Results 11 to 20 of about 1,736 (145)

Carcinogenicity of 1,3-Butadiene

open access: yesEnvironmental Health Perspectives, 1992
1,3-Butadiene, a high-production volume chemical used largely in the manufacture of synthetic rubber, is a multiple organ carcinogen in rats and mice. In inhalation studies conducted in mice by the National Toxicology Program, high rates of early lethal lymphomas occurring at exposure levels of 625 ppm or higher reduced the development and expression ...
R L, Melnick, C C, Shackelford, J, Huff
openaire   +3 more sources

Synthesis of some novel annulated pyrido[2,3-d]pyrimidines via stereoselective intramolecular hetero Diels–Alder reactions of 1-oxa-1,3-butadienes

open access: yesBeilstein Journal of Organic Chemistry, 2010
Some novel annulated pyrido[2,3-d]pyrimidines 6 and 7 were synthesized stereoselectively by intramolecular hetero Diels–Alder reactions involving 1-oxa-1,3-butadienes.
Mohit L. Deb, Pulak J. Bhuyan
doaj   +1 more source

Thermal Decomposition of Vicinal Dinitroalkanes

open access: yesCHIMIA, 1988
Three sym-tetraalkyl-dinitroethanes 1-3 have been decomposed in solution at 180 to 215 °C. The alkylated 1,3-butadienes 10,12, and 13 are formed by elemination of HNO2.
Katharina Fritzsche   +2 more
doaj   +1 more source

(E)-1,1,1-Trifluoro-6,6-bis(4-methoxyphenyl)hexa-3,5-dien-2-one

open access: yesMolbank, 2020
The title compound was obtained in high yield (84%) via the deacetylation of 3-(3,3-bis(4-methoxyphenyl)allylidene)-1,1,1,5,5,5-hexafluoro-2,4-pentanedione with K2CO3 in refluxing methanol. This previously unreported compound has been fully characterized
Victorio Cadierno
doaj   +1 more source

Generation of 1,2-oxathiolium ions from (arysulfonyl)- and (arylsulfinyl)allenes in Brønsted acids. NMR and DFT study of these cations and their reactions

open access: yesBeilstein Journal of Organic Chemistry, 2018
In strong Brønsted acids (CF3SO3H, FSO3H, D2SO4), (arysulfonyl)allenes (ArSO2–CR1=C=CR2R3) and (arylsulfinyl)allenes (ArSO–CR1=C=CR2R3) undergo cyclization into the corresponding stable 1,2-oxathiolium ions, which were studied by means of NMR and DFT ...
Stanislav V. Lozovskiy   +3 more
doaj   +1 more source

Arylthio-substituierte Nitrilylide aus der Thermolyse von 4-Arylthio-3-oxazolin-5-onen

open access: yesCHIMIA, 1984
Thermolysis of 4-arylthio- and 4-benzylthio-3-oxazolin-5-ones leads to arylthio- and benzylthio-substituted nitrile ylides, which undergo 1,3-dipolar cycloadditions with reactive dipolarophiles to give 5-membered aza-heterocycles (Schemes 1 and 2).
Peter Wipf, Heinz Heimgartner
doaj   +1 more source

Synthesis of 6-Nitroderivatives of Oxazolo[3,2-a]-pyridines and Their Reactions with Nucleophiles

open access: yesMolecules, 2003
5-Nitro-2-pyridone can be selectively N-phenacylated, and the resulting phenacylpyridones I undergo cyclization to 6-nitrooxazolo[3,2-a]pyridinium salts II.
Eugene V. Babaev, Alexander A. Bush
doaj   +1 more source

Synthesis of (Thio)substituted -1,3-Butadienes and -Butenynes

open access: yesJournal of the Turkish Chemical Society, Section A: Chemistry, 2019
In this study, 2H-1,1,3,4,4-pentachloro-1,3-butadiene (1) reacted with different thiols (2-Methyl-2-propanethiol 2a, Benzyl mercaptan 2b, 4-tert-butylbenzenethiol 2c, 4-Nitrothiophenol 2d) in ethanol in the presence of NaOH to afford mono-thio ...
Ayşecik Kaçmaz
doaj   +1 more source

New Piperazine Derivatives Synthesized from Thio-Substituted Polyhalogeno-2-nitro-1,3-butadienes

open access: yesE-Journal of Chemistry, 2010
It is known that polyhalogeno-nitro-1,3-butadienes are important starting materials for the synthesis of polyfunctionalized bioactive heterocycles.
S. Goksin Aydinli, Cemil Ibis
doaj   +1 more source

4-Bromo-2H-1,3-oxazine-2,6(3H)-dione

open access: yesActa Crystallographica Section E, 2009
The title compound, C4H2BrNO3, is one of a series of three substituted oxauracils prepared as precursors in the preparation of 1-aza-1,3-butadienes. Although each structure has identical potential for N—H...O intermolecular hydrogen bonds, each
Damon Parrish   +3 more
doaj   +1 more source

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