Results 11 to 20 of about 18,813 (295)

Iridium-Catalyzed Silylation of Five-Membered Heteroarenes: High Sterically Derived Selectivity from a Pyridyl-Imidazoline Ligand. [PDF]

, 2020
The steric effects of substituents on five-membered rings are less pronounced than those on six-membered rings because of the difference in bond angles. Thus, the regioselectivities of reactions of five-membered heteroarenes that occur with selectivities
Hartwig, John F, Karmel, Caleb, Kharitonova, Elena V, Rubel, Camille Z   +3 more
core   +1 more source

Electronic Correlations in Oligo-acene and -thiophene Organic Molecular Crystals [PDF]

, 2004
From first principles calculations we determine the Coulomb interaction between two holes on oligo-acene and -thiophene molecules in a crystal, as a function of the oligomer length.
Alberto F. Morpurgo, E. A. Silinsh, Geert Brocks, J. van den Brink, Jeroen van den Brink, M. J.  S. Dewar, R. W. G. Wyckoff   +6 more
core   +5 more sources

Synthesis of Some Thienopyrimidine Derivatives

Molecules, 2006
Thioxothienopyrimidinones, alkylthio- and arylalkylthiothienopyrimidinones, thienopyrimidinones, thienopyrimidines a thienopyrimidinedione and a thienotriazolo- pyrimidinone were prepared from 2-amino-3-carboethoxy-4,5-disubstituted thiophenes and 2 ...
Hassan M. Al-Hazimi, Hanan A. S. Al-Blowy, Fatma E. M. El-Baih   +2 more
doaj   +1 more source

Synthesis and Anti‐Inflammatory Activity of 2‐Amino‐4,5,6,7‐tetrahydrobenzo[b]thiophene‐Derived NRF2 Activators

ChemistryOpen, 2022
This is the first study investigating the nuclear factor (erythroid‐derived 2)‐like 2 (NRF2) activity of compounds containing a new scaffold, tetrahydrobenzo[b]thiophene.
Kit‐Kay Mak, Zhang Shiming, Dr. Ola Epemolu, Prof. Dr. Albena T. Dinkova‐Kostova, Dr. Geoffrey Wells, Dr. Irina G. Gazaryan, Dr. Raghavendra Sakirolla, Prof. Dr. Zulkefeli Mohd, Prof. Dr. Mallikarjuna Rao Pichika   +8 more
doaj   +1 more source

Light absorption spectra in oligothiophene molecules [PDF]

, 2017
Para el dictado de clases, se pueden utilizar diferentes herramientas que nos brindan las nuevas tecnologías; herramientas que nos están modificando los procesos de enseñanza-aprendizaje.
Gala, Fabrizio, Zollo, Giuseppe
core   +4 more sources

The preparation of ketene dithioacetals and thiophenes from chloropyridines containing an active methylene group [PDF]

, 2010
The base catalysed reaction of carbon disulphide with the active methylene groups of chloropyridines 4 and 7, followed by alkylation with reagents which also contain active methylene groups, lead to ketene dithioacetals.
Bremner, David H., Sturrock, Keith R., Wishart, Grant   +2 more
core   +3 more sources

Carbon−Phosphorus Bond Activation of Tri(2-thienyl)phosphine at Dirhenium and Dimanganese Centers [PDF]

, 2009
Reaction of [Re2(CO)9(NCMe)] with tri(2-thienyl)phosphine (PTh3) in refluxing cyclohexane affords three substituted dirhenium complexes: [Re2(CO)9(PTh3)] (1), [Re2(CO)8(NCMe)(PTh3)] (2), and [Re2(CO)8(PTh3)2] (3).
Begum, Noorjahan, Bennett, Dennis W., Ghosh, Shishir, Haworth, Daniel T., Hogarth, Graeme, Kabir, Shariff E., Lindeman, Sergey V., Lund University., Mottalib, Abdul,, Nordlander, Ebbe, Raha, Arun K., Siddiquee, Tasneem A., Uddin, Md. Nazim   +12 more
core   +2 more sources

D-π-D chromophores based on dithieno[3,2-b:2′,3'-d]thiophene (DTT) : potential application in the fabrication of solar cell [PDF]

, 2016
In this work, four stable dithieno[3,2-b:2′,3'-d]thiophene-based π-extended molecules were designed and synthesized via a Pd-catalysed Sonogashira coupling reaction.
Akther, Tahmina, Akther, Thamina, Do, Jung-Hee, Elsegood, Mark, Elsegood, Mark R.J., Elsegood, Mark Ri, Feng, Xing, Horsburgh, Lynne, Redshaw, Carl, Wang, Chuan-Zeng, Xing, Feng, Yamato, Takehiko   +11 more
core   +2 more sources

Palladium-catalyzed 2,5-diheteroarylation of 2,5-dibromothiophene derivatives

Beilstein Journal of Organic Chemistry, 2014
Conditions allowing the one pot 2,5-diheteroarylation of 2,5-dibromothiophene derivatives in the presence of palladium catalysts are reported.
Fatma Belkessam, Aidene Mohand, Jean-François Soulé, Abdelhamid Elias, Henri Doucet   +4 more
doaj   +1 more source

Flavouring Group Evaluation 76 Revision 2 (FGE.76Rev2): Consideration of sulfur‐containing heterocyclic compounds, evaluated by JECFA, structurally related to thiazoles, thiophenes, thiazoline and thienyl derivatives from chemical group 29 and miscellaneous substances from chemical group 30 evaluated by EFSA in FGE.21Rev5

EFSA Journal, 2023
The Panel on Food Additives and Flavourings (FAF) was requested to consider the JECFA evaluations of 28 flavouring substances in the Flavouring Group Evaluation 76 (FGE.76Rev2). Twenty‐one of these substances have been considered in FGE.76Rev1.
EFSA Panel on Food Additives and Flavourings (FAF), Maged Younes, Gabriele Aquilina, Laurence Castle, Gisela Degen, Karl‐Heinz Engel, Paul J Fowler, Maria Jose Frutos Fernandez, Peter Fürst, Ursula Gundert‐Remy, Rainer Gürtler, Trine Husøy, Melania Manco, Peter Moldeus, Sabina Passamonti, Romina Shah, Ine Waalkens‐Berendsen, Matthew Wright, Romualdo Benigni, Claudia Bolognesi, Kevin Chipman, Eugenia Cordelli, Karin Nørby, Camilla Svendsen, Maria Carfí, Giorgia Vianello, Wim Mennes   +26 more
doaj   +1 more source