Md. Banciu et al., FLOW-VACUUM PYROLYSIS OF POLYCYCLIC COMPOUNDS .10. PYROLYSIS OF CYCLOPROPA[R]-9,10-ETHANO-9,10-DIHYDROANTHRACENE, Revue Roumaine de Chimie, 41(7-8), 1996, pp. 661-666
The title hydrocarbon (11) reacts thermally by two competitive routes:
(a) a retrodiene reaction affording anthracene and (b) a sequence of
isomerizations generating 9,10-dihydro-9,10-propenoanthracene (1), 1,1
a,6,10b-tetrahydro-1,6-methano-dibenzo[a,e] cyclopropa[c]cycloheptene
(2), 11,11a-dihydro-6aH-benzo[a]fluorene (4), 6,11-dihydro-5H-benzo[a]
fluorene (5) and finally through dehydrogenation 11H-benzo[a]fluorene
(6).