Use of unsaturated ketones as a perfume

Abstract

Unsaturated ketones of general formula (I) where the groups R1, R2, R3, R4 and R5 independently ═H or 1-6 C alkyl groups, which can be saturated or unsaturated, straight-chained, branched or cyclic are characerised by an interesting and original odour characteristic with good emanation and are suitable for use as perfumes, for example in cosmetic preparations, technical products or alcoholic perfumery.

1 . A use of unsaturated ketones of general structure (I)  
       
         
           
           
               
               
           
         
         where the groups R 1 , R 2 , R 3 , R 4  and R 5  independently represent H or 1-6 C alkyl groups, which can be saturated or unsaturated, straight-chained, branched or cyclic, said ketones being used as fragrances.  
       
     
     
         2 . 1-(4-methyl-cyclohex-3-en-1-yl)-4-penten-1-one.  
     
     
         3 . 3,3-dimethyl-1-(4-methylcyclohex-3-enyl)-pent-4-en-1-one.  
     
     
         4 . 1-(4-methyl-cyclohex-3-enyl)-3-propyl-pent-4-en-1-one.  
     
     
         5 . Fragrance concentrates comprising one or more of the compounds of general structure (I)  
       
         
           
           
               
               
           
         
         where the groups R 1 , R 2 , R 3 , 1 and R 5  independently represent h or 1-6 c alkyl groups, which can be saturated or unsaturated, straight-chained, branched or cyclic.  
       
     
     
         6 . Fragrance compositions having a content of one or more compounds (I) of general structure (I)  
       
         
           
           
               
               
           
         
         where the groups R 1 , R 2 , R 3 , R 4  and R 5  independently represent H or 1-6 C alkyl groups, which can be saturated or unsaturated, straight-chained, branched or cyclic, said compounds (I) being present in an amount of 1 to 70% by weight, based on the entire composition.  
       
     
     
         7 . A method of producing compounds of general structure (I)  
       
         
           
           
               
               
           
         
         where the groups R 1 , R 2 , R 3 , R 4  and R 5  independently represent H or 1-6 C alkyl groups, which can be saturated or unsaturated, straight-chained, branched or cyclic, characterized in that 1-acetyl-4-methyl-cyclo-3-hexene or 1-(1,1-diethoxyethyl)-4-methylcyclohex-3-ene is reacted, in the presence of an acidic catalyst, with olefinically unsaturated alkenols, the OH group of said alkenols being in alpha position relative to the C═C double bond of said alkenols.