Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

A compound of the formula (I) ##STR00001##
in which, independently, R.sub.1 is selected from H and methyl; R.sub.2 is selected from H, and methyl; R.sub.3 is selected from H, methyl and ethyl; R.sub.4 is selected from H, methyl and ethyl; or R.sub.3 and R.sub.4 together form a ring in which n is 1 or 2. The compounds have the characteristic desirable odour qualities of the Damascone molecules, but lack their disadvantageous skin sensitization effects.

Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

A compound of the formula (I)

##STR00001##

in which, independently, R.sub.1 is selected from H and methyl; R.sub.2 is selected from H, and methyl; R.sub.3 is selected from H, methyl and ethyl; R.sub.4 is selected from H, methyl and ethyl; or R.sub.3 and R.sub.4 together form a ring in which n is 1 or 2.

The compounds have the characteristic desirable odour qualities of the Damascone molecules, but lack their disadvantageous skin sensitization effects.

The present invention relates to use of at least one compound of formula (I) as aroma ingredient. The compound of formula (I) is used to impart an aroma impression which is reminiscent of a sweet note, technical note, tobacco note, balsamic note, herbal note, fruity note, woody note, pine needle note, eucalyptus note, powdery note, or a combination of two or more notes to a composition and also enhancing and/or modifying the aroma of a composition. The present invention is further directed to a composition comprising compound of formula (I) and (i) at least one aroma chemical different from compound of formula (I) or (ii) at least one non-aroma chemical carrier, or (iii) both (i) and (ii).

Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

The invention relates to a vetiveryl ester comprising at least 0.5 weight percent of secondary alcohol compounds with respect to the total weight of the vetiveryl ester and to a process for the preparation a vetiveryl ester, the process comprising: providing a vetiver oil, at least one enzyme preparation and at least one acylating compound; and allowing sufficient time for the enzyme preparation to esterify the alcohol compounds of the vetiver oil with the acylating compound. The invention also relates to a vetiveryl ester obtainable by the above process, a fragrance composition comprising an above-mentioned vetiveryl ester and the use of an above-mentioned vetiveryl ester for the preparation of a perfumed product.

The various aspects presented herein relate to the perfumery industry. More particularly, the various aspects presented herein relate to malodor counteracting compositions and/or ingredients, methods for counteracting malodors, as well as to the perfumed articles or perfuming compositions comprising as an active ingredient, at least one compound selected from the group consisting of: a compound of Formula (I), a compound of Formula (II), a compound of Formula (III), a compound of Formula (IV), and mixtures thereof.

The various aspects presented herein relate to the perfumery industry. More particularly, the various aspects presented herein relate to malodor counteracting compositions and/or ingredients, methods for counteracting malodors, as well as to the perfumed articles or perfuming compositions comprising as an active ingredient, at least one compound selected from the group consisting of: a compound of Formula (I), a compound of Formula (II), a compound of Formula (III), a compound of Formula (IV), and mixtures thereof.