Basf Se Corporation

Basf Aktiengesellschaft

Karl Beck

Klaus Ebel

Ralf Pelzer

Christian Bittner

Andreas Lanver

Guido Voit

Tom Witzel

Hansgeorg Ernst

Wolfgang Schrof

Oliver Bey

Frank Dietsche

Andrea Misske

Ulrich Griesbach

Timon Stork

Gabriele Gralla

Jörg Botzem

Martin Holderbaum

Wolfgang Krause

Alexander Aumuller

Matthias Dernbach

Ingo Münster

Martin Scholtissek

Hans-Jurgen Weyer

Martine Dehn

Ludwig Völkel

Margarethe Klos

Axel Salden

Arno Kochner

Karin Schein

Oskar Röder

Francis Bocris

The present invention relates to a method for the production of 2-substituted 4-hydroxy-4-methyltetrahydropyrans from the acid-catalyzed reaction of 3-methylbut-3-ene-1-ol with an aldehyde, a stable odoriferous quality being achieved and avoiding off-odors that interfere with the odor sensation.

Production of 2-substituted 4-hydroxy-4-methyltetrahydropyrans having stable odoriferous quality

The present invention relates to a process for the preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans.

Method for producing 2-substituted 4-hydroxy-4-methyl-tetrahydropyrans, said method using recycling

The invention relates to a method for producing 2-substituted 4-hydroxy-4-methyltetrahydropyrans.

Method for producing 2-substituted 4-hydroxy-4-methyl-tetrahydropyrans in a reactor cascade

The present invention relates to a process for the integrated preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans and of 2-substituted 4-methyltetrahydropyrans.

Process for the integrated preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans and of 2-substituted 4-Methyltetrahydropyrans

Process for the preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans of the formula (I)  

Process for the preparation and isolation of 2-substituted tetrahydropyranols

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 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

Preparation of 2-cyano-3,3-diarylacrylic esters

A process for removing water and ammonia from benzophenone imine reactor effluents resulting from the catalytic reaction of benzophenones of the formula I ##STR1## where R.sup.1 and R.sup.2, have the meaning stated in the specification and wherein ammonia is distilled off from effluents and wherein water is either distilled off from the effluents over removed non-distillatively.

Removal of water and ammonia from benzophenone imine reactor effluents

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Östringen, Germany

Karl Beck