Compound, novel ligand, novel transition metal complex, and catalyst including novel transition metal complex

A compound represented by General Formula (1) or (2) and having a total of 15 to 110 carbon atoms:

• R1R2R3A (1)
• R1R2A-Y-AR3R4 (2)
• wherein A is phosphorus or arsenic;
• R1, R2, R3 and R4 are each independently a pyridyl group having optionally different electron-withdrawing groups bonded to both positions meta to the atom A as well as hydrogen atoms bonded to both positions ortho to the atom A;
• and Y is a divalent group derived from a C2-20, optionally substituted and optionally heteroatom-containing, aliphatic, alicyclic or aromatic compound or from ferrocene, and
• provided that the nitrogen atom in the pyridine ring has the lowest number (1-position), the positions meta to the atom A are the 2-position and the 6-position, and the optionally different electron-withdrawing groups are bonded to both the 2-position and the 6-position, and the positions ortho to the atom A are the 3-position and the 5-position, and hydrogen atoms are bonded to both the 3-position and the 5-position.