Compound

Abstract

A compound having Formula I wherein one of R 1 and R 2 is a group of the formula wherein R 4 is selected from H and hydrocarbyl, R 5 is a hydrocarbyl group and L is an optional linker group, or R 1 and R 2 together form a ring substituted with the group wherein R 3 is H or a substituent, and wherein X is selected from S, O, NR 6 and C(R 7 )(R 8 ), wherein R 6 is selected from H and hydrocarbyl groups, wherein each of R 7 and R 8 are independently selected from H and hydrocarbyl groups.

1 - 38 . (canceled) 
     
     
         39 . A compound having Formula I 
       
         
           
           
               
               
           
         
         wherein one of R 1  and R 2  is a group of the formula 
       
       
         
           
           
               
               
           
         
         
           wherein R 4  is selected from H and hydrocarbyl, R 5  is a hydrocarbyl group and L is an optional linker group, 
         
         or R 1  and R 2  together form a ring substituted with the group 
       
       
         
           
           
               
               
           
         
         wherein R 3  is H or a substituent 
         and wherein X is selected from S, O, NR 6  and C(R 7 )(R 8 ), wherein R 6  is selected from H and hydrocarbyl groups, wherein each of R 7  and R 8  are independently selected from H and hydrocarbyl groups.