Results 171 to 180 of about 23,422 (216)

Annulenylenes, Annulynes, and Annulenes

Accounts of Chemical Research, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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ChemInform Abstract: THE SYNTHESIS OF BENZENE‐ANNELATED ANNULENES. DIBENZOTETRAKISDEHYDRO(18)ANNULENE, AND TRIBENZOBISDEHYDRO(14)ANNULENE

Chemischer Informationsdienst, 1977
AbstractDie Synthesen der Titelverbindungen (VIIIa), (VIIIb) bzw. (XI) werden durchgeführt, um den Einfluß der Anellierung von Benzolringen auf [4n + 2] Annulene zu untersuchen.
J. OJIMA, T. YOKOMACHI, A. KIMURA
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Bridged Annulenes

Israel Journal of Chemistry, 1980
AbstractThe synthesis and aromaticity of 1,6‐methano[10]annulene and its analogues containing a heteroatom bridge suggested the possibility that the homologous series of bridged [4n+ 2]annulenes1, 2, 3, etc., formally derived from the acene series, could be developed.
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Synthesis and properties of methano bridged tetradehydro-[18]annulene, -[20]annulene, -[22]annulene, -[24]annulene, and the related [1,3]cyclophanpolyenediyne compounds

Journal of the Chemical Society, Perkin Transactions 1, 1987
The title annulenes (4a–d) have been synthesized by a Wittig reaction of cyclohepta-1,3,5-triene-1,6-dicarbaldehyde (1a) or its vinylogous dialdehydes (1b–d) with 3-methylpent-2-en-4-ynyltriphenylphosphonium bromide (2), followed by intramolecular oxidative coupling of the resulting acyclic compounds.
J?ro Ojima, Emiko Ejiri, Tadahito Kato, Mitsunobu Nakamura, Shigeyasu Kuroda, Shuji Hirooka, Mitsuo Shibutani   +6 more
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Resonanzenergie überbrückter [10]Annulene

Angewandte Chemie, 1983
AbstractDas vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1983, 1379.
Wolfgang R. Roth, Manfred B�hm, Hans-Werner Lennartz, Emanuel Vogel   +3 more
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Classic Annulenes, Nonclassical Applications

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
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ChemInform Abstract: 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.

Chemischer Informationsdienst, 1986
AbstractFollowing the reaction sequence shown in the scheme, the title compounds (II), (VI), (VIII) (stable), (X), (XII) (relatively stable), (XIV) and (XVI) (unstable) are available.
J. OJIMA, T. NAKADA, E. EJIRI, M. NAKAMURA   +3 more
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ChemInform Abstract: ANNULENES, 28. SYNTHESIS OF FLUORO(18)ANNULENE AND 1,2‐DIHALO(18)ANNULENES AND ATTEMPTED SYNTHESIS OF 1,2‐DIAZA(16)ANNULENES

Chemischer Informationsdienst, 1978
AbstractAus dimerem Cyclooctatetraen (I) und den halogenierten Olefinen (II) entstehen als Hauptprodukte die Verbindungen (IIIa) bzw. (IIIb); aus (IIIa) ist mit Tributyl‐Sn‐hydrid das Derivat (IIIc) zugänglich.
R. NEUBERG, G. SCHROEDER, J. F. M. OTH
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Monosubstituierte [16] Annulene

Chemische Berichte, 1974
AbstractDie Synthesen von Methoxycarbonyl‐ (4a ⇌ 4a), Phenyl‐ (4b ⇌ 5b), Chlor‐(4c ⇌ 5c) und Fluor[16]annulenen (4d ⇌ 5d) werden beschrieben. Ihre temperaturabhängigen NMR‐ Spektren werden mitgeteilt und im Lichte des für [16] Annulen entwickelten Austauschmechanismus diskutiert.
Gerhard Schröder, Gerald Kirsch, Jean F. M. Oth   +2 more
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Aza[18]annulene

Angewandte Chemie, 1979
Das erste monocyclische Vinyloge des Pyridins mit (4n + 2) π‐Elektronen – also ein „aromatisches”︁ Aza[18]annulen – wurde in vielstufiger Synthese als schwarzgrüne Kristalle erhalten.
Walter Gilb, Gerhard Schröder
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