CYCLOPENT[A]INDENE (BENZOPENTALENE) - GENERATION BY FLASH VACUUM PYROLYSIS AND SUBSEQUENT DIMERIZATION

• Published in: Tetrahedron letters Vol. 35; no. 25; pp. 4405 - 4408
• Main Authors: BROWN, RFC, CHOI, N, COULSTON, KJ, EASTWOOD, FW, WIERSUM, UE, JENNESKENS, LW
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier 20.06.1994
• Subjects: Chemistry; Chemistry, Organic; Physical Sciences; Science & Technology; ANHYDRIDE

Cyclopent[a]indene (benzopentalene, 7) is generated by flash vacuum pyrolysis of 3-phenylphthalic anhydride (6), biphenylene (3) or diphenic anhydride (4). It dimerises readily and adds cyclopentadiene above -70 degrees C, but it does not equilibrate at 900 degrees C with as-indacene (1).