Patent ID: 7608713

Claim:
A compound of formula I: wherein: R X is R 1 or R 3 , R y is R 2 or R 3 , and R Z is R 3 ; and wherein: (A) R 1 and R 2 have the following values: (i) R 1 and R 2 and the phosphorus atom to which R 1 and R 2 are bonded form a seven-to ten-membered heterobicycle; or (ii) each of R 1 and R 2 is independently: unsubstituted C 1 -C 30 alkyl; substituted C 1 -C 30 alkyl; unsubstituted C 3 -C 8 cycloalkyl; substituted C 3 -C 8 cycloalkyl; unsubstituted C 2 -C 30 alkenyl; substituted C 2 -C 30 alkenyl; unsubstituted C 2 -C 30 alkynyl; substituted C 2 -C 30 alkynyl; unsubstituted C 6 -C 18 aryl; substituted C 6 -C 18 aryl; unsubstituted C 7 -C 30 aralkyl; substituted C 7 -C 30 aralkyl; unsubstituted C 2 -C 30 heteroalkyl containing one or two heteroatoms which are N, O or S; substituted C 2 -C 30 heteroalkyl containing one or two heteroatoms which are N, O or S; unsubstituted C 3 -C 8 heterocycle containing one or two heteroatoms which are N, O or S; substituted C 3 -C 8 heterocycle containing one or two heteroatoms which are N, O or S; unsubstituted C 3 -C 30 heteroalkenyl containing one or two heteroatoms which are N, O or S; substituted C 3 -C 30 heteroalkenyl containing one or two heteroatoms which are N, O or S; unsubstituted C 3 -C 30 heteroalkynyl containing one or two heteroatoms which are N, O and S; substituted C 3 -C 30 heteroalkynyl containing one or two heteroatoms which are N, O and S; unsubstituted C 6 -C 18 heteroaryl containing one or two heteroatoms which are N, O or S; substituted C 6 -C 18 heteroaryl containing one or two heteroatoms which are N, O or S; unsubstituted C 7 -C 30 heteroaralkyl containing one or two heteroatoms which are N, O or S; and substituted C 7 -C 30 heteroaralkyl containing one or two heteroatoms which are N, O or S; and (B) R 3 is selected from: with the proviso that when R X and R Y are ethyl, R 3 cannot be 3-oxo-cyclopentyl.