Results 31 to 40 of about 1,579 (190)
An antiaromatic-walled nanospace
Nature, 2019 Over the past few decades, several molecular cages, hosts and nanoporous materials enclosing nanometre-sized cavities have been reported1-5, including coordination-driven nanocages6. Such nanocages have found widespread use in molecular recognition, separation, stabilization and the promotion of unusual chemical reactions, among other applications3-10.
Yamashina, Masahiro +5 more
openaire +6 more sources
Chemical Switching Between B2N and B2C Homoaromaticity
Angewandte Chemie, EarlyView.We report the synthesis of homoaromatic 1‐aza‐2,4‐diazadiboretane with a bicyclic four‐membered NB2C motif and demonstrate experimentally and theoretically that the homoaromatic delocalization can also be chemically shifted from the B2N to the B2C moiety by deprotonation of the ring carbon atom.
Tim Wiesmeier +5 more
wiley +2 more sources
Aromaticity of Heterocirculenes
Chemistry, 2021 This review summarizes the results on the aromaticity of a series of synthesized and hypothetical neutral heterocirculene molecules and their double charged ions.
Nataliya N. Karaush-Karmazin +2 more
doaj +1 more source
How DNA Base Pairs Escape From the Excited-State: Antiaromaticity Relief in the Picoseconds [PDF]
, 2019 Before the development of an ozone layer in the Archean atmosphere, the flux of UV radiation reaching Earth was suggested to be several orders of magnitude higher than it is today. For the emerging biomolecules, constant exposure to strong UV irradiation
Judy, Wu +3 more
core +1 more source
1,2‐Bis(boronate) Arenes by Borylation Directed Borylation
Angewandte Chemie, EarlyView.Boron electrophiles derived from tetrabromo‐pyrazaboles and AlCl3 affect the regioselective vicinal double C–H borylation of a range of arenes and polycyclic aromatic hydrocarbons (PAHs). A subsequent pinacol installation step then affords the vicinal bis‐boronate ester‐substituted arene/PAH.
Anna V. Schellbach +4 more
wiley +2 more sources
Aromatic, or Antiaromatic, That Is the Question: [PDF]
, 2021 The term aromaticity in chemistry is reminiscent of symmetric, stable structures that have delocalized electrons and sustain diamagnetic ring currents in the presence of external magnetic fields. The two latter characteristics sometimes mistakenly are thought to be the same.
Ben Joseph R Cuyacot +1 more
openaire +1 more source
Magnetic Antiaromaticity─Paratropicity─Does Not Necessarily Imply Instability [PDF]
, 2023 Magnetically induced ring currents are a conventional tool for the characterization of aromaticity. Dia- and paratropic currents are thought to be associated with stabilization (aromaticity) and destabilization (antiaromaticity), respectively.
Foroutan-Nejad, Cina
core +1 more source
Dihydrogen Activation by Antiaromatic Pentaarylboroles [PDF]
Journal of the American Chemical Society, 2010 Facile metal-free splitting of molecular hydrogen (H(2)) is crucial for the utilization of H(2) without the need for toxic transition-metal-based catalysts. Frustrated Lewis pairs (FLPs) are a new class of hydrogen activators wherein interactions with both a Lewis acid and a Lewis base heterolytically disrupt the hydrogen-hydrogen bond.
Fan, Cheng +4 more
openaire +3 more sources
Computational Study of the Effect of π-Congestion on the Singlet Biradical Character and Stacked Antiaromaticity in Acene Dimers [PDF]
, 2022 We demonstrated the computational study of the π-congestion effects in benzene, naphthalane, anthracene, teteracene, and pentacene dimers close with two positions at Ca···Ca’ and Cb···Cb’ to elucidate the singlet biradical characters as well as the ...
Yuta, Makihara +3 more
core +2 more sources
Nucleus-independent chemical shift profiles along the intrinsic distortion path for Jahn-Teller active molecules. Study on cyclopentadienyl radical and cobaltocene [PDF]
Journal of the Serbian Chemical Society, 2015 The aromatic/antiaromatic behavior of the cyclopentadienyl anion (Cp-), bis(η5-cyclopentadienyl)iron(II) (Fe(Cp)2), as well as of the Jahn-Teller (JT) active cyclopentadienyl radical (Cp∙) and bis(η5-cyclopentadienyl)cobalt(II) (Co(Cp)2) has ...
Anđelković Ljubica +3 more
doaj +1 more source