Firmenich Sa

Herve Pamingle

Karl-Heinrich Schulte-Elte

Christian Chapuis

Christian Vial

Christian Margot

Roger L Snowden

Jean-Marc Gaudin

Bernard L Muller

Optically active esters and their use as perfuming ingredients

The present invention relates to the use in perfumery of compounds of the general formulae ##STR1## in which R.sup.1 and R.sup.2 are identical or different and represent each a methyl or ethyl group, R.sup.3 represents hydrogen or an alkyl group from C.sub.1 to C.sub.4, linear or branched, and R.sup.4 represents hydrogen, an alkyl group from C.sub.1 to C.sub.4, linear or branched, or an acyl group of formula R.sup.5 C(O)--, R.sup.5 being hydrogen or an alkyl group from C.sub.1 to C.sub.4, linear or branched. The novel odoriferous character of these compounds is the combination of woody with fruity notes. Also described is a synthesis for the preparation of the compounds of formula (I) starting from the compounds of formula (II).

Perfuming ingredients of woody, fruity odor

3-Methyl-2-oxo-ethylpentanoate or an isomer thereof are very useful compounds in the field of perfumery, having an unusual, fruity odor note that can be described as a fresh walnut odor together with a rum type note.

Utilization of 3-methyl-2-oxo-ethyl-pentanoate as a perfuming ingredient

The use of 1-methoxy-2-methyl-3-phenylpropane, 3-methoxy-2,2,3-trimethyl-1-phenylbutane or of 1-(2-methoxypropyl)-4-methylbenzene as perfuming ingredients is described. These two compounds possess an excellent stability in aggressive media and/or at high pH-values, which renders them very useful for application in chlorine bleach. The odor of these two compounds can be described as being of the green type with a nice, strong floral note.

Use of 1-methoxy-2-methyl-3-phenylpropane,

Novel compounds of formula ##STR1## wherein the dotted lines indicate the location of a single or double bond, symbol R.sup.1 stands for a hydrogen atom or a methyl radical, symbol R.sup.2 represents a linear or branched, saturated or unsaturated, C.sub.1 to C.sub.4 alkyl radical, provided that R.sup.1 is not hydrogen when R.sup.2 represents a methyl or n-propyl radical and the ring is saturated. Compounds (Ia) are useful as perfuming ingredients. A process for their preparation is disclosed.

Cyclic ketones and their use as perfuming ingredients

New 4,4,5,8-tetramethyl-1-oxaspiro[2,5]octane. A process for its preparation starting from 2,2,3,6-tetramethyl-1-cyclohexanone is described. 4,4,5,8-Tetramethyl-1-oxaspiro[2,5]octane is a useful raw material for the preparation of 2,2,3,6-tetramethyl-cyclohexane-carbaldehyde, a key intermediate for the synthesis of valuable fragrance ingredients.

2,2,3,6-tetramethyl-cyclohexane-carbaldehyde

New 4,4,5,8-tetramethyl-1-oxaspiro[2.5]octane. A process for its preparation starting from 2,2,3,6-tetramethyl-1-cyclohexanone is described. 4,4,5,8-Tetramethyl-1-oxaspiro[2.5]octane is a useful raw material for the preparation of 2,2,3,6-tetramethyl-cyclohexane-carbaldehyde, a key intermediate for the synthetis of valuable fragrance ingredients.

Tetramethyl-1-oxaspiro[2.5]octane

Novel cycloaliphatic alcohols of formula ##STR1## wherein each of symbols R.sup.1 and R.sup.2 designates a methyl radical or wherein R.sup.1 designates an ethyl radical and R.sup.2 stands for a methyl radical or a hydrogen atom, possess useful fragrance properties and consequently can be used in the perfume industry. A process for their preparation starting from an allenic carbinol is disclosed.

Aliphatic alcohols, their preparation and use of same as perfuming

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

New tricyclic compounds and use thereof as perfume ingredients. Perfume compositions and perfumed articles containing same.

Growing community of inventors

Versoix, Switzerland

Herve Pamingle