Patent ID: 6867250

Claim:
A compound of formula II wherein each Z is nitrogen; X is hydrogen or a blocking group selected from —COR a , —SO 2 R b , SiR c R d R e , —PR f R g , —POR f R g , and _CONHR h , wherein R a is a C 1 -C 8 alkyl, halogen-substituted C 1 -C 8 alkyl, C 5 -C 12 cycloalkyl, C 2 -C 8 alkenyl, —CH 2 —CO—CH 3 , C 1 -C 12 alkoxy, and phenyl or phenoxy which is unsubstituted or substituted by C 1 -C 12 alkyl, C 1 -C 4 alkoxy, halogen or benzyl; R b is a C 1 -C 12 alkyl, C 6 -C 10 aryl and C 7 -C 18 alkylaryl; R c , R d , and R e is independently selected from C 1 -C 8 alkyl, cyclohexyl, phenyl or C—C 8 alkoxy, R f , and R g is independently selected from C 1 -C 12 alkoxy, C 1 -C 12 alkyl, C 5 -C 12 cycloalkyl, and phenyl or phenoxy which is unsubstituted or substituted by C 1 -C 12 alkyl, C 1 -C 4 alkoxy, halogen or benzyl; and R h is a C 1 -C 8 alkyl, C 5 -C 12 cycloalkyl, C 2 -C 8 alkenyl, —CH 2 —CO—CH 3 , or phenyl which is unsubstituted or substituted by C 1 -C 12 alkyl, C 2 -C 8 alkenyl, C 1 -C 4 alkoxy, halogen or benzyl; C is either L is a straight alkyl, branched alkyl or cycloalkyl of between 1 and 20 carbons optionally interrupted by one or more oxygen atoms, having one or more of the hydrogens in the alkyl chain substituted for by a hydroxyl group, or terminating with a carbonyl functionality of general structure —CO—M, wherein M is a OR x , NR x R y wherein R x and R y are independently hydrogen or an alkyl group of between 1 and 8 carbons that optionally have one or more of the hydrogens substituted for by a hydroxyl group; each of R 3 and R 4 are independently a hydrogen, hydrocarbyl, halogen, hydroxyl, cyano, —O(hydrocarbyl), —O(functional hydrocarbyl), —N(hydrocarbyl)(hydrocarbyl), —N(hydrocarbyl)(functional hydrocarbyl), —N(functional hydrocarbyl)(functional hydrocarbyl), —S(hydrocarbyl), —S(functional hydrocarbyl), —SO 2 (hydrocarbyl), —SO 3 (hydrocarbyl), —SO 2 (functional hydrocarbyl), —SO 3 (functional hydrocarbyl), —COO(hydrocarbyl), COO(functional hydrocarbyl), —CO(hydrocarbyl), —CO(functional hydrocarbyl), —OCO(hydrocarbyl), —OCO(functional hydrocarbyl), —CONH 2 , —CONH(hydrocarbyl), —CONH(functional hydrocarbyl), —CON (hydrocarbyl)(hydrocarbyl), —CON(functional hydrocarbyl)(hydrocarbyl), —CON(functional hydrocarbyl)(functional hydrocarbyl), or a hydrocarbyl group substituted by any of the above groups; and each R 1 and R 2 is identical or different and is independently a hydrocarbyl group of between 1 and 20 carbons, wherein R 1 and R 2 are attached to an aromatic benzene ring so that they are ortho to each other.