1927
DOI: 10.1002/cber.19270600251
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Untersuchungen über Perylen und seine Derivate (XII.)

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1930
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Cited by 13 publications
(1 citation statement)
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“…Hafner's elegant preparation of azulene derivatives involves the formation of the seven-membered ring by fusion of a fixre carbon chain from a pyrylium salt onto the five-membered ring of sodium cyclopentadienide. 3 It xvas hoped that substitution of the disodium salt of eyclooctatetraene4 for the cyclopentadienide would not alter the sense of the reaction, so that there would be obtained hydrocarbons xvith fused seven-and eightmembered rings and extended conjugated doublebond systems.…”
mentioning
confidence: 99%
“…Hafner's elegant preparation of azulene derivatives involves the formation of the seven-membered ring by fusion of a fixre carbon chain from a pyrylium salt onto the five-membered ring of sodium cyclopentadienide. 3 It xvas hoped that substitution of the disodium salt of eyclooctatetraene4 for the cyclopentadienide would not alter the sense of the reaction, so that there would be obtained hydrocarbons xvith fused seven-and eightmembered rings and extended conjugated doublebond systems.…”
mentioning
confidence: 99%