Polymer compound and organic transistor using same

A method for producing a compound represented by the formula (8), wherein the method comprises a step of reacting a compound represented by the formula (7) with a metal hydride:

• wherein each E independently represents —O—, —S— or —Se—;
• each R1 independently represents a hydrogen atom, an alkyl group which optionally has a substituent, an alkoxy group which optionally has a substituent, an alkylthio group which optionally has a substituent, an aryl group, a heteroaryl group or a halogen atom;
• each R2 independently represents a hydrogen atom, an alkyl group which optionally has a substituent, an aryl group, a heteroaryl group or a halogen atom, or two R2s are linked to form a ring and each of the other R2s independently represents a hydrogen atom, an alkyl group which optionally has a substituent, an aryl group, a heteroaryl group or a halogen atom;
• and each R6 independently represents a hydrogen atom, an alkyl group which optionally has a substituent, an alkoxy group which optionally has a substituent, an alkylthio group which optionally has a substituent, an aryl group, a heteroaryl group or a halogen atom;
• wherein E, R1, R2 and R6 have the same meanings as those described above.