Patent ID: 8163461

Claim:
An anion of Formula I: wherein A 2 is O or N; n 2 is 1_when A 2 is O and n 2 is 2 when A 2 is N; n 3 is 0 to about 10; Y 1 is CH 2 and Y 2 is direct bond, or Y 1 is direct bond and Y 2 is CH 2 ; one of R 1-5 is a direct bond to the group Y 2 and each of the remaining R 1-5 is independently H, hydroxyl protecting group, alkyl, cycloalkyl, heterocycle, aryl, heteroaryl, or saccharide; linker is a diradical carbon chain comprising one to about 20 carbon atoms wherein the chain is optionally interrupted by one to five oxygen atoms, and each carbon atom is substituted with zero, one, or two halo groups, or linker is a direct bond; any alkyl, cycloalkyl, heterocycle, aryl, heteroaryl, or saccharide is optionally substituted with one to five halo, (C 1 -C 6 )alkyl, alkoxy, acyl, alkoxyacyl, acyloxy, trifluoromethyl, trifluoromethoxy, hydroxy, cyano, carboxy, nitro, oxo, or —N(R x ) 2 groups, wherein each R x is independently H, alkyl, aryl, acyl, or aroyl.