Results 161 to 170 of about 23,422 (216)

Synthesis of derivatives of aza[14]annulene, aza[16]annulene, aza[18]annulene, aza[20]annulene, and aza[22]annulene, diatropic and paratropic vinylogues of pyridine

Journal of the Chemical Society, Perkin Transactions 1, 1986
Syntheses of the tetradehydroaza[14]annulene (5), the tetradehydroazabenz[14]annulene (6), the tetra-dehydroazadibenz[14]annulene (7), the tetradehydroaza[16]annulene (8), the tetradehydroaza[18]-annulene (9), the tetradehydroaza[20]annulene (10), and the tetradehydroaza[22]annulene (11) are described.
J?ro Ojima, Tetsuya Nakada, Emiko Ejiri, Mitsunobu Nakamura   +3 more
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[10]annulene: Electrocyclization mechanisms

Journal of Computational Chemistry, 2021
AbstractThe mechanism of 6‐π electrocyclization of all‐cis, mono‐trans, and double‐trans [10]annulene to yield 4a,8a‐dihydronaphthalene has been explored at various quantum‐chemical methods. The mono‐trans configuration cyclizes preferentially to trans‐4a,8a‐dihydronaphthalene, in agreement with the experimental results.
Raúl Palmeiro, Obis Castaño
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Subphthalocyanine−Dehydro[18]annulenes

Organic Letters, 2007
A subphthalocyanine trimer built around a dehydro[18]annulene core was prepared. The synthesis was achieved through direct homocoupling of an ortho-diethynyl-functionalized subphthalocyanine, obtained by palladium-catalyzed cross-coupling of the corresponding diiodo-subphthalocyanine with an ethynyl derivative.
Rodrigo S, Iglesias, Christian G, Claessens, M Angeles, Herranz, Tomas, Torres   +3 more
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ChemInform Abstract: ANNULENE 21. MITT. MONOSUBSTITUIERTE (16)ANNULENE

Chemischer Informationsdienst, 1974
AbstractDie durch Codimerisierung der Cyclooctatetraene (I) und (II) erhaltenen Tricyclo‐ Verbindungen (III) liefern bei Bestrahlung die Titelverbindungen (IV).
GERHARD SCHROEDER, GERALD KIRSCH, JEAN F. M. OTH   +2 more
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ChemInform Abstract: ANNULENES. 26. CONCERNING OXA(17)ANNULENES

Chemischer Informationsdienst, 1978
AbstractEpoxidierung des Cyclooctatetraen‐Dimeren (I) gibt die 3 Monoepoxide (II)‐(IV) sowie ein (strukturell nicht näher untersuchtes) Bisepoxid (V); bei der Bestrahlung von (II), (III) oder (IV) werden jeweils 3 ‐ in Lösung recht stabile ‐ Oxaannulene (VIa), (VIb), (VII) gebildet, deren Konfigurationen eingehend untersucht werden (1H‐NMR‐Spektren).
G. SCHROEDER, G. PLINKE, J. F. M. OTH
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ChemInform Abstract: ANNULENE 16. MITT. OXA(17)ANNULENE

Chemischer Informationsdienst, 1972
AbstractBei der Epoxidierung des Cyclooctatetraens (I) entstehen neben Bisepoxiden die Epoxide (II)‐(IV).
GERHARD SCHROEDER, GUENTER PLINKE, JEAN F. M. OTH   +2 more
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Aromatic Dicupra[10]annulenes

Journal of the American Chemical Society, 2015
Metal-containing aromatic systems (metalla-aromatics) are unique and important both experimentally and theoretically. Among metalla-aromatics, six-membered metallabenzenes and metallabenzynes have attracted much attention in recent years. However, reports on their superior homologues are rare.
Junnian, Wei, Yongliang, Zhang, Yue, Chi, Liang, Liu, Wen-Xiong, Zhang, Zhenfeng, Xi   +5 more
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The [13]Annulene Cation Is a Stable Möbius Annulene Cation

Organic Letters, 2010
The isomers of the [n]annulene cation series (n = 13, 17, and 21) were systematically scrutinized by DFT, SCS-MP2, and coupled-cluster methods. Only in the case of the [13]annulene cation the global minimum is clearly a Mobius structure. According to our theoretical predictions, the [13]annulene cation should also be kinetically stable.
Eva-Katrin, Mucke, Felix, Köhler, Rainer, Herges   +2 more
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ChemInform Abstract: ANNULENE 17. MITT. AZA(17)ANNULENE

Chemischer Informationsdienst, 1972
AbstractDie Reaktion des Cyclooctatetraens (I) mit dem Nitren (II) (aus N‐p‐Nitro‐benzolsulfonyloxy‐urethan und Triäthylamin) liefert unter anderem die Addukte (III)‐(V).
GERHARD SCHROEDER, GUENTER HEIL, HERBERT ROETTELE, JEAN F. M. OTH   +3 more
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1,4;8,11-Bisimino-[14]annulen

Tetrahedron Letters, 1975
AbstractDie Darstellung der 1,4;8,11‐Bisimino[14]annulene 2 wird beschrieben. Anhand einer einfachen MO‐Betrachtung werden die Eigenschaften der Verbindungen diskutiert und mit denen der 10b,10c‐Diazadicyclopenta[ef,kl]heptalene 1 verglichen.
Wilhelm Flitsch, Hermann Peeters
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