公开(公告)号：US10017465B2

公开(公告)日：2018-07-10

申请号：US15502827

申请日：2015-07-23

Applicant: BASF SE

Inventor： Bernd Schäfer ,  Wolfgang Siegel

IPC: C07C403/24 ,  B01J31/02 ,  B01J31/22

CPC classification number: C07C403/24 ,  B01J31/0222 ,  B01J31/2291 ,  B01J31/2295 ,  B01J2231/645 ,  B01J2531/821 ,  C07B2200/07 ,  C07C2601/16

Abstract: The invention relates to a method for the non-stereoselective and also for the stereoselective synthesis of astaxanthin from astacin. For this purpose, a reducing agent is used selected from the group of hydrogen, a secondary alcohol, formic acid and also the salts of formic acid or from a mixture of at least two representatives of the compound classes stated above. The invention further relates to the use of astacin as starting compound for the synthesis of astaxanthin.

公开(公告)号：US10017466B2

公开(公告)日：2018-07-10

申请号：US15516216

申请日：2015-10-01

Applicant: BASF SE

Inventor： Bernd Schäfer ,  Wolfgang Siegel

IPC: C07C403/24

CPC classification number: C07C403/24 ,  C07C2601/16 ,  C09B61/00 ,  C09B67/0096

Abstract: The present invention relates to a process for purifying the xanthophylls astaxanthin and canthaxanthin.The process comprises suspending the xanthophyll in an organic solvent or solvent mixture, treating the suspension of the xanthophyll in the organic solvent or solvent mixture at elevated temperature, and subsequent separation off of the xanthophyll from the solvent by a solid-liquid separation, wherein the organic solvent is selected from ketones of the general formula (I) and mixtures of ketones of the general formula (I) where R1 is C1-C4 alkyl and R2 is selected from C1-C6 alkyl, C3-C8 cycloalkyl, phenyl and benzyl, wherein the phenyl rings in the two last-mentioned radicals are unsubstituted or can have 1 or 2 methyl groups, or R1 and R2 together are linear C4-C6 alkylene, which can bear 1, 2 or 3 methyl groups as substituents.

公开(公告)号：US10017464B2

公开(公告)日：2018-07-10

申请号：US15502816

申请日：2015-07-31

Applicant: BASF SE

Inventor： Bernd Schäfer ,  Wolfgang Siegel

IPC: C07C403/24 ,  C07C403/08

CPC classification number: C07C403/24 ,  C07B2200/07 ,  C07C403/08 ,  C07C2601/16

Abstract: The invention relates to a method for preparing a cyclic α-ketoalcohol, particularly a 6-hydroxycyclohexenone from a cyclic α-ketoenol, particularly a 6-hydroxycyclohexadienone, using a reducing agent. This reducing agent is selected from hydrogen gas; a secondary alcohol, formic acid and the salts of formic acid or a mixture of at least two representatives of these compound classes. The invention further comprises the use of an α-ketoenol, in particular a 6-hydroxycyclohexadienone, as intermediate for preparing astaxanthin.