Firmenich Sa

Bernard L Muller

Karl H Schulte-Elte

Roger L Snowden

Karl-Heinrich Schulte-Elte

Gunther Ohloff

Wolfgang K Giersch

Christopher Dean

Jean-Charles Kuhn

Herve Pamingle

Christian Schmidt

Antoine Gautier

Eric Maillefer

Bernard Egger

Process for the preparation of nootkatone

Process for the enzymatic preparation of aliphatic alcohols and

Composition consisting of from less than 100% to more than about 80% of trans-1-(2,6,6-trimethylcyclohexyl)-hexan-3-ol and a definite amount, but not more than about 20%, of cis-1-(2,6,6-trimethylcyclohexyl)-hexan-3-ol. Process for preparing same from .beta.-cyclocitral via a three-, optionally, four-step pathway. Utilization of the said composition as effective perfume ingredient.

Composition essentially consisting of

Novel compounds of formula ##STR1## wherein: a. R.sup.1 =CH.sub.3 ; n=m=1; R.sup.2 =CH.sub.3 ; R.sup.3 =R.sup.4 =H,

Hydroxylic campholenic aldehyde derivatives, their utilization as

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

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

New oxygenated alicyclic compounds of formula ##STR1## (X=OH, alkyl, O-alkyl) are useful as starting materials for the preparation of cyclohexadienic derivatives of formula ##STR2## (X=OH, alkyl, O-alkyl). They are converted into compounds (III) by treating them with an acidic dehydrating agent in the presence of an inert organic solvent.

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Geneva, Switzerland

Bernard L Muller