Photo-labile pro-fragrance conjugates

Abstract

The present invention relates to photo-labile pro-fragrance conjugates comprising: a) a photo-labile unit which upon exposure to electromagnetic radiation is capable of releasing a pro-fragrance unit; and b) a pro-fragrance unit, which when so released is either i) a pro-fragrance compound capable of releasing a fragrance raw material; or ii) a fragrance raw material. The present invention relates to systems for delivering fragrances to a situs, and to laundry detergent compositions, fine fragrances, personal care and hair care compositions comprising said systems.

1 . A photo-labile pro-fragrance conjugate having the formula:  
       
         
           
           
               
               
           
         
         wherein R is a unit capable of releasing a fragrance raw material having the formula:  
         
           
             
             
                 
                 
             
           
         
         wherein R 5  units are selected from:  
         a) C 6 -C 22  substituted or unsubstituted linear alkyl  
         b) C 6 -C 22  substituted or unsubstituted branched alkyl;  
         c) C 6 -C 22  substituted or unsubstituted linear alkenyl;  
         d) C 6 -C 22  substituted or unsubstituted branched alkenyl;  
         e) C 6 -C 22  substituted or unsubstituted cycloalkyl;  
         f) C 6 -C 22  substituted or unsubstituted branched cycloalkyl;  
         g) C 6 -C 22  substituted or unsubstituted cycloalkenyl;  
         h) C 6 -C 22  substituted or unsubstituted branched cycloalkenyl;  
         i) C 6 -C 22  substituted or unsubstituted aryl;  
         j) C 6 -C 22  substituted or unsubstituted heterocyclicalkyl;  
         k) C 6 -C 22  substituted or unsubstituted heterocyclicalkenyl;  
         l) and mixtures thereof;  
         R 6  is selected from the group consisting of hydrogen and methyl; each R 7  is independently hydrogen, methyl or —C(O)OR 9 , and mixtures thereof; R 9  is hydrogen, C 1 -C 12  alkyl, and mixtures thereof;  
         each R 1  is independently hydrogen, a unit which can substitute for hydrogen, C 1 -C 12  substituted or unsubstituted hydrocarbyl unit;  
         each R 2  is independently hydrogen, C 1 -C 12  substituted or unsubstituted hydrocarbyl unit, and mixtures thereof;  
         X is —OH.  
       
     
     
         2 . A compound according to  claim 1  wherein R has the formula:  
       
         
           
           
               
               
           
         
         wherein R 6  is selected from the group consisting of hydrogen and methyl.  
       
     
     
         3 . A compound according to  claim 1  wherein R has the formula:  
       
         
           
           
               
               
           
         
         wherein R 6  is selected from the group consisting of hydrogen and methyl; each R 7  is independently hydrogen, methyl or —C(O)OR 9 , and mixtures thereof; R 9  is hydrogen, C 1 -C 12  alkyl, and mixtures thereof.  
       
     
     
         4 . A composition according to  claim 1  having the formula:  
       
         
           
           
               
               
           
         
       
     
     
         5 . A composition according to  claim 1  having the formula:  
       
         
           
           
               
               
           
         
       
     
     
         6 . A photo-labile pro-fragrance conjugate delivery system comprising: 
 A) from about 0.001% by weight, of a photo-activated pro-fragrance conjugate according to  claim 1;  and    B) the balance carriers and adjunct ingredients.    
     
     
         7 . A laundry detergent comprising: 
 A) from about 0.001% by weight, of a photo-activated pro-fragrance conjugate according to  claim 1;     B) from about 10% by weight, of a detersive surfactant; and    C) the balance carriers and adjunct ingredients.    
     
     
         8 . A perfume or fine fragrance comprising: 
 A) from about 0.001% by weight, of a photo-activated pro-fragrance conjugate according to  claim 1;     B) from about 0.01% to about 99% by weight, of an admixture of fragrance raw materials; and    C) the balance carriers and adjunct ingredients.    
     
     
         9 . A hair shampoo or conditioner comprising: 
 A) from about 0.001% by weight, of a photo-activated pro-fragrance conjugate according to  claim 1;     B) from about 0.01% to about 5% by weight, of an admixture of fragrance raw materials; and    C) the balance carriers and adjunct ingredients.