| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a benzofluorene compound applicable to an organic electroluminescent element and exhibiting excellent performance. <P>SOLUTION: The benzofluorene compound is expressed by general formula (1), wherein a benzene ring condensed to a 5-membered ring is replaced with diphenylamino, and the ortho-position of the phenyl group is replaced with alkyl, aryl, heteroaryl or cycloalkyl. In the formula, R<SP POS="POST">1</SP>, R<SP POS="POST">2</SP>, R<SP POS="POST">3</SP>and R<SP POS="POST">4</SP>are each independently hydrogen, alkyl, aryl, heteroaryl or cycloalkyl, provided that R<SP POS="POST">1</SP>, R<SP POS="POST">2</SP>, R<SP POS="POST">3</SP>and R<SP POS="POST">4</SP>are not hydrogen at the same time; R<SP POS="POST">5</SP>and R<SP POS="POST">6</SP>are each independently alkyl, aryl, heteroaryl or cycloalkyl; n1 and n2 are each independently an integer of 0-3; when n1 or n2 is≥2, two or more R<SP POS="POST">5</SP>groups or two or more R<SP POS="POST">6</SP>groups may be bonded with each other to form a ring; and R<SP POS="POST">7</SP>groups are each independently alkyl or aryl which may be replaced with 1-4C alkyl, or two R<SP POS="POST">7</SP>groups may be bonded together to form a ring. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
