Results 11 to 20 of about 1,579 (190)
Stacked antiaromatic porphyrins [PDF]
Nature Communications, 2016 It has been proposed that stacking antiaromatic molecules can build three-dimensional aromaticity, but this claim has lacked experimental validation.
Ryo Nozawa +10 more
doaj +3 more sources
“The Great Escape” from Antiaromaticity: Reduction of Strained Pyrenes
, 2016 The two-electron reduction of strained pyrenes ([7](2,7)pyrenophanes) with lithium metal leads to the formation of a new σ-bond as a means to “escape” strained ...
Ivan Aprahamian (1336620) +7 more
core +11 more sources
, 2023 The literature reports numerous conjugated molecules that are claimed to be antiaromatic because of a formal 4n π-electron system. However, this neglects the actual local aromaticity of the molecules, which often feature multiple subunits with [4n+2] π ...
Glöcklhofer, Florian; orcid:
core +4 more sources
Localized Antiaromaticity Hot-spot Drives Reductive Dehydrogenative Cyclizations in Bis- and Mono-Helicenes [PDF]
, 2022 We describe reductive dehydrogenative cyclizations that form hepta-, nona- and decacyclic anionic graphene subunits from mono- and bis-helicenes with an embedded five-membered ring.
Marina, Petrukhina +9 more
core +1 more source
On the antiaromatic–aromatic–antiaromatic transition of the stacked cyclobutadiene dimer
Physical Chemistry Chemical Physics, 2023 We have studied the changes in the aromatic nature of two cyclobutadiene (C 4 H 4 ) molecules on decreasing the intermolecular distance and approaching the cubane structure in a face-to-face fashion.
Mesías Orozco-Ic, Dage Sundholm
openaire +3 more sources
Global Aromaticity and Antiaromaticity in Porphyrin Nanoring Anions [PDF]
, 2019 Doping, through oxidation or reduction, is often used to modify the properties of π-conjugated oligomers. In most cases, the resulting charge distribution is difficult to determine.
Timothy, D. W. Claridge +3 more
core +4 more sources
Thiophene-Fused Ladder Boroles with High Antiaromaticity
, 2016 A series of polycyclic thiophene-fused boroles were synthesized on the basis of stepwise substitution reactions from thienylboronic ester precursors. In these ladder-type π-conjugated systems, the thiophene-fused structure enhances the antiaromaticity of
Azusa Iida (2100184) +1 more
core +5 more sources
Angew Chem Int Ed EnglA strained macrocycle consisting solely of azulene subunits, named [6]cycloparaazulenylene ([6]CPA), is presented. The macrocycle exhibits a notably narrow HOMO–LUMO gap for a pristine azulene species, strain‐induced red‐shifted absorption, and an unusual tubular packing motif elucidated via single‐crystal XRD.
Douglas C +8 more
europepmc +2 more sources
Barrier-Lowering Effects of Baird Antiaromaticity in Photoinduced Proton-Coupled Electron Transfer (PCET) Reactions [PDF]
, 2021 Baird antiaromaticity plays a central role in the photochemistry of proton-coupled electron transfer (PCET) reactions. We recognize that many popular organic chromophores that catalyze photoinduced PCET reactions are Hückel aromatic in the ground state ...
Judy, Wu, Lucas, Karas, Chia-Hua, Wu
core +2 more sources
Norcorrole as a Delocalized, Antiaromatic System [PDF]
Scientific Reports, 2019 AbstractNickel norcorrole provides an unusual example of a molecule that is strongly antiaromatic according to the magnetic criterion, but which exhibits, according to high-quality DFT calculations, a symmetric, delocalized structure with no difference in bond length between adjacent Cmeso-Cα bonds.
Jeanet Conradie +2 more
+8 more sources