Bayer Aktiengesellschaft

Haarmann & Reimer Gmbh

Haarmann & Reimer Gesellschaft MIT Beschrankter Haftung

Kurt Bauer

Reiner Molleken

Helmut Fiege

Karlfried Wedemeyer

Alfred Krempel

Detlef Hagena

Alfred Korber

Horst Geilhausen

Gerd-Karl Lange

Eckart Irion

Manfred Mussgay

Rudolf Hopp

Roland Rupp

Hildegard Schnoring

Hans-Walter Brandt

Erhard Schellmann

Jurgen Schroter

Hans-Otto Muller

Wolfgang Sturm

Ruldolf Hopp

Fritz Exner

Gunther Wittman

Werner Steuer

Ulli Harder

Gunther Wittmann

Karl-Heinz Bork

Jurgen Fleischer

The invention concerns new 3-methyl-aldehydes of the general formula ##STR1## wherein x is 6 or 7, a process for their preparation and their use as odorants.

3-Methyl-aldehydes, processes for their preparation and their use as

The invention concerns new 3-methyl-5-keto-.alpha.,.omega.-alkene-dioic acids of the general formula ##STR1## wherein the double bond is in one of the positions indicated by the broken lines,

3-Methyl-5-keto-.alpha.,.omega.-alkenedioic acids and esters

The invention concerns new macrocyclic diesters of the general formula: ##STR1## wherein x is an integer from 8 to 11, which are valuable odorants and a process for their preparation.

Macrocyclic diesters

The invention concerns to new (isocamph-5-yl)-guaiacyl ethers of the formula ##STR1## wherein R is an isocamph-5-yl radical in the 6- or 4-position relative to the ethoxy group; a process for their preparation and their use for the preparation of 3-(isocamph-5-yl)-cyclohexanol which is an important constituent of sandal compound.

Isocamphyl-guaiacol-ethyl ethers

Mixtures of 2- and 4-hydroxybenzyl alcohol with high contents of 4-hydroxybenzyl alcohol are obtained by a process comprising reacting phenol with paraformaldehyde in the presence of a compound which exhibits two or more tertiary nitrogen atoms per molecule and a pK.sub.a value of .gtoreq.6.5 (measured at 20.degree. C. in water).

Process for the preparation of a mixture of 2- and 4-hydroxybenzyl

Mixtures of 2- and 4-hydroxybenzyl alcohol with high contents of 4-hydroxybenzyl alcohol are obtained by a process comprising reacting phenol and paraformaldehyde in the presence of a strongly basic catalyst and a polyalkylene polyether.

Process for the preparation of a mixture of 2-and 4-hydroxybenzyl alcohol

The invention concerns new [isocamph-5-yl]-guaiacyl esters of the formula ##STR1## in which R represents an isocamph-5-yl radical located in the 2-position or 4-position relative to the OAc group and Ac represents a C.sub.1 -C.sub.4 -alkylsulphonyl or di-(C.sub.1 -C.sub.4 -alkyl)-phosphoryl radical; a process for their preparation and their use for the preparation of 3-[isocamph-5-yl]-cyclo-hexanol which is an important constituent of sandal compound.

Esters of isocamphyl-guaiacol, process for their preparation and their

Novel process for the preparation of an arylglyoxylic acid compound, e.g., phenylglyoxylic acid, which comprises oxidizing an .alpha.-hydroxyarylacetic acid, e.g., mandelic acid, of the formula ##STR1## in which m is 1, 2 or 3,

Process for the preparation of arylglyoxylic acids

Compound of the formula ##STR1## in which n stands for 0 or 1 and, where 'n' stands for 0, a double bond is present as indicated by the chain line, and

Nitriles with odorant properties

A process for the preparation of pure 2-hydroxybenzyl alcohol, pure 4-hydroxybenzyl alcohol or a mixture of both hydroxybenzyl alcohols by reacting phenol and formaldehyde in the presence of a basic catalyst and subjecting the resulting reaction mixture to an at least 2-stage countercurrent extraction in a solvent system of water/organic solvent which is water-immiscible or water-miscible only to a limited extent.

Process for the preparation of pure 2-hydroxybenzyl alcohol, pure

Process for the preparation of 3,4-methylenedioxymandelic acid, wherein glyoxylic acid is reacted with 1,2-methylenedioxybenzene in a strongly acid medium.

Process for the preparation of 3,4-methylenedioxymandelic acid

Process for the preparation of cyclopentadecanolide comprising the steps of converting 13-oxa-bicyclo [10.4.0]-hexadecene-[1(12)] to a lactone of the formula ##STR1## wherein X is an oxygen atom, .dbd.NOH or .dbd.N--NH.sub.2, reducing said lactone to give 15-hydroxy-pentadecanecarboxylic acid and cyclising said acid to give cyclopentadecanolide.

Process for the preparation of cyclopentadecanolide

Aromatic hydroxy aldehydes are prepared by the simultaneous oxidation and decarboxylation of hydroxy aryl glycolic acids by reacting same with oxidizing agents in aqueous-acid medium.

Process for preparing aromatic hydroxyaldehydes

The invention concerns a new process for the production of 2-alkoxy-4-propen-1-yl phenols of the formula ##STR1## in which R represents the methyl or ethyl radical wherein 2-alkoxy phenols of the formula ##STR2## in which R is as defined above, are initially condensed with propionaldehyde in the presence of acid catalysts, and the resulting condensation product is subsequently split by heating in the presence of a basic catalyst to form the phenols of formula I.

Process for the production of 2-alkoxy-4-propen-1-yl-phenols

Salicylaldehyde and other hydroxybenzaldehydes are prepared by oxydation of a hydroxybenzyl alcohol in the presence of a platinum metal catalyst and lead, silver, tellurium or tin or compounds thereof as activator.

Growing community of inventors

Holzminden, Germany

Kurt Bauer