Abstract: 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.

Abstract: 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 ?-hydroxy ketone.

Abstract: 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.

Abstract: 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 ?-hydroxy ketone.

Abstract: The present invention relates to an acetal of formula in which the symbols R1 represent, independently or simultaneously, a linear or branched saturated or unsaturated C1 to C4 hydrocarbon group; or the two R1 are bonded together to form a saturated ring having 5 to 7 atoms and including the oxygen atoms to which the R1 groups 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.

Abstract: The present invention relates to an acetal of formula 1

Abstract: The cycloaliphatic ketones of formula ##STR1## having two conjugated double bonds in positions 1 and 3, or 2 and 4, such as indicated by the dotted lines, and wherein R defines a C.sub.1 to C.sub.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Kentones of the formula ##STR1## wherein each of the symbols R.sup.1, R.sup.2, and R.sup.3 identical or different, represent a hydrogen atom or a lower alkyl radical containing 1 to 3 carbon atoms are disclosed useful as perfuming agents and in the preparation of perfume products.

Abstract: Bicyclic aldehyde derivatives of formula ##STR1## containing a single or a double bond in the position indicated by the dotted lines and wherein symbol R.sup.1 represents a hydrogen atom or a methyl radical and R.sup.2 defines a linear or branched alkyl radical containing 1 to 6 carbon atoms.Compounds (I) find specific utility as perfuming and flavoring agents.Process for the preparation of said compounds (I) starting from cyclopentadiene or a methyl substituted cyclopentadiene and an alkyl 4-oxo-butenoate.

Abstract: Bicyclic aldehyde derivatives of formula ##STR1## containing a single or a double bond in the position indicated by the dotted lines and wherein symbol R.sup.1 represents a hydrogen atom or a methyl radical and R.sup.2 defines a linear or branched alkyl radical containing 1 to 6 carbon atoms.Compounds (I) find specific utility as perfuming and flavoring agents.Process for the preparation of said compounds (I) starting from cyclopentadiene or a methyl substituted cyclopentadiene and an alkyl 4-oxo-butenoate.

Abstract: Process for preparing unsaturated spiranic derivatives of formula ##STR1## wherein index n represents integer 1 or 2 and wherein symbol R defines a lower alkyl radical, starting from the corresponding cycloalkanone via an addition thereto of a dihalo-alkene of formula ##STR2## wherein symbol R possesses the above-indicated meaning and X represents a halogen atom.