Firmenich Sa

Ferdinand Naef

Rene Decorzant

René Decorzant

George M Whitesides

Pierre-Alain Blanc

Francois Delay

Arnoldus Uijttewaal

Wolfgang K Giersch

Christian Vial

Jean-Marc Gaudin

Sina Dorothea Escher

Regula Naef

Nicole Van Beem

Rene Decorzani

The present invention relates to the field of organic synthesis and more particularly to a new process for the dimerisation of alkyl glyoxals, said process being promoted by an alkaline salt of the hydroxymethanesulfinic acid and is performed at a pH comprised between 3.5 and 9.5.

Process for the dimerisation of alkyl glyoxals

The present invention relates to a process for the preparation of compounds of a 1,4-dialkyl-2,3-diol-1,4-butanedione by a catalytic aldol condensation between an alkyl glyoxal and an &#x3b1;-hydroxy ketone.

Process for the preparation of 1,4-dialkyl-2,3-diol-1,4-butanedione

The present invention refers to a process for the preparation of unsaturated ketones or aldehydes by pyrolysis of a lactone, in the presence of a reducing agent such as molecular hydrogen or a carboxylic acid, and in the presence of a catalyst, optionally supported, comprising at least one metal selected from the group consisting of Y, Ti, Cd, Mn, Zn, Sc and Zr.

Process for the direct conversion of lactones into unsaturated ketones or aldehydes

The present invention relates to an acetal of formulain which the symbols Rrepresent, independently or simultaneously, a linear or branched saturated or unsaturated Cto Chydrocarbon group; or the two Rare bonded together to form a saturated ring having 5 to 7 atoms and including the oxygen atoms to which the Rgroups are bonded, this ring being possibly substituted by methyl or ethyl groups; and the wavy line indicates that the double bond in position 4 has a configuration of the type (Z) or (E) or a mixture of the two configurations. The invention relates also to the use of such compounds as perfuming or flavoring ingredients, as well as the perfumed or flavored articles or perfuming or flavoring compositions containing such compounds.

Acetals of 2,4,7-decatrienal as perfuming or flavoring ingredients

Process for the manufacture of unsaturated cycloaliphatic ketones

1,3-Undecadien-5-yne and its (E) and (Z) configuration isomers are useful perfuming ingredients for the preparation of perfuming bases and a variety of perfumed consumer products, to which they impart odor characters of the galbanum, floral, fruity-citrus type.

Use of 1,3-undecadien-5-yne as a perfuming ingredient

The cyclic tertiary alcohols of formula ##STR1## wherein the dotted line indicates the location of a single or double bond, symbols R.sup.1 and R.sup.3 represent each a hydrogen atom or a methyl radical and symbol R.sup.2 stands for a lower alkyl radical, are useful perfuming ingredients for the preparation of perfuming compositions and perfumed articles, to which they impart odor notes of the patchouli type.

Cyclic tertiary alcohols and their use as perfuming ingredients

Ethyl (2E,4Z,7Z)-2,4,7-decatrienoate, a novel compound, is a useful perfuming ingredient capable of imparting odor notes of the pear, green, violet leaf type to the compositions and articles into which it is incorporated. It can also be advantageously used in a variety of flavoring compositions.

Ethyl (2E,4Z,7Z)-2,4,7-decatrienoate and its use as a perfuming or

Aromatic aldehydes of formula ##STR1## possessing a single or a double bond in the position indicated by the dotted line and wherein symbol X represents a monovalent radical or formula ##STR2## or, when the dotted line represents a single bond, of formula ##STR3## and wherein symbol Z stands for an oxygen atom or for two R.sup.2 O radicals, each of R.sup.1 and R.sup.2 representing an alkyl radical having from 1 to 3 carbon atoms. Aromatic aldehydes (I) possess useful odorous properties and can be used as perfuming ingredients for the preparation of perfume bases and perfumed articles. They can also be used as starting materials for the preparation of useful end-products having herbicide and fungicide properties. Process for the preparation of aromatic aldehydes (I) starting from 8-methoxycuminic aldehyde.

Aromatic aldehydes, their derivatives and their utilization as perfuming

Aromatic aldehydes of formula ##STR1## possessing a single or a double bond in the position indicated by the dotted line and wherein symbol X represents a monovalent radical or formula ##STR2## or, when the dotted line represents a single bond, of formula ##STR3## and wherein symbol Z stands for an oxygen atom or for two R.sup.2 O radicals, each of R.sup.1 and R.sup.2 representing an alkyl radical having from 1 to 3 carbon atoms. Aromatic aldehydes (I) posses useful odorous properties and can be used as perfuming ingredients for the preparation of perfume bases and perfumed articles. They can also be used as starting materials for the preparation of useful end-products having herbicide and fungicide properties. Process for the preparation of aromatic aldehydes (I) starting from 8-methoxycuminic aldehyde.

Aromatic aldehydes and their derivatives

Novel hydroperoxide of formula ##STR1## and use of same as intermediate for the preparation of 3a,6,6,9a-tetramethylperhydronaphtho[2,1-b]furan, also known as AMBROX (registered tradename of FIRMENICH SA, Geneva/Switzerland). Process for its preparation via an oxidation of sclareol by means of hydrogen peroxide in the presence of an acidic agent.

Novel hydroperoxide and use of same as intermediate for the preparation

Oxygenated decaline derivatives of formula ##STR1## wherein X represents a COOH or a CHO group are obtained according to a process which consists in the oxidation of a ketone of formula ##STR2## by means of oxygen in a basic medium constituted by potassium tert-butoxide in 1,2-dimethoxyethane. Compounds (I) are useful starting materials for the preparation of AMBROX.RTM. (registered tradename of Firmenich SA, Geneva, Switzerland) which is an ingredient in perfumes.

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Carouge, Switzerland

Ferdinand Naef