C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 317/64 (2006.01) C07C 403/00 (2006.01) C07D 317/46 (2006.01) C07D 407/06 (2006.01) C07F 7/18 (2006.01) C07F 9/54 (2006.01)
Patent
CA 2127047
Compounds of the formula I (see formula I) where R1 is H or C1-C4-alkyl, R2 is C1-C4-alkyl and R3 is an ether, silyl ether or acetal protective group which can be converted into a hydroxyl group by hydrolysis, in particular one of the radicals (see formula IV) or (see formula V) and a process for preparing these compounds by reacting an alkenyne of the formula II (see formula II) in an inert solvent in the presence of lithium amide with a cyclohexenone of the formula III (see formula III) and the use of the compounds of the formula I for preparing astaxanthin, are described.
Dobler Walter
Ernst Hansgeorg
Paust Joachim
Rheude Udo
Basf Aktiengesellschaft
Dobler Walter
Ernst Hansgeorg
Paust Joachim
Rheude Udo
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