Basf Se Corporation

Gabriele Gralla

Klaus Ebel

Gunnar Heydrich

Wolfgang Krause

Ralf Pelzer

Andreas Keller

Nawid Kashani-Shirazi

Karl Beck

Marko Friedrich

Eike Johannes Bergner

Rocco Paciello

Oliver Bey

Matthias Rauls

Ulrich Griesbach

Timon Stork

Bernhard Brunner

Steffen Oehlenschläger

Joachim Schmidt-Leithoff

Martin Kamasz

Roland Minges

Christoph Jäkel

Jörg Botzem

Stephan Zuend

Margarethe Klos

Christoph Jäkal

The presently claimed invention relates to a process for the recovery of 3-methyl-3-buten-1-ol from a stream obtained in the production of 3-methyl-3-buten-1-ol from 2-methylprop-1-ene and formaldehyde, by treating the stream with an amine catalyst.

Process to recover high quality 3-methyl-but-3-en-1-ol

The presently claimed invention relates to a process for the recovery of 3-methyl-3-buten- -ol from a stream comprising (Z)-3-methylpent-2-ene-1,5-diol, (E)-3-methylpent-2-ene-,5-diol and 3-methylenepentane-1,5-diol by treating the stream with isobutene and water.

Process to recover 3-methyl-but-3-en-1-ol

The present invention provides a process for preparing an unsaturated alcohol of the formula (I), wherein one of Rand Ris preferably C-C-alkyl or C-C-alkenyl containing one double bond and the other one is preferably hydrogen or methyl; Ris preferably hydrogen; which comprises subjecting an educt composition including at least 75% by weight of an unsaturated aldehyde of the formula (II) wherein R, Rand Rpreferably have the above defined meanings, to a hydrogenation in the presence of a catalyst and a tertiary amine; wherein the tertiary amine is used in an amount ranging from 0.001 to 0.7% by weight, based on the total amount of the liquid reaction mixture. The invention further relates to the nerol compound obtainable by the inventive process, to a fragrance or aroma substance composition comprising the nerol compound obtainable by the inventive process, to a method for imparting and/or intensifying an odor or flavor of a product, and also to perfumed or aromatized products comprising a nerol compound obtainable by the inventive process. 

Process for preparing 2,3-unsaturated alcohols

The present invention relates to a particularly economic overall method for producing menthol, specifically for producing optically active, essentially enantiomerically and diastereomerically pure L-menthol and racemic menthol, starting from the starting material citral which is available inexpensively on an industrial scale. The method has the following steps

Method for producing optically active, racemic menthol

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 preparing 4,4'-[1-(trifluoromethyl)alkylidene]bis(2,6-diphenylphenols), in particular for preparing 4,4&#x2032;-[1-(trifluoromethyl)ethylidene]bis(2,6-diphenylphenol), which comprises the self-condensation of cyclohexanone in the presence of a basic catalyst to form tricyclic condensation products, dehydrogenation of the resulting tricyclic condensation products in the presence of a supported transition metal catalyst in the condensed phase to form 2,6-diphenylphenol and reaction of the 2,6-diphenylphenol with a trifluoromethyl ketone. The invention further provides an improved process for preparing 2,6-diphenylphenol by aldol self-condensation of cyclohexanone.

Method for the production of 4,4'-[1-(trifluoromethyl)alkylidene]-bis-(2,6-diphenylphenols)

The present invention relates to a process for the preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans by reacting 3-methylbut-3-en-1-ol (isoprenol) with the corresponding alkenealdehydes in the presence of a strongly acidic ion exchanger with subsequent hydrogenation. Specifically, the present invention relates to a corresponding process for the preparation of 2-isobutyl-4-hydroxy-4-methyltetrahydropyran by reacting isoprenol with prenal, with subsequent hydrogenation.

Process for the preparation of 2 substituted tetrahydropyranols

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 present invention relates to a process for the preparation of 2-substituted 4-hydroxy-4-methyltetrahydropyrans by reacting 3-methylbut-3-en-1-ol(isoprenol) with the corresponding alkenealdehydes in the presence of a strongly acidic ion exchanger with subsequent hydrogenation. Specifically, the present invention relates to a corresponding process for the preparation of 2-isobutyl-4-hydroxy-4-methyltetrahydropyran by reacting isoprenol with prenal, with subsequent hydrogenation.

The present invention relates to an improved process for preparing a substituted or unsubstituted phenylcyclohexane by catalytic hydrogenation of a substituted or unsubstituted biphenyl.

Process for preparing a phenylcyclohexane

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 continuous process for preparing racemic or optically active menthol in pure or enriched form by distillatively separating menthol from substance mixtures which comprise essentially menthol and diastereomers thereof. This distillatiive separation is performed in a dividing wall column with 50 to 300 theoretical plates and one or more side draw points at an absolute operating pressure of 5 to 500 mbar.

Continuous process for preparing menthol in pure or enriched form

The present invention relates to a particularly economic overall method for producing menthol, specifically for producing optically active, essentially enantiomerically and diastereomerically pure L-menthol and racemic menthol, starting from the starting material citral which is available inexpensively on an industrial scale. The method comprises the following steps a) catalytic hydrogenation of neral and/or geranial to give citronellal, b) cyclization of citronellal to isopulegol in the presence of an acidic catalyst, c) purification of isopulegol by crystallization and d) catalytic hydrogenation of isopulegol to give menthol.

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Mannheim, Germany

Gabriele Gralla