Results 161 to 170 of about 2,216 (186)
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Antiaromatic Metallacyclopentatriene Complexes
Journal of the American Chemical SocietyThere 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 +5 more
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Releasing Antiaromaticity in Metal-Bridgehead Naphthalene
Journal of the American Chemical Society, 2021As 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 +7 more
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Dibenzoberylloles: antiaromatic s-block fluorene analogues
Chemical Communications, 2023The first Lewis-base-stabilised dibenzoberylloles are prepared, one of which undergoes a complex but selective thermal conversion to a loosely bound beryllium-alkene π complex and two-electron reduction to an aromatic dianion.
Tobias Tröster +5 more
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Angewandte Chemie International Edition in English, 1968
AbstractAccording to quantum mechanical calculations, systems with 4n π electrons ought to have anti‐aromatic character, i.e. be destabilized by resonance. This prediction is examined for the case of cyclopropenyl anion, the simplest system having 4n π electrons (n = 1).
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AbstractAccording to quantum mechanical calculations, systems with 4n π electrons ought to have anti‐aromatic character, i.e. be destabilized by resonance. This prediction is examined for the case of cyclopropenyl anion, the simplest system having 4n π electrons (n = 1).
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Diazadioxa[8]circulenes: Planar Antiaromatic Cyclooctatetraenes
Chemistry – A European Journal, 2013AbstractIn this paper we describe a new class of antiaromatic planar cyclooctatetraenes: the diazadioxa[8]circulenes. The synthesis was achieved by means of a new acid‐mediated oxidative dimerization of 3,6‐dihydroxycarbazoles to yield the diazadioxa[8]circulenes in high yields.
Hensel, Thomas +11 more
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The antiaromaticity of cyclobutadiene
Tetrahedron, 1976Abstract The antiaromaticity of cyclobutadiene systems is explored by means of theoretical studies on quinone electrochemical oxidation reactions.
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Isophlorinoids: The Antiaromatic Congeners of Porphyrinoids
Chemical Reviews, 2016Ever since the discovery of the porphyrin ring in "pigments of life", such as chlorophyll and hemoglobin, it has become a prime synthetic target for optoelectronic properties and in the design of metal complexes. During one such early expedition on the synthesis of porphyrin, Woodward proposed that condensing pyrrole with an aldehyde under acidic ...
B. Kiran Reddy +3 more
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Antiaromaticity in Monocyclic Conjugated Carbon Rings
Chemical Reviews, 20011326 10. Summary 1327 11. Triplet States 1327 12. Origin of Aromaticity and Antiaromaticity 1328 13.
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Chemists make antiaromatic nanocage
C&EN Global Enterprise, 2019What Jonathan Nitschke of the University of Cambridge and colleagues made shouldn’t be stable. But it is. After 2 years of work by postdoc Masahiro Yamashina, now at the Tokyo Institute of Technology, the team reports a nanosized cage with antiaromatic walls that boasts some peculiar magnetic properties (Nature 2019, DOI: 10.1038/s41586-019-1661-x). To
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Fused Aromatic and Antiaromatic Smaragdyrin Dimers
Angewandte ChemieAbstractSingly‐linked aromatic [22]smaragdyrin BF2 complex dimer was synthesized by the reductive coupling of 16‐brominated [22]smaragdyrin BF2 complex, which was oxidized to a stable diradical with PbO2. As the first example of fused smaragdyrin dimer, a fused [22]smaragdyrin BF2 complex dimer was synthesized by the oxidation of a CuCl‐BF2 complex ...
Yang Liu +8 more
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