RING COMPOUND

A compound represented by the following formula (1): wherein, Y 1 , Y 2 , Y 3 and Y 4 represent a group represented by any of the above formulae; P 1 , P 2 , P 3 and P 4 are an atomic group required for forming an aromatic heterocyclic ring; P 5 and P 6 are an atomic group required for forming an aromatic ring; Z 1 and Z 2 represent OR ± , -SR ± or -NR ± 2 , wherein R ± represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; Q 1 and Q 2 represent a direct bond or a linking group; a P 1 -containing ring and a P 2 -containing ring are bonded to form Q 1 -containing fused structure; a P 3 -containing ring and a P 4 -containing ring are bonded to form Q 2 -containing fused structure; can be used as a ligand of a metal complex, and the metal complex is useful for a catalyst.