Results 21 to 30 of about 38,014 (298)

SYNTHESIS AND CHARACTERIZATION OF SUBSTITUTED GROUP CONTROLLED PYRENE DERIVATIVES WITH RADICAL CATIONS [PDF]

open access: yesQuímica Nova
Two novel alkyl thiophene-modified pyrene derivatives (1)-(2) were created and synthesized using palladium-catalyzed Stille coupling processes and Friedel-Crafts reaction of pyrene.
Shunjie Li, Jian Chen
doaj   +1 more source

New Approaches for the Synthesis of Heterocyclic Compounds Derived from Cyclohexan-1,3-dione with Anti-proliferative Activities

open access: yesActa Chimica Slovenica, 2021
In the present work a series of heterocyclization reactions were adopted using cyclohexan-1,3-dione through its reaction with either furan-2-carbaldehyde or thiophene-2-carbaldehyde to give the corresponding ylidene derivatives 3a,b. The latter compounds
Rafat Milad Mohareb   +2 more
doaj   +1 more source

Linear and nonlinear luminescence properties of thiophene based materials [PDF]

open access: yesJournal of the Serbian Chemical Society, 2005
Three new thiophene based organic luminescence compounds, i.e., 2,5-bis(4’-N,N-dimethylaminostyryl) thiophene (BMST), 2,5-bis(4’-N,N-diethylaminostyryl)thiophene (BEST) and 2,5-bis(4’-N-cyclobutylaminostyryl)thiophene (BBST), were synthesized.
PING LU, GUANG MING XIA
doaj   +3 more sources

Substitution of antibodies and receptors with molecularly imprinted polymers in enzyme-linked and fluorescent assays [PDF]

open access: yes, 2001
A new technique for coating microtitre plates with molecularly imprinted polymers (MIP), specific for low-molecular weight analytes (epinephrine, atrazine) and proteins is presented.
Bossi, Alessandra   +5 more
core   +1 more source

A simple and easy to perform synthetic route to functionalized thienyl bicyclo[3.2.1]octadienes

open access: yesBeilstein Journal of Organic Chemistry, 2020
In order to prepare novel polycyclic derivatives of bicyclo[3.2.1]octadiene systems fused with a thiophene ring, photochemical cyclization and aldol condensation reactions were carried out.
Dragana Vuk   +4 more
doaj   +1 more source

Investigation of physical and chemical properties of new derivatives of 5-(thiophene-3-ylmethyl)-4R-1,2,4-triazole-3-thiols

open access: yesAktualʹnì Pitannâ Farmacevtičnoï ì Medičnoï Nauki ta Praktiki, 2021
Heterocyclic compounds are one of the most important branches of modern organic chemistry and are widely used in medicine, pharmacy, agriculture, and in the production of new materials.
A. V. Khilkovets
doaj   +1 more source

Tuning of the luminescence in poly((silanylene)thiophene)s [PDF]

open access: yes, 1995
Synthetic routes to alternating copolymers consisting of oligosilylene blocks and oligothiophene blocks (T-x; x = 1, 2, 3, 4, or 6 rings) are presented.
Gill, R.E   +5 more
core   +4 more sources

Scientific Opinion on Flavouring Group Evaluation 21, Revision 2 (FGE.21Rev2): Thiazoles, thiophene, thiazoline and thienyl derivatives from chemical group 29. Miscellaneous substances from chemical group 30

open access: yesEFSA Journal, 2011
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to evaluate 56 flavouring substances in the Flavouring Group Evaluation 21, Revision 2, using the Procedure in Commission ...
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Sulfur analysis of Bolu-Mengen lignite before and after microbiological treatment using reductive pyrolysis and gas chromatography/mass spectrometry [PDF]

open access: yes, 2005
Atmospheric pressure-temperature programmed reduction coupled with on-line mass spectrometry (AP-TPR/MS) is used for the first time on microbiologically treated coal samples as a technique to monitor the degree of desulfurization of the various sulfur ...
Bozdemir T.   +27 more
core   +1 more source

Tuning the electronic, photophysical and charge transfer properties of small D-A molecules based on Thienopyrazine-terthienyls by changing the donor fragment: A DFT study [PDF]

open access: yes, 2017
Indexación: Scopus.Four acceptor-donor organic conjugated molecules based on thieno[3,4-b]pyrazine-terthienyls were analyzed in order to explore the effect of the donor substituent on their molecular structures, electronic and optical properties. Density
Aicha, Y.A.   +7 more
core   +1 more source

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