Patent application number | Description | Published |
20080214877 | Method for the Production of Enriched Isopulegol - The present invention relates to a process for preparing enriched isopulegol by crystallization from a melt comprising isopulegol. The invention relates specifically to a process for preparing enantiomerically enriched n-isopulegol proceeding from optically active isopulegol having a relatively low enantiomeric excess by crystallization from the melt. The invention further relates to a process for preparing menthol proceeding from enantiomerically and/or diastereomerically enriched n-isopulegol prepared by crystallization from the melt. | 09-04-2008 |
20080269528 | Method for the Production of Optically Active Carbonyl - The present invention relates to a process for preparing optically active carbonyl compounds by asymmetrically hydrogenating α,β-unsaturated carbonyl compounds in the presence of optically active transition metal catalysts which are soluble in the reaction mixture and have at least one carbon monoxide ligand. The present invention especially relates to a process for preparing optically active aldehydes or ketones, in particular citronellal, by asymmetrically hydrogenating the corresponding optically active α,β-unsaturated aldehydes or ketones. | 10-30-2008 |
20090030235 | METHOD FOR FRACTIONATING STEREOISOMERIC COMPOUNDS - The present invention relates to a method for fractionating stereoisomeric compounds which have at least one alcohol and/or amino group. | 01-29-2009 |
20090227801 | LIGANDS FOR USE IN ASYMMETRIC HYDROFORMYLATION - The invention relates to chiral phosphorus chelate compounds, to catalysts comprising such a compound such a compound as the ligand, and to asymmetric synthesis methods in the presence of such a catalyst. | 09-10-2009 |
20090326226 | METHOD FOR ASYMMETRIC SYNTHESIS - The present invention relates to a process for asymmetric synthesis in the presence of a chiral catalyst comprising at least one complex of a metal of transition group VIII with ligands capable of dimerization via noncovalent bonds, such catalysts and their use. | 12-31-2009 |
20100152494 | METHOD FOR SYNTHESIZING OPTICALLY ACTIVE CARBONYL COMPOUNDS - The present invention relates to a process for preparing optically active carbonyl compounds by asymmetrically hydrogenating α,β-unsaturated carbonyl compounds in the presence of optically active transition metal catalysts which are soluble in the reaction mixture and have at least one carbon monoxide ligand, the optically active catalyst which has at least one carbon monoxide ligand and is to be used in each case being prepared by pretreating a catalyst precursor with a gas mixture comprising carbon monoxide and hydrogen and the asymmetric hydrogenation being performed in the presence of carbon monoxide supplied additionally to the reaction mixture. | 06-17-2010 |
20100193348 | CONTINUOUS PROCESS FOR PREPARING NERAL IN PURE OR ENRICHED FORM - The present invention relates to a continuous process for preparing neral (cis-citral) in pure or enriched form by distillatively separating neral from substance mixtures comprising essentially neral and geranial (trans-citral). This distillative separation is performed in a dividing wall column or in a connection of two distillation columns in the form of a thermal coupling. | 08-05-2010 |
20100249467 | METHOD FOR PRODUCING OPTICALLY ACTIVE, RACEMIC MENTHOL - 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 | 09-30-2010 |
20110045560 | METHOD FOR PRODUCING OPTICALLY ACTIVE 2-METHYL-ALKANOLS - A process for preparing optically active 2-methylalkan-1-ol of the general formula (III) comprising the following steps:
| 02-24-2011 |
20130046118 | METHOD FOR PRODUCING OPTICALLY ACTIVE, RACEMIC MENTHOL - 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
| 02-21-2013 |