| 主权项 |
1. A compound of the formula I or II below: wherein: X is O, S or SO2, Y is OH or C1 to C10 alkyl, R1, R2 and R4 are each independently selected from H and C1 to C6 alkyl, R3 is selected from a functional group selected from H, C1 to C6 alkyl, and a carbonyl-containing group, R12 is H, alkenyl, aryl, trihaloalkyl and C1 to C6 alkyl, R5 and R7 are each a group of the formula L1-L2-R6 or L2-L1-R6, where L1 is a linker of the formula —[CR8R9]12—, where n is an integer of from 0 to 12, and R8 and R9 are each independently selected from H or C1 to C2 alkyl, and where L2 is absent or a linker that is selected from O, S, SO, SO2, N(R′), C(O), C(O)O, OC(O), [O(CR′2)r]s, [(CR′2)rO]sCH(OR′), C(O)N(R′), N(R′)C(O), N(R′)C(O)N(R′), SO2N(R′) or N(R′)SO2 where R′ and R″ are each independently selected from hydrogen and a C1 to C2 alkyl, and where r is 1 or 2 and s is 1 to 4, and where R6 is selected from OR13, heterocyclic and C1 to C25 hydrocarbyl group, wherein R13 is a C1 to C6 alkyl, and said heterocyclic and hydrocarbyl group is optionally substituted with at least one functional group selected from alkenyl, alkyl, aryl, halo, trihaloalkyl, alcohol, keto, S(O)R13, sulfonyl, thio-alcohol, ester, thioester, ether, thioether, amide, thioamide, urea, thiourea, ═O, ═S, amine and heterocyclic group. |
