Basf Se Corporation

Helmut Kronemayer

Andreas Lanver

Ellen Dahlhoff

Rolf Pinkos

Ralf Pelzer

Georg Heinrich Grosch

Miriam Bru Roig

Florian Garlichs

Manuel Danz

Regina Vogelsang

Melanie Weingarten

Volker Hickmann

Mathieu Blanchot

Nicolas Marion

Sebastian Wloch

Klaus Peter Gumbel

Alexey Shilkin

Tim Balensiefer

Thomas Maidhof

Axel Binder

Karin Schein-Albrecht

Thomas Ehlis

Rieke Lang

Andreas Melzer

Dennis Kaufhold

The present invention relates to substituted 4-methylene-tetrahydropyrans, 4-methyl-dihydropyrans and 4-methyl-tetrahydropyrans of formula (I), where the variables are as defined in the claims and description, to a stereoisomer thereof, to a mixture of stereoisomers thereof, to a mixture of different di- and tetrahydropyrans (I) and to a mixture containing at least one di- or tetrahydropyran (I) and at least one cyclic acetal which is a 1,3-dioxan carrying in 2-position an isobutanol-2-yl-(derived) substituent and in 4,4- or 5,5-position two methyl substituents. The invention also relates to the use of such compounds as an aroma chemical and/or for modifying and/or enhancing the aroma of a composition, to compositions comprising such compounds, to methods for preparing such compounds and to a product obtainable by these methods.

Substituted 4-methylene-tetrahydropyrans, 4-methyl-dihydropyrans and 4-methyl-tetrahydropyrans and use thereof as aroma chemicals

A process for decomposing formates in formate-containing compositions of matter comprises reacting formate-containing compositions of matter in the presence of at least one heterogeneous catalyst comprising lanthanum and at a temperature of from 80 to 180&#xb0; C. and a pressure of from 0.1 to 60 bar, the formate-containing compositions of matter having a pH of from 6.5 to 10.

Method for breakdown of formates

Process for preparing divinyl ethers by reacting compounds having two hydroxyl groups (hereinafter referred to as diols) with acetylene, wherein

Process for preparing divinyl ethers

In a process for preparing carboxylic esters by transesterification, a first feed stream comprising a first carboxylic ester, e.g. methyl formate, is introduced laterally into a reaction column at least one first feed point located between top and bottom of the reaction column and a second feed stream comprising a first alcohol, e.g. ethanol, is introduced laterally into the reaction column at a second feed point located above the first feed point and are reacted in a reaction zone of the reaction column to form a second carboxylic ester and a second alcohol. The first alcohol has a higher molecular weight than the second alcohol. A product fraction comprising the second carboxylic ester and unreacted first carboxylic ester is taken off at an offtake point located above the second feed point. At the bottom of the reaction column, a bottom fraction comprising the second alcohol and unreacted first alcohol is taken off. The product fraction is separated by distillation at a pressure which is different from the pressure in the reaction column into second carboxylic ester and a fraction comprising unreacted first carboxylic ester and the fraction comprising unreacted first carboxylic ester is at least partly recirculated to the reaction zone.

Process for preparing carboxylic esters by reactive distillation

In a process for purifying carboxylic esters such as ethyl formate, a carboxylic ester to be purified is distilled in the presence of an extractant, preferably by (a) allowing vapor of the carboxylic ester to be purified to ascend in a distillation column; (b) conveying the extractant in countercurrent to the vapor in an extractive distillation column; (c) taking off pure carboxylic ester above the extractive distillation zone. The extractant is, for example, selected from among diols, polyols, open-chain or cyclic amides.

Purification of carboxylic esters by extractive distillation

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Heidelberg, Germany

Helmut Kronemayer