Basf Se Corporation

Basf Aktiengesellschaft

Jörg Botzem

Ulrich Griesbach

Ralf Pelzer

Klaus Ebel

Siegfried R Waldvogel

Andreas Lanver

Karl Beck

Florian Stecker

Ulrich Berens

Andreas Fischer

Gabriele Gralla

Matthias Eiermann

Nicola Christiane Aust

Mario Emmeluth

Thomas Haag

Alcohols are prepared by electrochemical reductive coupling of an aromatic vinyl compound and a carbonyl compound in a process which comprises electrolyzing an electrolyte solution in an electrochemical cell, the electrolyte solution comprising the aromatic vinyl compound, the carbonyl compound and a non-aqueous protic solvent, such as methanol, wherein the electrolyte solution is in contact with a carbon-based cathode. Styrene is reacted with acetone to prepare 2-methyl-4-phenyl-2-butanol.

Process for preparing alcohols by electrochemical reductive coupling

The invention relates to a process for the preparation of m- or p-substituted phenylalkanols of the formula (I) in which Ris bonded to the phenyl ring in the m- or p-position and is C-C-alkyl, and R, R, Rand R, independently of one another, are hydrogen or methyl, wherein an unsubstituted phenylalkanol of the formula (II) in which R, R, Rand Rhave the meanings given under formula (I) is alkylated together with a C-C-alkyl halide of the formula (III)R-Hal&#x2003;&#x2003;(III),in which Rhas the meaning given under formula (I) and Hal is halogen, in the presence of a Friedel-Crafts catalyst to give an m- or p-alkyl-substituted phenylalkanol of the formula (I), then the reaction mixture is worked-up and the desired m- or p-alkyl-substituted phenylalkanol of the formula (I) is separated off, the other formed by-products are returned to the reaction mixture and these are isomerized in the presence of a Friedel-Crafts catalyst to give the desired m- or p-alkyl-substituted phenylalkanol. From the m- or p-alkyl-substituted phenylalkanols of the formula (I), it is possible to form, by oxidation or dehydrogenation, as products of value, the corresponding aldehydes, which play an interesting role as fragrances and aroma chemicals.

Process for preparing M- or P-substituted phenylalkanols by alkylation

The invention relates to a process for the preparation of m-substituted phenylalkanols of the formula (I) in which Ris C-C-alkyl and R, R, Rand R, independently of one another, are hydrogen or methyl, wherein a p-substituted phenylalkanol of the formula (II) in which R, R, R, Rand Rhaving the meanings given under formula (I), is isomerized in the presence of a Friedel-Crafts catalyst to give an m-substituted phenylalkanol of the formula (I). From the m-substituted phenylalkanols of the formula (I) it is possible to form, by oxidation or dehydrogenation, as products of value, the corresponding aldehydes, which are known as fragrances and aroma chemicals.

Method for producing M-substituted phenylalkanols by means of isomerization

The present invention relates to 3-tert-butylbenzaldehyde dimethyl acetal and to 3-tert-butylbenzyl methyl ether and to an electrochemical method for producing 3-tert-butyl-benzaldehyde dimethyl acetal and intermediates passed through in said method.

Electrochemical method for producing 3-tert-butylbenzaldehyde dimethyl acetal

The present invention relates to a process for the preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyranols by reacting 3-methylbut-3-en-1-ol (isoprenol) with the corresponding aldehydes in the presence of a strongly acidic cation exchanger. Specifically, the present invention relates to a corresponding process for the preparation of 2-isobutyl-4-hydroxy-4-methyltetrahydropyran by reacting isoprenol with isovaleraldehyde.

Method for producing 2-substituted tetrahydropyranols

The present invention relates to a process for preparing 2-methyl-3-(4-tert-butyl-phenyl)propanal with high para-isomer purity, and also to a process for preparing 4-tert-butylbenzaldehyde with high para-isomer purity.

Process for preparing 2-methyl-3-(4-tert-butylphenyl)propanal with high para-isomer purity

The invention relates to a process for the preparation of m-substituted alkyltoluenes of the formula (I) in which Ris C-C-alkyl, wherein a p-substituted alkyltoluene of the formula (II) in which Rhas the meaning given under formula (I), is isomerized in the presence of ionic liquids to give an m-substituted alkyltoluene of the formula (I). The m-substituted alkyltoluenes obtainable according to the invention are starting compounds for the preparation of fragrances and aroma substances.

Process for the preparation of m-substituted alkyltoluenes by isomerization with ionic liquids as catalysts

The present invention relates to a process for preparing 2-cyclo-alkenones of the formula I ##STR1## which comprises subjecting a 2-alkoxycycloalkanone and/or a 2-hydroxyalkanone ketal, in which n is an integer from 0 to 20, m is 0, 1, 2 or 3 and R is alkyl, alkylaryl, aryl, arylalkyl, alkenyl or alkynyl, to an elimination reaction in the gas phase on an acidic heterogeneous catalyst.

Growing community of inventors

Limburgerhof, Germany

Jörg Botzem