Results 121 to 130 of about 618 (167)
Three wrongs make a right: a computational investigation of [4<i>n</i>]-[4<i>n</i>]-[4<i>n</i>] fused π-systems. [PDF]
Chem SciKhan MUG +3 more
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Aromaticity and Antiaromaticity in Zintl Clusters
Chemistry - A European Journal, 2018 AbstractOriginally, the concepts of aromaticity and antiaromaticity were introduced to explain the stability and reactivity of unsaturated organic compounds. Since then, they have been extended to other species with delocalized electrons including various saturated systems, organometallic compounds, and even inorganic clusters and molecules.
Zhongfang Chen +2 more
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All-Metal Aromaticity and Antiaromaticity
Chemical Reviews, 2005AbstractFor Abstract see ChemInform Abstract in Full Text.
Alexander Boldyrev +2 more
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Polycyclic antiaromatic hydrocarbons
Physical Chemistry Chemical Physics, 2008Magnetically 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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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 +3 more
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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 +3 more
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Aromatic and Antiaromatic Dehydroannulenes
Journal of the American Chemical SocietyCyclocarbons make up an emerging family of carbon allotropes, but their instability precludes the study of their physicochemical properties. We report a synthetic route to cyclopentenone-annulated [18]- and [24]dehydroannulenes that are stable aromatic and antiaromatic models of cyclocarbon precursors. Combining NMR spectroscopy, X-ray crystallography,
Yann Lie +2 more
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Synthesis of antiaromatic tetrabenzodithiaamethyrin
Journal of Porphyrins and Phthalocyanines, 2021Bicyclo[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 +6 more
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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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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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