Results 21 to 30 of about 58,617 (322)
Beilstein 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
CHIMIA, 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
Molbank, 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
Beilstein 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
CHIMIA, 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
Molecules, 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
Factors Controlling the Diels–Alder Reactivity of Hetero‐1,3‐Butadienes
ChemistryOpen, 2018 We have quantum chemically explored the Diels–Alder reactivities of a systematic series of hetero‐1,3‐butadienes with ethylene by using density functional theory at the BP86/TZ2P level.
Song Yu +4 more
semanticscholar +1 more source
Organic Letters, 2018 An environmentally responsible, mild method for the synthesis of functionalized 1,3-butadienes is presented. It utilizes allenic esters of varying substitution patterns, as well as a wide range of boron-based nucleophiles under palladium catalysis ...
Daniel J. Lippincott +4 more
semanticscholar +1 more source
Synthesis of (Thio)substituted -1,3-Butadienes and -Butenynes
Journal 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
Organic Letters, 2017 Reactions between 1,4-dibromo-1,3-butadienes and 2,5-disubstituted pyrroles afforded cyclopenta[c]pyridine derivatives in high yield, catalyzed by palladium and a cyclopentadiene-phosphine ligand (L1).
Jianhao Yin +6 more
semanticscholar +1 more source