Prototypes of new families of precatalysts and catalysts, [Ru((−)‐Me‐DuPHOS)(H)(η6‐1,3,5‐cyclooctatriene)](BF4) and the derived “[Ru((−)‐Me‐DuPHOS)(H)(sol)](BF4)”, are presented. They are used in an industrial, catalytic, enantioselective hydrogenation that leads to (+)‐cis‐methyl dihydrojasmonate [Eq. (1)]. This stereoisomer is the odorant component of an important, large volume perfumery chemical. P−P=Diphosphane ligand (for example, Me‐DuPHOS=1,2‐bis((2R,5R)‐2,5‐dimethylphospholanyl)benzene); sol=solvent.

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Die Jasmonoide, ()-cis-Jasmonsäure und ihre Derivate, haben zahlreiche phytobiologische Aktivitäten, [1] und der Methylester ()-cis-Methyljasmonat [2] ()-1 weist unter anderem auch einen Geruch auf, [3] der in der Parfümerie hoch geschätzt wird. [4] Das Studium der Jasmonoide begann 1962, als eine weitgehend äquilibrierte Mischung von (À)-trans-Methyljasmonat (À)-2 (Hauptkomponente, siehe unten) und CO 2 Me O CO 2 Me O CO 2 Me O CO 2 Me O CO 2 Me O (+)-1 (-)-2 (+)-3 (-)-4 5 [*] Dr.

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Regioselective hydroxylation on inactivated C−H bonds is among the dream reactions of organic chemists. Cytochrome P450 enzymes (CYPs) perform this reaction in general with high regio‐ and stereoselectivity (e. g. for steroids as substrates). Furthermore, enzyme engineering may allow to tune the properties of the enzyme. Regioselective hydroxylation of shorter or linear molecules (fatty acids), however, remains challenging even with this enzyme class, due to the high similarity of the substrate's backbone carbons and their conformational flexibility. CYPs hydroxylating fatty acids selectively in the chemically more distinct α‐ or ω‐ position are well described. In contrast, selective in‐chain hydroxylation of fatty acids lacks precedence. The peroxygenase CYP152A1 (P450Bsβ) is a family member that displays fatty acid hydroxylation at both, the α‐ and β‐position, with preference for the α‐position. Herein we report the influence of hydrophobic active site residues on the hydroxylation pattern of this enzyme. By site directed mutagenesis and combination of the libraries, double and triple mutation variants were identified, which hydroxylated decanoic acid (C10) with improved regio‐selectivity in the β‐position. Variants were identified with a 10‐fold increase of the β‐regioselectivity (expressed as α/β‐ratio) compared to the wild type. In total 103 variants of CYP152A1 (P450Bsβ) were investigated.