Degussa Aktiengesellschaft

Juan G Andrade

Gunter Prescher

Guenter Prescher

Marc Samson

Klaus Koehler

Klaus Kohler

Dietrich Arntz

Michael Kraft

Ulrich Nagel

G/u/ Nter Prescher

A process for the production of 1,12-dodecanoic diacid by hydroformylating an unsaturated carboxy compound in the presence of a rhodium catalyst and oxidation of the aldehyde with oxygen, wherein undecyl-10-ene-acid is hydroformylated in the presence of hydridotristriphenylphosphine-rhodium-carbonyl combined with triphenylphosphine and/or triphenylphosphite, and the 11-formyl undecanioc acid which is thus formed is oxidized with oxygen in the presence of inorganic and organic Co(II) salts.

Process for the production of 1,12-dodecanoic diacid

A process for the production of 1,12-dodecanoic diacid by hydroformylating an olefin in the presence of a rhodium catalyst and oxidation with oxygen of the aldehyde which is thus formed wherein 1,9-decadiene is hydroformylated in the presence of hydridotris-triphenylphosphine-rhodium-carbonyl combined with triphenylphospine and/or triphenylphosphite, and the 1,12-dodecanedialdehyde which was thus formed is oxidized with oxygen in the presence of inorganic or organic Co(II) salts.

There is disclosed a process for the production of 1-methylcyclopropanecarboxaldehyde of the formula ##STR1## comprising treating 4-chloro-2-methyl-butanal of the formula ##STR2## at a temperature between -40.degree. and +7.degree. C. in an inert solvent with a 1.0 to 10.0 fold molar amount of a strong, non-nucleophilic base.

Process for the production of 1-methylcyclopropanecarboxaldehyde

4-chloro-butanals of the formula ##STR1## where R is hydrogen or a straight or branched chain alkyl group of 1 to 4 carbon atoms are produced by reacting the corresponding 1,1-dimethoxy-4-hydroxybutane at a temperature between -20.degree. and +80.degree. C. in the presence of triphenylphosphine with carbon tetrachloride and hydrolyzing the 1,1-dimethoxy-4-chloro-butane obtained in acid medium.

Process for the production of 4-chloro-butanals

A process is described for producing 2,5-dimethoxytetrahydrofuran and 2,5-diethoxytetrahydrofuran by treating 4,4-dimethoxy-1-butanal and 4,4-diethoxy-1-butanal with a strongly acidic ion exchange resin at a temperature of between 0.degree. and 70.degree. C.

Process for the producing 2,5-dimethoxytetrahydrofuran and

A process is disclosed for the preparation of 2-alkyl-1,4-butanedial by hydroformylation of acetals of a 2-alkyl-substituted-1-propenal in the presence of a complex rhodium catalyst. The 3-alkyl-4,4-dialkoxybutanal obtained in this manner is separated and hydrolyzed to the desired compound.

Process for the preparation of 2-alkyl-1,4-butanedial

Optically active 1-benzyl-3,4-bis-(diphenylphosphino)-pyrrolidine is produced in a three-step process from optically active 1-benzyl-2,5-dioxo-3,4-dihydroxy-pyrrolidine. The product is useful as a chiral ligand in rhodium complexes which serve as catalysts for the homogeneous asymmetric hydrogenation of prochiral substrates.

Process for the production of optically active

The preparation of 1,4-butandial (succindialdehyde) is obtained using acrolein. The acrolein is first converted with an alkanol into 3,3-dialkoxy-1-propene and this is then hydroformylated in the presence of hydridotristriphenylphosphine-rhodiumcarbonyl mixed with triphenylphosphine or triphenylphosphite as the catalyst. The thereby obtained 4,4-dialkoxy-butanal is removed from the hydroformylation product by means of distillation and is then hydrolyzed to 1,4-butandial.

Method for the preparation of 1,4-butandial

A method of preparation for acetals utilizing saturated or unsaturated aldehydes, in particular, the preparation of dimethylacetals of acetaldehyde, acrolein and methacrolein. The production of the acetal takes place in a liquid phase in the presence of a solid acid catalyst, such as a strongly acidic ion exchange resin or zeolite. The conversion mixture is extracted by means of water and by means of water insoluble organic solvents. There is obtained not only the desired acetals, but in addition also the unconverted initial quantities of the starting materials by a simple method and with very good yields.

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Kleinostheim, Germany

Juan G Andrade