Firmenich Sa

Karl H Schulte-Elte

Bernard L Muller

Roger L Snowden

Joseph J Becker

Walter Schenk

Gunther Ohloff

Wolfgang K Giersch

Ferdinand Naf

Rene Decorzant

Dietrich Kastner

Eric Maillefer

Oxygenated alicyclic compounds

Polyunsaturated ketones of formula ##STR1## having a double bond in position 2' or 3' of the side chain and possessing either an isolated double bond in position 1 or 2, or two conjugated double bonds in positions 1 and 3 of the ring, as indicated by the dotted lines, and wherein

Process for the preparation of polyunsaturated cycloaliphatic ketones

There are disclosed compounds of formula ##STR1## having a single or a double bond in the position indicated by the dotted line and wherein:

Aliphatic alcohols and esters and their use as perfuming ingredients

Process for the preparation of muscone starting from pyranic derivatives by treatments thereof with hydrogen in an inert organic solvent and in the presence of a noble metal catalyst. Compounds of formula ##STR1## and process for its preparation via dehydrogenation and dehydration of corresponding diol. Process for the preparation of unsaturated macrocyclic ketones of formula ##STR2## wherein the dotted lines stand for a single or a double bond

Pyranic derivatives useful as intermediates in making muscone

Useful perfumery ingredients delta- and epsilon-damascone are prepared by a process which consists in an anionic cleavage, in the presence of a strong base of a diallyl alcohol of formula ##STR1## wherein the dashed lines in position 3 or 4 of the ring designate a double bond, followed by an isomerization of the terminal double bond of the thus obtained product by means of an acidic isomerizing agent.

Process for the preparation of delta- and epsilon-damascones

.alpha.,.beta.-and .beta.,.gamma.-unsaturated ketones of formula ##STR1## possessing a double bond in one of the positions indicated by the dashed lines and wherein R and R.sup.1 have the meaning given above and index n stands for integer 1 or 2, are obtained by a process which consists in treating with a strong base in an inert organic solvent a diallyl carbinol of formula ##STR2## wherein symbol R represents a primary, secondary or tertiary alkyl radical, or a substituted or unsubstituted phenyl radical, and symbol R.sup.1 represents a hydrogen atom or an alkyl radical.

Process for the preparation of .alpha.,.beta.-and

Compounds of formula ##STR1## having a double bond in one of the positions indicated by the dotted lines and wherein R represents a hydrogen atom or a methyl radical are utilized as starting materials for the preparation of bicyclic unsaturated hydrocarbons of formula ##STR2## (R=H, CH.sub.3). Conversion of (II) to (I) occurs via thermal treatment in the presence of a metal catalyst. Disclosed is also a process for the preparation of (II).

Macrocyclic carbonyl compounds, process for their preparation and their

Hydroxy-ketones having formula ##STR1## possessing a double bond in one of the positions indicated by the dotted lines, are prepared starting from a diallyl carbinol of formula ##STR2## Hydroxy-ketones (Ia, b) are useful as intermediates for the preparation of rose oxide.

Process for the preparation of hydroxy-ketones

Methyl 2,6,6-trimethyl-cyclohex-2-en-1-yl carboxylate is a useful perfuming ingredient, especially for the reproduction of fruity, floral and fresh odor notes.

Perfuming ingredient

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.

Bicyclic compounds and utilization thereof as perfuming agents

Process for the preparation of muscone starting from pyranic derivatives by treatments thereof with hydrogen in an inert organic solvent and in the presence of a noble metal catalyst. Compound of formula ##STR1## and process for its preparation via dehydrogenation and dehydration of corresponding diol. Process for the preparation of unsaturated macrocyclic ketones of formula ##STR2## wherein the dotted lines stand for a single or a double bond wherein x=1 and y=2, or

Growing community of inventors

Onex, Switzerland

Karl H Schulte-Elte