Patent ID: 6906212

Claim:
A compound having the formula 1: wherein R and R 3 are substituted or unsubstituted, branched- or straight-chain C 1 -C 20 alkyl, substituted or unsubstituted C 3 -C 8 cycloalkyl, substituted or unsubstituted C 6 -C 20 carbocyclic aryl, or substituted or unsubstituted C 4 -C 20 heteroaryl having one to three heteroatoms wherein the heteroatoms are selected from sulfur, nitrogen, and oxygen; R 1 and R 2 are, independently, achiral or substantially enantiomerically pure, substituted or unsubstituted, branched- or straight-chain C 1 -C 20 alkyl, substituted or unsubstituted C 3 -C 8 cycloalkyl, substituted or unsubstituted C 6 -C 20 carbocylic aryl, substituted or unsubstituted C 4 -C 20 heteroaryl having one to three heteroatoms wherein the heteroatoms are selected from sulfur, nitrogen, and oxygen, or R 1 and R 2 collectively represent a substituted or unsubstituted achiral, chiral and racemic, or substantially enantiomerically pure divalent alkylene, cycloalkylene or arylene radical wherein the chain of carbon atoms in the main chain that joins the amidite oxygen atoms in formula 1 contains 2 to about 8 carbon atoms; L is a divalent chiral radical selected from substituted or unsubstituted, branched- or straight-chain C 1 -C 20 alkylene, substituted or unsubstituted C 3 -C 8 cycloalkylene, substituted or unsubstituted C 6 -C 20 carbocyclic arylene, substituted or unsubstituted C 4 -C 20 heteroarylene having one to three heteroatoms wherein the heteroatoms are selected from sulfur, nitrogen, and oxygen, or substituted or unsubstituted metallocenylmethylene, wherein L is substantially enantiomerically pure.