Firmenich Sa

Firmenish Sa

Valentin Rautenstrauch

Kamaluddin Abdur-Rashid

Robert Harold Morris

Raphaël Churlaud

Hubert Mimoun

René Challand

Eric Brazi

Piero Fantini

Arnoldus Uijttewaal

Koenraad P M Vanhessche

Daniel A Dobbs

Khushrav Crawford

The invention relates to a method of use of certain derivatives of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein Rrepresents a hydrogen atom, a Calkyl or alkenyl group, or a (CHR)OH group, each R being a hydrogen atom or a methyl group; Rrepresents a hydrogen atom or a methyl, ethyl or n-propyl group; and Rrepresents a hydrogen atom or a methyl group, as perfuming ingredients. The present invention concerns also certain compounds and compositions or articles containing such compounds.

2-hydroxy-6-methyl-heptane derivatives as perfuming ingredients

Catalysts of formula[Ru(L)(L')XY]&#x2003;&#x2003;(II)wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L&#x2032; a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.

Catalytic hydrogenation processes

The catalysts of formula (II): [Ru(L)(L')XY], wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L&#x2032; a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.

A process for the hydrogenation, using molecular hydrogen (H) of a catalytic system, wherein the catalytic system includes a base and a complex of formula (II):Ru(PN)Y&#x2003;&#x2003;(II)wherein Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, and PNis a tetradentate diimino-diphosphine ligand.

Process for hydrogenation of carbonyl and iminocarbonyl compounds using ruthenium catalysts comprising tetradentate diimino-diphosphine ligands

Process for the preparation of alkyl 3-oxo-2-pentyl-1-cyclopenteneacetates

A catalyst of ruthenium (II) comprising bidentate phosphine ligands is described which is obtained by a process that comprises treating equimolar amounts of an appropriate Ru complex and a bidentate diphosphine ligand with an acid of the formula H-Anion, wherein the anion is a non-coordinating anion, said acid being used in a ratio of 1 molar equivalent per mole of Ru complex and the treatment being carried out in a non-coordinating or weakly coordinating medium, under an oxygen-free atmosphere. Said catalyst is useful for the preparation of the preferred isomer of the Hedione&reg;, having the configuration (&plus;)-(1R)-cis, and of many other substrates comprising highly hindered carbon-carbon double bonds.

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Collonges-sous-Saleve, France

Valentin Rautenstrauch