| 摘要 |
PROBLEM TO BE SOLVED: To obtain a thiophene derivative that has excellent heat stability and causes a photocyclization reaction in a high quantum yield. SOLUTION: The thiophene derivative is represented by formula [1] or formula [2] (A is Ph or an S-containing five-membered ring; E is -(CH<SB>2</SB>)<SB>n</SB>- (n is 0 or 1), -O-, -S- or the like; R<SP>1</SP>, R<SP>2</SP>, R<SP>3</SP>and R<SP>4</SP>are each a hydrogen atom, a halogen atom, an alkyl group or the like). COPYRIGHT: (C)2007,JPO&INPIT
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