Patent ID: 8026324

Claim:
A transition metal complex of the formula (1): wherein A represents an atom of Group 16 of the periodic table; B 1 represents an atom of Group 14 of the periodic table; M 1 represents a transition metal atom of Group 4 of the periodic table; Cp 1 represents a group having a cyclopentadiene anion backbone; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 represent independently of one another a hydrogen atom, a halogen atom, a C 1 -C 20 alkyl group optionally substituted with a halogen atom, a C 7 -C 20 aralkyl group optionally substituted with a halogen atom, a C 6 -C 20 aryl group optionally substituted with a halogen atom, a C 1 -C 20 hydrocarbon-substituted silyl group in which the hydrocarbon is optionally substituted with a halogen atom, a C 1 -C 20 alkoxy group optionally substituted with a halogen atom, a C 7 -C 20 aralkyloxy group optionally substituted with a halogen atom, a C 6 -C 20 aryloxy group optionally substituted with a halogen atom, or a C 2 -C 20 hydrocarbon-disubstituted amino group; R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 represent independently of one another a hydrogen atom, a C 1 -C 20 alkyl group optionally substituted with a halogen atom, a C 7 -C 20 aralkyl group optionally substituted with a halogen atom, or a C 6 -C 20 aryl group optionally substituted with a halogen atom, with the proviso that adjacent groups among R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 may be optionally bonded to each other to form a ring; and that a 1,3-diene consisting of R 7 , R 8 , R 9 , R 10 , R 11 , R 12 and 4 carbon atoms coordinates on M 1 without any limitation of its coordination form, and the 1,3-diene may be of either a cis or trans form, or a mixed form thereof, and the double bonds may be delocalized.