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- W2024489014 abstract "The photochromic title hydrocarbon undergoes a photochemical 1,5-H shift to 4-fluoren-9-yl-2-methylpenta-1,3-diene and photocyclisation to red 3,3a-dihydro-1,3,3-trimethylfluoranthene; the latter undergoes a thermal 1,9-H shift in toluene and a photochemical 1,7-H shift in ethanol. The title ketone (17) cyclises in the presence of hydrogen bromide in acetic acid to yield 1,10b-dihydro-1,1,3-trimethylfluoranthene which, on catalytic hydrogenation, yields the same tetrahydrofluoranthene derivative as is obtained when 2-fluoren-9-yl-2-methylpentan-4-ol (20) is cyclised with sulphuric acid. On treatment with PCl5, the ketone (17) yields 4-chloro-2-fluoren-9-yl-2-methylpent-4-ene, which reacts with sodium in xylene to give trans-2-fluoren-9-yl-2-methylpent-3-ene, obtained also when the alcohol (20) is heated at 180 °C with KHSO4." @default.
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- W2024489014 date "1984-01-01" @default.
- W2024489014 modified "2023-09-26" @default.
- W2024489014 title "Reactions of 4-fluoren-9-ylidene-2-methylpent-2-ene and 2-fluoren-9-yl-2- methylpentan-4-one" @default.
- W2024489014 doi "https://doi.org/10.1039/p19840002871" @default.
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