Non-conjugated tetraynes 1 undergo thennal intmmolecul~ cyclization to non-benzenoiddiradicals (23) followed by radical cycloaromatization at 25 ~C to provide 7-dehydro-5H-benzo[d]fluoreno[3,2-b]pyran monoradical (2 4) and alkyl radicals (2 5). Hydrogen abstraction of 2 4 gives 5H-benzo[d] fluoreno[
โฆ LIBER โฆ
Oxidative generation of an enediyne system from a 1,5-diyne precursor. A novel triggering device for enediynes
โ Scribed by Martin E. Maier; Tilmann Brandstetter
- Book ID
- 104216172
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- French
- Weight
- 329 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
13a and 13b were prepared from 2-siloxy-2-cyclohexenone 8. Oxidation of 13a and 13b with DDQ gave the enediyne 14.
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Cycloaromatization of a Non-Conjugated Polyenyne System: Synthesis of 5H-Benzo(d)fluoreno(3,2-b)pyrans via Diradicals Generated from 1-(2-(4-(2-Alkoxymethylphenyl)butan-1,3diynyl))phenylpentan-2,4-diyn-1-ols and Trapping Evidence for the 1,2-Didehydrobenzene Diradical. -Mild thermolysis of the tetr
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