74285-68-0

Upstream product

• 942420-03-3 C₂₂H₂₅ClO₄ 
• 83020-62-6 6-Hydroxy-3-(3'-hydroxy-3'-methyl-4'-penten-1'-inyl)-2,4,4-trimethyl-2-cyclohexen-1-on 

Downstream Products

• 80736-89-6 (2E,4E)-1-bromo-3-methyl-5-(4-hydroxy-2,6,6-trimethyl-3-oxo-1-cyclohexen-1-yl)-2,4-pentadiene 
• 138893-58-0 5-(2,6,6-trimethyl-3-oxo-4-hydroxy-1-cyclohexen-1-yl)-3-methyl-2,4-pentadiene-1-ol trifluoroacetate 

Relevant academic research and scientific papers

6-HYDROXY-3-[3-HYDROXY-3-METHYL-PENTA-1,4-DIENYL]-2,4,4-TRIMETHYL-CYCLOHEXA-2,5-DIEN-1-ONE

The present invention relates to a process for preparing 6-hydroxy-3-[3-hydroxy-3- methyl-penta-1,4-dienyl]-2,4,4-trimethyl-cyclohexa-2,5-dien-1 -one of the formula (I). The invention also relates to 6-hydroxy-3-[3-hydroxy-3-methyl-penta-1,4-dienyl]-2,4,4

PROCESS FOR THE SYNTHESIS OF INTERMEDIATES FOR THE PREPARATION OF ASTAXANTHIN

The present invention relates to a process for the preparation of intermediates useful in the synthesis of Astaxanthin, in particular C15-Wittig salts, but also 4-oxo-β-ionones, 3-hydroxy-4-oxo-β-ionones and the aryl esters thereof. 4-oxo-β-ionone is prepared by starting from a β-ionone by oxidation with bromates in the presence of iodine or iodide. 3-hydroxy-4-oxo-β-ionone is prepared in 4 steps, starting from 4 -oxo- β-ionone by oxidation with peracids; the aryl esters thereof are solids that are easily isolated and purified by crystallisation, and may be converted in 5 steps to C15-Wittig salts and finally, by the Wittig reaction, to Astaxanthin.

METHOD FOR REDUCING ALKINE COMPOUNDS

The invention relates to a method for producing cyclohexene derivatives of general formulae (I) or (II), by reducing alkine compounds of general formulae (III) or (IV), with a mixture of zinc and at least one ammonium salt of formula (V) as a reducing age

METHOD FOR THE CATALYTIC HYDROGENATION OF ALKYNE COMPOUNDS

The invention relates to a method for producing cyclohexene derivatives of the general formulae (I) or (II), in which the substituents R1 and R2 independently of one another are defined as follows: R1 = (formula A, B, C,

Cyclohexenone derivatives and process for making same

A silyl-enol ether of the formula STR1 wherein n stands for the number and X stands for a group STR2 or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R1 have the same

Process for producing astaxanthin

The compound 5[4(acyloxy or protected hydroxy-3-oxo-2,6,6-trimethyl-cyclohex-1-en-1-yl)-3-methyl-penta-1,4-dien-3-ol], an intermediate for the coloring agent astaxanthin, its conversion to astaxanthin and its preparation from 4-oxo-β-ionone including inte