Patent ID: 7635776

Claim:
An optically active ligand represented by the formula (1): R 1 R 2 N-Q 1 -X-Q 2 -NR 3 R 4 (1) wherein R 1 , R 2 , R 3 and R 4 are each the same or different and represent a group represented by the formula (2): wherein Q 3 is an optionally substituted alkylene group, an optionally substituted cycloalkylene group, an optionally substituted arylene group or an optionally substituted divalent heterocyclic group; R 5 is an optionally substituted alkyl group, an optionally substituted aryl group or an optionally substituted heterocyclic group; and R 6 is a substituent which may coordinate or bind to a metal atom, or R 5 and R 6 , taken together, may form a ring, Q 1 and Q 2 are each the same or different and represent an optionally substituted alkylene group or a single bond, and X is a divalent spacer.