Popis: |
FVP of the title alcohol (9) at 0.65 mbar in argon atmosphere at 350 °C in the presence of seven different acidic zeolites afforded 7H-benzo[c]fluorene (13) and 6,11b-dihydro-7H-ben-zo [c]fluorene (12) as main reaction products. The suggested carbocationic reaction mechanism is supported by: 1. (a) the occurrence of two isomeric dibenzo(C9H10)hydrocarbons, namely 1,1a,6,10b-tetrahydro-1,6-methanodibenzo[a,e]cyclopropa[c]cycloheptene (6) and 9,10-dihydro-9,10-propenoanthracene (5), in the pyrolyses of 9 and 2. (b) by the results of FVP of authentic samples of 6 (conducting mainly to hydrocarbons 12 and 13), respectively 5 (affording to greatest extent the minor products observed in pyrolyses of 9). |