Transition metal compound and catalyst for olefin polymerization

A transition metal compound represented by formula (1),

• wherein M is a metal element of the groups 3 to 10 of the Periodic Table or a lanthanoid;
• X represents a ligand having a sigma bond for binding to M, and when X is plural, the Xs may be the same or different;
• Y represents a Lewis base, and when Y is plural, the Ys may be the same or different;
• A1 and A2 represent crosslinking groups and at least one thereof has a boron or phosphorous atom as a crosslinking atom, the crosslinking group having a boron atom as a crosslinking atom is represented by the formula (4) and the crosslinking group having a phosphorous atom as a crosslinking atom is represented by formula (5);
• q is an integer of 1 to 5 and equals [(the valance of M)−2];
• r is an integer of 0 to 3;
• and
• Q1 and Q2 have a structure represented by formula (2) or (3), and Q1 and Q2 may be different or the same,
• wherein R1 to R3 are a hydrogen atom, a halogen atom, a hydrocarbon group with 1 to 20 carbon atoms, a halogen-containing hydrocarbon group with 1 to 4 carbon atoms, a silicon-containing group or a hetero-atom-containing group,
• wherein R4 is a hydrogen atom or a hydrocarbon group with 1 to 20 carbon atoms,
• wherein E is a boron atom;
• and
• R5 is an electrically neutral basic group containing nitrogen, oxygen, phosphorous or sulfur, or a group having a negative charge containing N−,
• wherein E is a phosphorous atom;
• R5 is a hydrocarbon group having 1 to 20 carbon atoms;
• and
• R6 is ═N—R7 (wherein R7 is an alkyl group, alkenyl group, arylalkyl group or aryl group) or ═S.