Results 151 to 160 of about 2,231 (184)

Assembly of Pyrenes through a Quadruple Photochemical Cascade: Blocking Groups Allow Diversion from the Double Mallory Path to Photocyclization at the Bay Region. [PDF]

J Am Chem Soc
Dos Santos NR, Schober JV, Laconsay CJ, Palazzo AM, Kuhn L, Chu A, Hanks B, Hanson K, Wu J, Alabugin IV.   +9 more
europepmc   +1 more source

An 18-Porphyrin Nanoring at the Size Limit for Global Aromaticity. [PDF]

J Am Chem Soc
Holmes JM, Gotfredsen H, Gödde L, Hergenhahn J, Rani K, Yamada KE, Deng JR, Warwick L, Clarke M, Edmondson M, O'Shea JN, Saywell A, Anderson HL.   +12 more
europepmc   +1 more source

The forgotten borole: synthesis, properties and reactivity of a 1-boraindene. [PDF]

Chem Sci
Wieprecht N, Krummenacher I, Wüst L, Michel M, Fuchs S, Nees S, Härterich M, Braunschweig H.   +7 more
europepmc   +1 more source

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Polycyclic antiaromatic hydrocarbons

Physical Chemistry Chemical Physics, 2008
Magnetically induced current densities have been calculated for a series of hydrocarbons consisting of hexadehydro[12]annulene rings alternatingly fused with benzenes. The calculations show that all molecular rings of the studied molecules sustain paramagnetic ring currents.
Jonas, Jusélius, Dage, Sundholm
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All-Metal Aromaticity and Antiaromaticity

Chemical Reviews, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Alexander I, Boldyrev, Lai-Sheng, Wang
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Synthesis of antiaromatic tetrabenzodithiaamethyrin

Journal of Porphyrins and Phthalocyanines, 2021
Bicyclo[2.2.2]octadiene(BCOD)-fused dithiaamethyrin 4 was synthesized via a “3+3” condensation method. Thermal conversion of the BCOD moieties afforded tetrabenzodithiaamethyrin 5. The highly planar structures of 4 and 5 were confirmed by X-ray diffraction studies. The 1H NMR, absorption and MCD spectra, together with TD-DFT calculations revealed that
Tetsuo Okujima, Ryohei Kozumi, Shigeki Mori, Yoshiaki Chino, Masayoshi Takase, Hidemitsu Uno, Nagao Kobayashi   +6 more
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Is antiaromaticity absolute?

Journal of the American Chemical Society, 1978
The concept of antiaromaticity as applied to 4n-ir electron monocyclic conjugated systems is examined and two sub­ types distinguished. Relative antiaromaticity is the term which describes cyclic systems which are less stable than acyclic con­ jugated analogues.
Nathan L. Bauld, Terry L. Welsher, James Cessac, Robert L. Holloway   +3 more
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Antiaromatic 1,5‐Diaza‐s‐indacenes

Angewandte Chemie International Edition, 2021
Abstracts‐Indacene is a classical non‐alternant hydrocarbon that contains 12 π‐electrons in a cyclic π‐conjugation system. Herein, we report its nitrogen‐doped analogue, 1,5‐diaza‐s‐indacene. 1,5‐Diaza‐s‐indacenes were readily prepared from commercially available 2,5‐dichlorobenzene‐1,4‐diamine through a two‐step transformation consisting of a ...
Kensuke Hanida, Jinseok Kim, Norihito Fukui, Yusuke Tsutsui, Shu Seki, Dongho Kim, Hiroshi Shinokubo   +6 more
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Antiaromatic Metallacyclopentatriene Complexes

Journal of the American Chemical Society
There is no report on the (anti)aromaticity of metallacyclopentatrienes, one kind of common and important five-membered metallacycles. This work presents the novel synthesis of osmium cis-biscarbene complexes and their oxidation to osmacyclopentatrienes. The osmacyclopentatriene unit is antiaromatic, as revealed by experimental and theoretical studies.
Bingjie Fu, Yarong Wang, Yue Zhao, Yang Li, Wenfeng Jiang, Wei Bai   +5 more
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Releasing Antiaromaticity in Metal-Bridgehead Naphthalene

Journal of the American Chemical Society, 2021
As a fundamental chemical property, aromaticity guides the synthesis of novel structures and materials. Replacing the carbon moieties of aromatic hydrocarbons with transition metal fragments is a promising strategy to synthesize intriguing organometallic counterparts with a similar aromaticity to their organic parents.
Chun Tang, Yu Zhao, Jingjing Wu, Zhixin Chen, Liu Leo Liu, Yuan-Zhi Tan, Jun Zhu, Haiping Xia   +7 more
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