Patent ID: 7858784

Claim:
A ligand represented by I: wherein R is selected independently for each occurrence from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, aralkyl, heteroaralkyl, and —(CH 2 ) m —R 10 ; R 1 , R 2 , R 3 , and R 4 are selected independently for each occurrence from the group consisting of hydrogen, halogen, alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, aralkyl, heteroaralkyl, —OR 11 , —N(R 11 ) 2 , —Si(R 11 ) 3 , and —(CH 2 ) m —R 10 ; or any two adjacent instances of R 1 , R 2 , R 3 and R 4 , taken together with the carbons to which they are bound, form a five- or six-membered substituted or unsubstituted aryl or heteroaryl ring; provided that at least two of R 1 , R 2 , R 3 and R 4 are —OR 11 ; R 5 , and R 9 are selected independently for each occurrence from the group consisting of hydrogen, alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, aralkyl, heteroaralkyl, —Si(R 11 ) 3 , and —(CH 2 ) m —R 10 ; R 7 is selected independently for each occurrence from the group consisting of alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, aralkyl, heteroaralkyl, —Si(R 11 ) 3 , —(CH 2 ) m —R 10 , —OH, —OR 11 , —NH 2 , —NHR 11 , and —N(R 11 ) 2 ; R 6 and R 8 are selected independently for each occurrence from the group consisting of hydrogen, lower alkyl and halogen; or any two adjacent instances of R 5 , R 6 , R 7 , R 8 , or R 9 , taken together with the carbons to which they are bound, form a five- or six-membered substituted or unsubstituted aryl or heteroaryl ring; R 10 represents an unsubstituted or substituted aryl, cycloalkyl, cycloalkenyl, heterocycle, or polycycle, wherein polycycle refers to two or three rings, each ring independently selected from the group consisting of cycloalkyls, cycloalkenyls, cycloalkynyls, aryls and heterocyclyls, in which two or more carbons are shared by adjoining rings; R 11 is selected independently for each occurrence from the group consisting of alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, aralkyl, and heteroaralkyl; m is independently for each occurrence an integer in the range 0 to 8 inclusive; and the ligand is achiral or, when chiral, is a single stereoisomer or a mixture of stereoisomers.