Abstract: The present invention relates to a process for preparing terpinene-4-ol from limonene-4-ol via a hydrogenation reaction in the presence of a nickel catalyst.

Abstract: The present invention relates to a process for preparing a mixture of terpene alcohols comprising limonene-4-ol and terpinene-4-ol from terpinolene epoxide via an isomerization and/or hydrogenation reaction in the presence of a copper catalyst.

Abstract: The present invention relates to a process for the preparation of terpinolene epoxide by epoxidation of terpinolene.

Abstract: The present invention relates to a process for the preparation of limonene-4-ol by an epoxide ring opening isomerization of terpinolene epoxide.

Abstract: The invention describes an environmentally friendly, sustainable and cost-effective method for preparing astaxanthin diesters of the formula 1, in which astaxanthin of the formula 2 is doubly esterified with fatty acid chlorides of the general formula 3. For this purpose, compound 2 and 3 are reacted in an organic solvent in the presence of a nitrogen-containing base of the general formula 4. The invention further relates to the non-therapeutic use of the diester 1, in which R is a residue selected from the group consisting of C13-C19-alkyl, C13-C19-alkenyl, C13-C19-alkdienyl and C13-C19-alktrienyl, in human or animal nutrition and also the therapeutic use of the diester 1 prepared according to the method as a medicament and also as an ingredient in a medicinal preparation.

Abstract: The present invention relates to the preparation of oxovinylionol and its O-protected derivatives of the formula I in which R is hydrogen or an OH protecting group, for example a group Si(Ra)3, by reacting a compound of the general formula II in which R has the meanings given above for formula I, i.e. ?-vinyl ionol (formula II, R=hydrogen) or an O-protected derivative thereof (formula II, R?OH protecting group) with an oxidant in the presence of at least one transition metal, where the oxidant comprises at least one oxygen-containing compound which is selected from among hydrogen peroxide and organic hydroperoxides.