Netscher
Thomas Netscher, Bad Krozingen DE
Patent application number | Description | Published |
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20080275275 | Process for the Preparation of Ubihydroquinones and Ubiquinones - A process for the preparation of ubihydroquinones and ubiquinones by condensation of a prenol or isoprenol with a hydroquinone or derivative thereof in the presence of 0.005-1.0 mol % of a catalyst which is a Broensted-acid, a Lewis-acid from the group consisting of a derivative of Bi or In or an element of group 3 of the periodic table of the elements, a heteropolyacid, an NH- or a CH-acidic compound, and optionally oxidizing the ubihydroquinone obtained. | 11-06-2008 |
20090176998 | Process for the manufacture of chroman derivatives, especially alpha-tocopherol and alka-noates thereof - The present invention relates to novel processes for the manufacture of chroman derivatives such as α-tocopherol (TCP) and alkanoates thereof, especially α-tocopheryl acetate (TCPA), whereby at least one step of the processes is carried out in the presence of a Lewis acid or a mixture of a Lewis acid with a Bronsted acid as the catalyst under pressure, preferably at an absolute pressure of at least 1.1 bar. | 07-09-2009 |
Thomas Netscher, Basel CH
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20130197272 | ISOMERIZATION OF BETA-KETO-ALLENES - Isomerization of β-keto-allenes of the general formula I wherein R | 08-01-2013 |
20140155636 | PROCESS OF SEPARATING CHIRAL ISOMERS OF CHROMAN COMPOUNDS AND THEIR DERIVATIVES AND PRECURSORS - The present invention relates to a process of separating chiral isomers of chroman compounds, particularly tocopherols and tocotrienols as well as the esters and intermediates thereof. It has been found that this process allows a separation of the desired isomer with a higher yield and enables the use of the non-desired isomers in a very efficient way. Said process is particularly useful when implemented in an industrial process. Furthermore, it has been found that this process allows using isomer mixtures as they result from traditional industrial synthesis. | 06-05-2014 |
20140206905 | PROCESS FOR PREPARING CHIRAL QUINONE - The present invention relates to a process of preparing tocotrienol quinones. It has been found that this process allows the formation of the R-isomer in a high yield in a very efficient and economically interesting way. Said process is particularly useful when implemented in an industrial process. Furthermore, it has been found that this process allows using isomer mixtures as they result from traditional industrial synthesis. | 07-24-2014 |
20140323767 | PROCESS FOR THE PRODUCTION OF 1,3,3-TRIMETHYL-2-(3-METHYLPENT-2-EN-4-YNYL)CYCLOHEX-1-ENE - The present invention relates to an improved process for the production of 1,3,3-trimethyl-2-(3-methylpent-2-en-4-ynyl)cyclohex-1-ene, highly enriched in the Z-isomer, and the use of such compounds in organic syntheses, especially in processes forming intermediates (building blocks) the synthesis of vitamin A or β-carotene or other carotenoids, e.g. canthaxanthin, astaxanthin or zeaxanthin. | 10-30-2014 |
20140350289 | NEW ACID CHLORIDE - The present invention relates to new organic compounds, to their synthesis as well as to their use in organic synthesis, especially in processes forming intermediates (building blocks) for the synthesis of vitamin A or β-carotene or other carotenoids. | 11-27-2014 |
Thomas Netscher, Kaiseraugst CH
Patent application number | Description | Published |
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20130211080 | PROCESS FOR THE MANUFACTURE OF TMHQ - The present invention is directed to a process for the manufacture of 2,3,5-trimethyl-hydro-p-benzoquinone comprising the following steps: a) hydrogenating 2,6-dimethyl-p-benzoquinone with hydrogen in the presence of a hydrogenation catalyst in an organic solvent to obtain 2,6-dimethyl-hydro-p-benzoquinone; b) reacting 2,6-dimethyl-hydro-p-benzoquinone with a secondary amine and formal-dehyde in an organic solvent to obtain 2,6-dimethyl-3-(N,N-disubstituted aminomethyl)-hydro-p-benzoquinone; c) reacting 2,6-dimethyl-3-(N,N-disubstituted aminomethyl)-hydro-p-benzoquinone with hydrogen in the presence of a hydrogenolysis catalyst in an organic solvent to obtain 2,3,5-trimethylhydro-p-benzoquinone; wherein the organic solvent in all steps a), b) and c) is independently selected from the group consisting of methyl tert.-butyl ether, ethyl tert.-butyl ether, tert.-amyl ether, methoxycyclopentane and any mixtures thereof. Preferably the organic solvent used in all steps a), b) and c) is the same. | 08-15-2013 |
20150031910 | CATALYTIC SYNTHESIS OF VITAMIN A INTERMEDIATE - The present invention relates to a process of production of a compound, which is useful as an intermediate (building block) in organic synthesis, especially in the synthesis of vitamin A or β-carotene and derivatives thereof, e.g. canthaxanthin, astax-anthin or zeaxanthin. | 01-29-2015 |