
TY  - JOUR
A1  - Brown, RFC 
A1  - Choi, N 
A1  - Eastwood, FW 
T1  - Cyclopent[a]iondene (Benzopentalene) and Pentalene: Pyrolytic Formation From 3-Phenyl- and 3-Vinyl-phthalic Anhydrides
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1995
VL  - 48
IS  - 2
SP  - 185
EP  - 198
KW  - 
UR  - https://doi.org/10.1071/CH9950185 
N2  - Pyrolysis of 3-phenylphthalic anhydride at 900&#176;/0.02mm gives cyclopent [a]indene, characterized by 1H n.m.r. at -70&#176; and by formation of a cyclopentadiene adduct and of a dimer at room temperature. Pyrolysis of 3,4-, 3,5- and 3,6-diphenylphthalic anhydrides also gives much cyclopent [a]indene by loss of the additional phenyl group. 3,4-Diphenylphthalic anhydride forms triphenylene as the major product. The pyrolysate from 3-vinylphthalic anhydride contains the known dimer of pentalene , and phenylacetylene. Pyrolyses of 3-(1-naphthyl) phthalic anhydride and of 4-phenylphenanthrene-2,3-dicarboxylic anhydride are described. 
ER  -

