Firmenich Sa

Valentin Rautenstrauch

Ferdinand Naf

Jean-Pierre Genet

Jean-Jacques Riedhauser

Koenraad P Vanhessche

Jean-Yves Lenoir

Ruthenium catalysts and their use in the asymmetric hydrogenation of

Process for the preparation of (+)-(1R)

Cyclopentenones of formula ##STR1## wherein each of symbols R.sup.1 and R.sup.2, when taken separately, represents an alkyl radical of C.sub.1 to C.sub.6, or a hydrogen atom, or, when taken together, they represent a polymethylene, or one of them designates a hydrogen atom and the other an alkyl radical of C.sub.1 to C.sub.6, are prepared starting from compounds having formula ##STR2## wherein R stands for a C.sub.1 to C.sub.6 alkyl radical or a phenyl group, via a catalytic reaction promoted by a metallo-organic compound of formula

Process for the preparation of alkylated cyclopentenones

Process for the preparation of .gamma.,.delta.-unsaturated carboxylate esters which comprises reacting an .alpha.,.beta.-unsaturated alcohol with a trialkyl orthopropionate in the presence of an organic acid having pk.sub.a of about 7 to 9. Among the thus obtained .gamma.,.delta.-unsaturated carboxylate esters, 2,5,9-trimethyl-deca-3,4,8-triene-carboxylates and 2-methyl-3-[2-methyl-5-isopropenyl-cyclopent-1-en-1-yl]-propionates are particularly useful as intermediates for the preparation of perfuming ingredients.

Process for the preparation of alkyl .gamma.,.delta.-unsaturated

Cyclobutane derivatives useful as odor-modifying ingredients for manufacturing perfumes and perfumed products, and as flavor-modifying ingredients for the manufacture of artificial flavors or for flavoring foodstuffs, feedstuffs, beverages, pharmaceutical preparations or tobacco products.

Method of improving, enhancing or modifying perfume using cyclobutane

Process for the preparation of unsaturated cycloaliphatic ketones useful as perfuming and odour-modifying agents in the manufacture of perfumes and perfumed products, and as flavouring and taste-modifying agents in the aromatization of foodstuffs in general and imitation flavours for foodstuffs, beverages, animal feeds, pharmaceutical preparations and tobacco products. Compositions of matter relating to some of said unsaturated cycloaliphatic ketones which are new, and perfume- and flavouring compositions containing same.

Growing community of inventors

Bernex, Switzerland

Valentin Rautenstrauch