Patent ID: 7501510

Claim:
An N,N′-disubstituted thiourea ligand represented by structure I: wherein n is an integer in the range of 1 to 8 inclusive; R 1 and R 2 are independently for each occurrence cycloalkyl, aryl, aralkyl, or —(CH 2 ) m —R 80 ; R 3 , R 4 , R 5 , and R 6 are independently for each occurrence H, alkyl, halogenated alkyl, cycloalkyl, aryl, aralkyl, —(CH 2 ) m —R 80 , COOR v (where R v =alkyl, cycloalkyl, aryl, aralkyl, and —(CH 2 ) m —R 80 ), and CONR u R v (where R u or R v =H, alkyl, cycloalkyl, aryl, aralkyl, and —(CH 2 ) m —R 80 ); R 80 represents unsubstituted or substituted aryl, cycloalkyl, cycloalkenyl, or another polycycle; m is independently for each occurrence an integer in the range of 0 to 8 inclusive; and the N,N′-disubstituted thiourea ligand, when chiral, is a mixture of enantiomers or a single enantiomer.