and a source of formaldehyde is disclosed wherein the process is carried out at a pH value of 9 to 11.

Process for preparing 3-dimethylamino-2,2-dimethylpropanal

An improved process for the preparation of 2,3-dimethyl-2,3-butanediol is disclosed wherein hydrogen peroxide and 2,3-dimethylbutene are reacted with formic acid at 50.degree. to 70.degree. C. while stirring, the 2,3-dimethylbutene and hydrogen peroxide being introduced into the formic acid simultaneously but separately. The diol can be obtained by hydrolysis of the pinacol monoformate formed.

Process for preparing 2,3-dimethyl-2,3-butanediol

A process for the preparation of 2-methyl-2-sec.butyl-1,3-propanediol comprising hydroformylating 2-methyl-1-butene with carbon monoxide and hydrogen in the presence of a first catalyst to form the substance 3-methyl-pentanal, condensing said substance with formaldehyde, or a compound which forms formaldehyde under the conditions of condensation in a basic medium to form alpha-sec.butyl-acrolein, partially hydrogenating said acrolein in the presence of a second catalyst to form the material 2,3-dimethyl pentanal, and converting said material into said diol by treatment with formaldehyde, or a compound which forms formaldehyde under the conditions of conversion, in the presence of a strong base as a third catalyst. The compound of the present invention is useful as an intermediate in the production of pharmaceuticals and drugs; in particular, the production of carbamates which are useful as tranquilizers and blood pressure lowering agents.

Process for preparing 2-methyl-2-sec.butyl-1,3-propanediol

A process for the preparation of di-n-propylacetic acid which comprises the steps of

Process for the production of di-n-propylacetic acid

2-Propyl-pent-4-en-1-al of the formula ##STR1## and a process for its preparation.

2-Propyl-pent-4-en-1-al

A process for the preparation of 2,3-dimethylbutene-2 is disclosed, which comprises the steps of converting isovaleraldehyde to isopropylacrolein, hydrogenating .alpha.-isopropylacrolein to form 2,3-dimethylbutanol, dehydrating 2,3-dimethylbutanol to form an olefin mixture comprising 2,3-dimethylbutene-1 and 2,3-dimethylbutene-2, and isomerizing the 2,3-dimethylbutene-1 contained in the mixture into 2,3-dimethylbutene-2. The present process is technically simple and inexpensive to utilize, and results in high yields of the desired product.

Process for preparing 2,3-dimethyl-butene-2

A process for preparing methacrolein by catalytic reaction of propionaldehyde with formaldehyde is disclosed wherein the catalyst comprises a mixture of secondary amine and organic carboxylic acid with up to 8 carbon atoms.

Process for preparing methacrolein

A process for preparing 2-methylenealdehydes by reacting aldehydes with formaldehyde in the presence of enamines is disclosed.

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Mulheim, Germany

Wolfgang Bernhagen