Firmenich Sa

Walter Schenk

Karl H Schulte-Elte

Erling Sundt

Joseph J Becker

Michel Joyeux

Roland Aschiero

Roger Chappaz

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

Use of certain ester derivatives of 1,3-dimethyl-but-3-en-1-yl as perfuming and flavoring ingredients. These ester derivatives possess the following formula ##STR1## wherein symbol R represents a hydrogen atom, a saturated or an unsaturated, linear or branched lower alkyl having 1 to 6 carbon atoms, or an aryl radical. The compounds of formula (I) are new chemical entities.

Esters of 1,3-dimethyl-but-3-en-1-yl, their utilization as perfuming and

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

New lactones having the formula ##STR1## wherein the cyclohexyl radical is bound to the carbon atoms at position 3 or 4 as indicated by the dotted lines, their use as perfuming ingredients and process for their preparation.

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Geneva, Switzerland

Walter Schenk