Results 231 to 240 of about 11,071 (289)

Flexible Routes to Thiophenes

Organic Letters, 2013
Three convergent routes to thiophenes are described, hinging on the radical addition of α-xanthyl ketones to ethyl vinyl sulfide or to vinyl pivalate. The latter route ultimately proved to be the most versatile and efficient (61-94%).
Jullien, Hélène, Quiclet-Sire, Béatrice, Tétart, Thomas, Zard, Samir, Z.   +3 more
openaire   +4 more sources

Thiophenes

, 2014
The chemoselective synthesis of indeno[1,2-b]thiophenes was developed through the annulation of α-enolic dithioesters with ninhydrin under solvent-free conditions.
Ganesh Chandra Nandi, Maya Shankar Singh, Koley, Suvajit, Chowdhury, Sushobhan, Ramulu, B. Janaki, Suvajit Koley, Sushobhan Chowdhury, B. Janaki Ramulu, Tanmoy Chanda, Chanda, Tanmoy, Nandi, Ganesh Chandra, Singh, Maya Shankar   +11 more
openaire   +2 more sources

Room-Temperature Direct β-Arylation of Thiophenes and Benzo[b]thiophenes and Kinetic Evidence for a Heck-type Pathway [PDF]

Journal of the American Chemical Society, 2016
The first example of a regioselective β-arylation of benzo[b]thiophenes and thiophenes at room temperature with aryl iodides as coupling partners is reported.
Chiara Colletto, FRANCISCO Juliá-Hernández, Igor Larrosa   +2 more
exaly   +2 more sources

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Redox chemistry of thiophene, pyrrole and thiophene-pyrrole-thiophene oligomers

Synthetic Metals, 1999
Abstract Electrochemical properties of oligopyrroles and thiophene-pyrrole-thiophene oligomers, which are key-step intermediates in electropolymerization processes, have been investigated by means of fast electrochemistry, flash photolysis and pulse radiolysis techniques.
P. Audebert, J.-M Catel, V. Duchenet, L. Guyard, P. Hapiot, G. Le Coustumer   +5 more
openaire   +1 more source

Double photoionization of thiophene and bromine-substituted thiophenes

The Journal of Chemical Physics, 2008
We report the double photoionization spectra of thiophene, 3-bromothiophene, and 3,4-dibromothiophene using a coincidence spectroscopy technique based on electron time-of-flight measurements. Spectra have been recorded between the onset and 40.814 eV using He IIα radiation. The He I photoelectron spectrum of 3,4-dibromothiophene has also been measured.
P. Linusson, STORCHI, LORIANO, F. Hejkenskjoeld, E. Andersson, M. Elshakre, B. Pfeifer, M. Colombet, J. H. D. Eland, L. Karlsson, J. E. Rubensson, TARANTELLI, Francesco, R. Feifel   +11 more
openaire   +3 more sources

Thiophenes, Thiophene 1,1‐Dioxides, and Thiophene 1‐Oxides

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +1 more source

Direct Vicinal Difunctionalization of Thiophenes Enabled by the Palladium/Norbornene Cooperative Catalysis

Journal of the American Chemical Society, 2019
Herein we report a direct vicinal difunctionalization of thiophenes via the palladium/norbornene (Pd/NBE) cooperative catalysis. A series of mono- and disubstituted thiophenes can be difunctionalized site-selectively and regioselectively at the C4 and C5
Renhe Li, Guangbin Dong
exaly   +2 more sources

A new synthesis of benzo[b]thiophenes and benzo[c]thiophenes by annulation of disubstituted thiophenes

The Journal of Organic Chemistry, 1986
Annelation de R-3 thiophenecarbaldehyde-2, -carboxylate-2 de methyle et -carbonitrile-2 et de R-4 thiophenecarboxylate-3 de methyle et -carbonitrile-3 avec des accepteurs de Michael: obtention de benzo [b] thiophenes disubstitues-5,6 et de leurs derives amino ou hydroxy-7 et d'amino- ou hydroxy-4 benzo [c] thiophenes disubstitues-5 ...
TERPSTRA, JW, van Leusen, A.M.
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Electrophilic phenylselenenylation of thiophenes. Synthesis of poly(phenylseleno)thiophenes.

Tetrahedron, 1994
Abstract The phenylselenenyl sulfate, generated from the oxidation of diphenyl diselenide with ammonium persulfate, easily effects electrophilic aromatic substitution reactions on thiophene, 2- and 3-methylthiophenes and on 3-bromothiophene. The phenylseleno group activates the substrate to further substitution.
TIECCO, Marcello, TESTAFERRI, Lorenzo, TINGOLI M, MARINI, Francesca, MARIGGIO S.   +4 more
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Electrophilic substitution on the thiophen ring. Part I. Bromination of thiophen and deuteriated thiophen

Journal of the Chemical Society B: Physical Organic, 1970
A study of salt effects and activation parameters indicates that the mechanism of bromination of thiophen in aqueous acetic acid is the same as that of benzene compounds. There is an isotope effect (kH/kD) of 1·3, which is shown to be secondary and does not represent slow proton loss.
Anthony R. Butler, James B. Hendry
openaire   +1 more source