Firmenich Sa

Joseph J Becker

Gunther Ohloff

Hugo Strickler

Karl-Heinrich Schulte-Elte

Karl H Schulte-Elte

Walter Schenk

Werner Skorianetz

Khurshid P Dastur

Ulrich P Hochstrasser

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

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

Process for the preparation of muscone

Novel tricyclic lactones, viz. 10,10-dimethyl-4-oxa-tricyclo[7.1.1.0.sup.3,8 ]undec-3(8)-en-5-one and 10,10-dimethyl-4-oxa-tricyclo[7.1.1.0.sup.3,8 ]undecan-5-one, and use thereof as perfuming or flavor-modifying ingredients.

Tricyclic lactones

New tricyclic lactones, viz. 10,10-dimethyl-3-oxa[7.1.1.0.sup.2,7 ]undec-2(7)-en-4-one and 10,10-dimethyl-3-oxa-tricyclo[7.1.1.0.sup.2,7 ]undec-4-one. These latter are useful perfuming and flavor-modifying ingredients.

Novel allyl ethers are found to be useful as odor modifying ingredients. The new compounds are particularly useful in the preparation of perfumes and perfume compositions as well as for the manufacture or perfumed articles such as soaps, detergents and household materials in general.

Allyl ethers in perfumery

Process for the preparation of a diketone derivative useful as perfuming and taste-modifying agent as well as intermediate for the preparation of compounds having utility in the pharmaceutical and dye-stuff industry.

Process for the preparation of 2,2,6-trimethyl-cyclohex-5-en-1,4-dione

Process for the preparation of a diketone derivative

Process for the preparation of a diketone derivative, viz 2,2,6-trimethyl-cyclohex-5-en-1,4-dione, an organoleptically interesting ingredient for the perfumery and the flavour industry, as well as a useful intermediate for the pharmaceutical industry.

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Geneva, Switzerland

Joseph J Becker