Firmenich Sa

Koenraad Vanhessche

Peter Fankhauser

Jean-Marc Gaudin

Fredi Bruhlmann

Cyril Mahaim

Jean-Paul Leresche

George Lem

Anatoly Alexander

Gy&ouml;rgyi Sneyers

Ramez Boshra

Jorge M Lem

The present invention concerns a composition of matter comprising i) from 35 to 55% w/w of (R,Z)-3-methyl-cyclopentadec-5-en-1-one, having an ee of at least 80%; ii) from 27 to 40% of (R,E)-3-methyl-cyclopentadec-5-en-1-one, having an ee of at least 80%; iii) from 3 to 20% of (S,E)-3-methyl-cyclopentadec-4-en-1-one, having an ee of at least 80%; and iv) from 0 to 5% of (S,Z)-3-methyl-cyclopentadec-4-en-1-one, having an ee of at least 80%; as well as the use as perfuming ingredient of said composition of matter.

Powdery, musky odorant macrocycles

The present invention concerns a process for the isomerization of an exo double bond toward an endo double bond being performed in the presence of a catalyst system comprising palladium (Pd) or platinum (Pt) and molecular hydrogen or a hydrogen source.

Process for the isomerisation of an exo double bond

The present invention relates to the field of perfumery. More particularly, it concerns a process for the preparation of 2-methyl-4-phenyl-2-butanol, or even 4-cyclohexyl-2-methyl-2-butanol from 4,4-dimethyl-2,6-diphenyl-1,3-dioxane.

Process for producing 4-cyclohexyl-2-methyl-2-butanol

The present invention relates to the field of organic synthesis and more particularly to a new process for the preparation of an acetal derivative of an alkyl 3-oxo-2-(2-oxoethyl)-1-cyclopentaneacetate. The invention also relates to a method to use said acetal derivative to prepare intermediates useful for the preparation of perfuming ingredients.

Process for the preparation of cyclopentanone derivatives

Use of tertiary alcohols or esters as perfuming ingredients

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Feigères, France

Koenraad Vanhessche