Compound having trimethylene structure, polymer compound containing unit that has trimethylene structure, and reactive compound having trimethylene structure

A polymer compound represented by a general formula 3 shown below:

• wherein each of R1 and R2 independently represents a group selected from the group consisting of a hydrogen atom, aliphatic substituents composed of C and H, aromatic substituents composed of C and H, aliphatic substituents composed of C, H and X, wherein X represents a hetero atom, and aromatic substituents composed of C, H and X, wherein X represents a hetero atom, Z5 represents a group selected from the group consisting of divalent aromatic rings composed of C and H, divalent aromatic rings composed of C, H and X, wherein X represents a hetero atom, divalent groups containing an aromatic ring and a double-bonded and/or triple-bonded conjugated structure composed of C and H, and divalent groups containing a double-bonded and/or triple-bonded conjugated structure composed of C, H and X, wherein X represents a hetero atom,
• each of Ar1 and Ar2 independently represents a group selected from the group consisting of divalent aromatic rings composed of C and H, and divalent aromatic rings composed of C, H and X (wherein X represents a hetero atom),
• n represents an integer of 2 or greater, and
• R1 is a hydrogen atom, and R2 is a carbon atom having not more than 2 hydrogen atoms bonded thereto.