Results 61 to 70 of about 36,445 (329)

Distinctive Doping Behavior of Conjugated Polymers With Pendant‐Side Conjugation for Enhanced Thermoelectric Properties

open access: yesAdvanced Functional Materials, EarlyView.
Novel conjugated polymers with side‐chain π‐conjugation are developed to enhance organic thermoelectric properties. Remarkably, the pendant doping in the conjugated polymers preserved strong intermolecular ordering in the film states even at high FeCl3 dopant concentrations (16 – 32 mM), achieving a promising power factor > 10 µW m−1 K−2 across a wide ...
Hyeokjun Kim   +4 more
wiley   +1 more source

Recent Advances in the Synthesis of Thiophene Derivatives by Cyclization of Functionalized Alkynes

open access: yesMolecules, 2014
This review is intended to highlight some recent and particularly interesting examples of the synthesis of thiophene derivatives by heterocyclization of readily available S-containing alkyne substrates.
Raffaella Mancuso, Bartolo Gabriele
doaj   +1 more source

Molecular diradicals [PDF]

open access: yes, 2019
Resumen de la comunicaciónDiradicals are defined as molecules with two unpaired electrons which define distinctive manifolds of singlet and triplet states.
Casado-Cordon, Juan
core  

Synthesis of Fused Furans and Thiophenes via Ruthenium-Catalyzed Atom-Transfer [2+2+1] Cycloadditions of α,ω-Diynes [PDF]

open access: yes, 2017
Furans and thiophenes are important five-membered heterocyclic compounds that are found in natural products, functional materials, and pharmaceutics. This account outlines our studies on ruthenium-catalyzed atom-transfer [2+2+1] cycloadditions toward the
73610, Yamamoto, Yoshihiko
core   +1 more source

Over 18% Efficiency from Halogen‐Free Solvent‐Processed Polymer Solar Cells Enabled by Asymmetric Small Molecule Acceptors with Fluoro‐Thienyl Extended Terminal

open access: yesAdvanced Functional Materials, EarlyView.
An asymmetric non‐fullerene acceptor BTP‐FT is developed by extending the end group of Y6‐BO with thiophene. The conformation of the molecule is determined by the noncovalent F···S interaction as demonstrated by 2D NMR and simulations. An efficiency of 18.39% is achieved in the resulting ternary solar cells processed from toluene.
Jingnan Wu   +14 more
wiley   +1 more source

Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts

open access: yesMolecules, 2010
In this manuscript, we report clear evidence for the generation of aromatic cation radicals produced by using [hydroxy(tosyloxy)iodo]benzene (HTIB) in fluoroalcohol solvents such as 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)
Toshifumi Dohi   +5 more
doaj   +1 more source

Influence of solvent and substituents on the reaction of N-alkylthioacetamides with dimethyl acetylenedicarboxylate: Synthesis of functionalized thiophenes containing an exocyclic double bond [PDF]

open access: yes, 2013
The reaction of thioacetamides with dimethyl acetylenedicarboxylate affords 3-oxothien-2-ylidene or 4-oxothiazol-2,5-ylidene derivatives based on the structure of the thioacetamides and the solvent employed.
Klimareva, E. L.   +4 more
core   +1 more source

Rigid Fluorescent Indacenetetraone‐Based Semiconducting Polymers via Knoevenagel Condensation

open access: yesAdvanced Functional Materials, EarlyView.
New donor–acceptor polymers prepared by Knoevenagel condensation of indacenedithiophene‐ and indacenedifuran‐based aldehydes reveal an exceptionally rigid backbone, which is manifested in the remarkably narrow absorption and emission bands in red to near‐infrared region.
So‐Huei Kang   +7 more
wiley   +1 more source

Rh(II)-mediated domino [4 + 1]-annulation of α-cyanothioacetamides using diazoesters: A new entry for the synthesis of multisubstituted thiophenes

open access: yesBeilstein Journal of Organic Chemistry, 2017
A new approach towards the synthesis of multisubstituted thiophenes is elaborated based on Rh(II)-catalyzed domino reactions of acyclic diazoesters with α-cyanothioacetamides.
Jury J. Medvedev   +5 more
doaj   +1 more source

Organocatalytic enantioselective dearomatization of thiophenes by 1,10-conjugate addition of indole imine methides

open access: yesNature Communications, 2021
Catalytic asymmetric dearomatization is a powerful tool for the rapid construction of diverse chiral cyclic molecules from cheap and easily available arenes.
Xingguang Li   +4 more
doaj   +1 more source

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