A method for producing photo-cleavable fragrance pre-cursors is described, which includes potential stereoselective method steps, agents containing the fragrance pre-cursors and the use of the fragrance pre-cursors for prolonging the scent impression in the agent and on surfaces treated with said agent.

A method for producing photo-cleavable fragrance pre-cursors is described, which includes potential stereoselective method steps, agents containing the fragrance pre-cursors and the use of the fragrance pre-cursors for prolonging the scent impression in the agent and on surfaces treated with said agent.

A method for producing photo-cleavable fragrance pre-cursors is described, which includes potential stereoselective method steps, agents containing the fragrance pre-cursors and the use of the fragrance pre-cursors for prolonging the scent impression in the agent and on surfaces treated with said agent.

Cyclohexenone and cyclohexenol compounds are provided having specific fragrances and remanence properties, along with methods for synthesizing these compounds, including obtaining the compound by condensing a ketone on an ?-methylene-aldehyde in order to obtain, by means of a domino reaction, compounds of formula (II) as follows: ##STR00001##

Cyclohexenone and cyclohexenol compounds are provided having specific fragrances and remanence properties, along with methods for synthesizing these compounds, including obtaining the compound by condensing a ketone on an ?-methylene-aldehyde in order to obtain, by means of a domino reaction, compounds of formula (II) as follows: ##STR00001##

The present invention relates to a 1-halo-2,6,14-trimethyloctadecane compound of the following general formula (1), wherein X.sup.1 represents a halogen atom. The present invention further relates to a process for preparing a 5,13,17-trimethylalkane compound of the following general formula (4), wherein n represents an integer of 14 to 18, the process comprising converting the aforesaid 1-halo-2,6,14-trimethyloctadecane compound (1) into a nucleophilic reagent, 2,6,14-trimethyloctadecyl, of the following general formula (2), wherein M.sup.1 represents Li or MgZ.sup.1, and Z.sup.1 represents a halogen atom or a 2,6,14-trimethyloctadecyl group, and subsequently subjecting the nucleophilic reagent, 2,6,14-trimethyloctadecyl compound (2), to a coupling reaction with an electrophilic alkyl reagent (3) of the following general formula (3), wherein X.sup.2 represents a halogen atom or a p-toluenesulfonyloxy group, and n is as defined above, to obtain the aforesaid 5,13,17-trimethylalkane compound (4).

##STR00001##

The present invention relates to a 1-halo-2,6,14-trimethyloctadecane compound of the following general formula (1), wherein X.sup.1 represents a halogen atom. The present invention further relates to a process for preparing a 5,13,17-trimethylalkane compound of the following general formula (4), wherein n represents an integer of 14 to 18, the process comprising converting the aforesaid 1-halo-2,6,14-trimethyloctadecane compound (1) into a nucleophilic reagent, 2,6,14-trimethyloctadecyl, of the following general formula (2), wherein M.sup.1 represents Li or MgZ.sup.1, and Z.sup.1 represents a halogen atom or a 2,6,14-trimethyloctadecyl group, and subsequently subjecting the nucleophilic reagent, 2,6,14-trimethyloctadecyl compound (2), to a coupling reaction with an electrophilic alkyl reagent (3) of the following general formula (3), wherein X.sup.2 represents a halogen atom or a p-toluenesulfonyloxy group, and n is as defined above, to obtain the aforesaid 5,13,17-trimethylalkane compound (4).

##STR00001##

A process for the stereoselective preparation of a chiral alcohol or a chiral amine, the process comprising reacting a first prochiral reactant selected from the group consisting of a ketone, an aldehyde, and an imine, with a second reactant comprising a Grignard reagent, in the presence of a chiral trans-diamine of formula (1) as defined herein:

##STR00001##

Also provided is the use of the chiral trans-diamine of formula (1) in a Grignard reaction and the chiral trans-diamines per se.

A process for the stereoselective preparation of a chiral alcohol or a chiral amine, the process comprising reacting a first prochiral reactant selected from the group consisting of a ketone, an aldehyde, and an imine, with a second reactant comprising a Grignard reagent, in the presence of a chiral trans-diamine of formula (1) as defined herein:

##STR00001##

Also provided is the use of the chiral trans-diamine of formula (1) in a Grignard reaction and the chiral trans-diamines per se.

A process for the stereoselective preparation of a chiral alcohol or a chiral amine, the process comprising reacting a first prochiral reactant selected from the group consisting of a ketone, an aldehyde, and an imine, with a second reactant comprising a Grignard reagent, in the presence of a chiral trans-diamine of formula (1) as defined herein:

##STR00001##

Also provided is the use of the chiral trans-diamine of formula (1) in a Grignard reaction and the chiral trans-diamines per se.