Results 21 to 30 of about 25,797 (319)

(Sila)Difluoromethylation of Fluorenyllithium with CF3H and CF3TMS

open access: yesSynOpen, 2018
Difluoromethylation of the C9-H site of the fluorene ring using lithium base and fluoroform (CF3H), which is one of the most cost-effective difluoromethylating reagents, is attained to give difluoromethylated fluorenes with an all-carbon quaternary ...
Kenichi Maruyama   +2 more
doaj   +1 more source

Exposition de la faune ichthyenne et autres animaux aquatiques aux polluants organiques, chimiques et biologiques dans le lac Nokoué au Sud du Bénin: Synthèse documentaire

open access: yesRevue Marocaine des Sciences Agronomiques et Vétérinaires, 2023
Le lac Nokoué (Sud Bénin) est la pêcherie continentale la plus productive de l’Afrique de l’Ouest avec une très forte biodiversité, mais qui malheureusement il perd progressivement ses ressources à cause de sa pollution.
Prudencio AGBOHESSI   +3 more
doaj   +1 more source

Unraveling the Coulombic Forces in Electronically Decoupled Bichromophoric Systems during Two Successive Electron Transfers [PDF]

open access: yes, 2017
Coulombic forces are vital in modulating the electron transfer dynamics in both synthetic and biological polychromophoric assemblies, yet quantitative studies of the impact of such forces are rare, as it is difficult to disentangle electrostatic forces ...
Ivanov, Maxim V.   +3 more
core   +2 more sources

The influence of spin-labeled fluorene compounds on the assembly and toxicity of the aβ peptide. [PDF]

open access: yesPLoS ONE, 2012
The deposition and oligomerization of amyloid β (Aβ) peptide plays a key role in the pathogenesis of Alzheimer's disease (AD). Aβ peptide arises from cleavage of the membrane-associated domain of the amyloid precursor protein (APP) by β and γ secretases.
Jitka Petrlova   +11 more
doaj   +1 more source

Molecular Actuators in Action: Electron-Transfer-Induced Conformation Transformation in Cofacially Arrayed Polyfluorenes [PDF]

open access: yes, 2018
There is much current interest in the design of molecular actuators, which undergo reversible, controlled motion in response to an external stimulus (light, heat, oxidation, etc.).
Cai, Sheng   +7 more
core   +3 more sources

Spreading Electron Density Thin: Increasing the Chromophore Size in Polyaromatic Wires Decreases Interchromophoric Electronic Coupling [PDF]

open access: yes, 2018
The development of novel polychromophoric materials using extended polycyclic aromatic hydrocarbons as a single large chromophore holds promise for long-range charge-transfer applications in photovoltaic devices and molecular electronics.
Hossain, Mohammad Mosharraf   +4 more
core   +4 more sources

A facile synthesis of novel indole derivatives as potential antitubercular agents

open access: yesJournal of Taibah University for Science, 2017
A novel series of 5,5-dimethyl-11-phenyl-4b,5,5a,10,10a,11,11a,12-octahydro-10,11,12-triaza-indeno[2,1-b]fluorenes 3a–3l were prepared by reacting oxindole, aryl amines and acetone using dibutylamine as an organocatalyst via simultaneous Knoevenagel ...
Gulzar A. Khan   +5 more
doaj   +1 more source

Cyanomethylation of Substituted Fluorenes and Oxindoles with Alkyl Nitriles.

open access: yesOrganic Letters, 2020
The first example of metal-free cyanomethylenation from alkyl nitriles of sp3 C-H bonds to afford quaternary carbon centers is described. This oxidative protocol is operationally simple and features good functional group compatibility.
Gang Hong   +2 more
semanticscholar   +1 more source

Gold(I)-Catalyzed Cycloisomerizations and Alkoxycyclizations of ortho-(Alkynyl)styrenes [PDF]

open access: yes, 2014
Indenes and related polycyclic structures have been efficiently synthesized by gold(I)-catalyzed cycloisomerizations of appropriate ortho-(alkynyl)styrenes.
Fernández Rodríguez, Manuel A.   +6 more
core   +1 more source

3,9′-Bi(9H-fluorene) [PDF]

open access: yesActa Crystallographica Section E Structure Reports Online, 2012
THE TITLE COMPOUND [SYSTEMATIC NAME: 9-(9H-fluoren-3-yl)-9H-fluorene], C(26)H(18), was obtained unintentionally as the product of the synthesis of a compound based on fluorene-thio-phene units. The two fluorene rings are connected through C atoms in the 3- and 9'-positions, and the dihedral angle between the mean planes of the two fluorene units is 78 ...
Liu, Jie, Yu, Wentao
openaire   +2 more sources

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