Abstract: The present invention relates to a new process of production of menaquinone 4, which is also known as vitamin K2.

Abstract: The present invention is directed to a process for the manufacture of 1,1,4,4-tetramethoxy-2-butene from 2,5-dimethoxy-2,5-dihydrofuran with methanol in the presence of an acidic ion exchanger as catalyst, whereby the molar ratio of 2,5-dimethoxy-2,5-dihydrofuran to methanol is ?1:45. The present invention is further directed to a process of separating 1,1,4,4-tetramethoxy-2-butene, methanol and 2,5-dimethoxy-2,5-dihydrofuran from each other and H2O whereby a basic compound, preferably a basic metal salt or a basic ion exchanger, is present. Both processes can be carried out on an industrial scale, batch-wise or in continuous mode and are sustainable since the selectivity and the space-time-yields are high and less waste compared to known processes is produced.

Abstract: The present invention relates to a new process for the production of new specific intermediates, which are preferably used in the production of vitamin A, vitamin A acetate, or ?-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin.

Abstract: The present invention relates to a new process for the production of vitamin A and/or its derivatives.

Abstract: The present invention relates to the functionalisation of specific 1,3-alpha-dienes. These functionalized 1,3-alpha-dienes are important intermediates in organic synthe-sis (especially in the synthesis of carotenoids, vitamin A and/or vitamin A derivatives).

Abstract: The present invention relates to a new compound and the dehydrogenation of that compound to produce retinal.

Abstract: The present invention relates to the functionalisation of specific 1,3-alpha-dienes (by hydroboration). These functionalized 1,3-alpha-dienes are important intermediates in organic synthesis (especially in the synthesis of carotenoids, vitamin A and/or vitamin A derivatives).

Abstract: The present invention relates to specific transition metal catalysts and their use in chemical reactions.

Abstract: The present invention relates to a metal powder catalyst and its use in the selective catalytic hydrogenation of organic starting materials comprising a carbon-carbon triple bond. The powder catalyst comprises a metal alloy carrier, wherein the metal alloy comprises (i) 55 weight-% (wt-%)-80 wt-%, based on the total weight of the metal alloy, of Co, and (ii) 20 wt-%-40 wt-%, based on the total weight of the metal alloy, of Cr, and (iii) 2 wt-%-10 wt-%, based on the total weight of the metal alloy, of Mo, and wherein the said metal alloy is coated by a metal oxide layer and impregnated with Pd, and is characterized in that the metal oxide layer comprises CeO2.

Abstract: The present invention relates to a process of hydrogenating an alkynol selectively to an alkenol by hydrogen using a hydrogenation catalyst which is palladium supported on a carrier in the presence of an additive which is an organic phosphorus compound bearing either a phosphine or a phosphine oxide group and with the proviso that if the additive bears a phosphino group that the additive bears two or more phosphino groups.

Abstract: The present invention relates to new specific enol esters of formula (I) as well as to a process for their production by acylation of the corresponding dihydroretinal analogue. In formula (I) R is —COR? where R? is a C1-C16 alkyl group.

Abstract: The present invention relates to a new process for the production of retinal or hydrogenated form of retinal.

Abstract: The application relates to a process for the preparation of a compound of formula (II) by cyclisation of a polyene of formula (I), and to an intermediate of formula (III). The obtained compounds are useful intermediates in the preparation of specific isoprenoids, preferably in the production of vitamin A and derivatives of vitamin A.

Abstract: The present invention relates to new specific enol esters of formula (I) as well as to a process for their production. In formula (I) R is COR? where R? is a C1-C16 alkyl group.

Abstract: The present invention relates to a new dehydrogenation process of specific compounds.

Abstract: Processes for synthesizing new compounds that may usefully be employed in organic synthesis, especially in the synthesis of vitamin A or ?-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin are disclosed. The new compounds are especially useful as intermediates (building blocks) in the synthesis of vitamin A or ?-carotene, preferably vitamin A.

Abstract: The present invention relates to an improved process to produce a specific and very efficient epoxidation-catalyst (1,2:4,5-Di-O-isopropylidene-?-D-erythro-2,3-hexodiulo-2,6-pyranose).

Abstract: The present invention is related to a new metal powder catalytic system (catalyst), its production and its use in hydrogenation processes.

Abstract: The present invention relates to a process for the production of ?-springene of formula (I) wherein a compound of formula (II) is heated in the presence of a catalyst.

Abstract: The present invention relates to a catalytic process for the ethynylation of specific polyunsaturated aldehydes and ketones.