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Recent Applications of Quinolinium Salts in the Synthesis of Annulated Heterocycles

open access: yesSynOpen, 2022
Quinoline derivatives are frequently found in natural products and biologically active compounds; however, construction of quinoline fused polyheterocycles is a challenging goal in synthetic organic chemistry.
Suven Das
doaj   +1 more source

[3+3]-Annulation of Cyclic Nitronates with Vinyl Diazoacetates: Diastereoselective Synthesis of Partially Saturated [1,2]Oxazino[2,3-b][1,2]oxazines and Their Base-Promoted Ring Contraction to Pyrrolo[1,2-b][1,2]oxazine Derivatives

open access: yesMolecules, 2023
A rhodium(II)-catalyzed reaction of cyclic nitronates (5,6-dihydro-4H-1,2-oxazine N-oxides) with vinyl diazoacetates proceeds as a [3+3]-annulation producing bicyclic unsaturated nitroso acetals (4a,5,6,7-tetrahydro-2H-[1,2]oxazino[2,3-b][1,2]oxazines ...
Yulia A. Antonova   +3 more
doaj   +1 more source

Regioselective Three-Component Reaction of Pyridine N-Oxides, Acyl Chlorides, and Cyclic Ethers [PDF]

open access: yesOrganic Letters, 2017
A novel three-component reaction of pyridine N-oxides, acyl chlorides, and cyclic ethers is described. Treatment of an electron-deficient pyridine N-oxide with an acyl chloride in the presence of a cyclic ether at 25-50 °C leads to a substituted pyridine as a single regioisomer in up to 58% isolated yield.
D. Heulyn Jones   +4 more
openaire   +3 more sources

Rhodium-Based Catalysts: An Impact of the Support Nature on the Catalytic Cyclohexane Ring Opening

open access: yesNanomaterials, 2023
Because of the growing demand for high-quality fuels, the light cycle oil fraction improvement including cetane number improvement is important. The main way to reach this improvement is the ring opening of cyclic hydrocarbons, and a highly effective ...
Kristina E. Kartavova   +10 more
doaj   +1 more source

Mechanisms of High Temperature Degradation of Thermal Barrier Coatings. [PDF]

open access: yes, 2009
Thermal barrier coatings (TBCs) are crucial for increasing the turbine inlet temperature (and hence efficiency) of gas turbine engines. The thesis describes PhD research aimed at improving understanding of the thermal cycling failure mechanisms of ...
Wu, Rudder T.C., Wu, Rudder T.C.
core   +1 more source

New Conjugated Benzothiazole-N-oxides: Synthesis and Biological Activity

open access: yesMolecules, 2009
Eleven new 2-styrylbenzothiazole-N-oxides have been prepared by aldol – type condensation reactions between 2-methylbenzothiazole–N-oxide and para-substituted benzaldehydes.
Pavlína Foltínová   +3 more
doaj   +1 more source

Oxidation of tertiary amine-derivatized surfaces to control protein adhesion [PDF]

open access: yes, 2013
Selective oxidation of omega-tertiary amine self-assembled thiol monolayers to tertiary amine N-oxides is shown to transform the adhesion of model proteins lysozyme and fibrinogen upon them.
Biggs, Caroline I.   +10 more
core   +1 more source

Study Reactions of acetylenic amine N-Oxidewith reactive Halides [PDF]

open access: yesمجلة جامعة الانبار للعلوم الصرفة, 2012
new acetylenic amine derived from cyclic secondary amines such as piperidine were synthesized , these amine were oxidized with m-chloroper benzoic acid to the corresponding N-Oxides.
Omar H. Shehab
doaj   +1 more source

Characterization of Fe implanted yttria-stabilized zirconia by cyclic voltammetry [PDF]

open access: yes, 1992
The technique of cyclic voltammetry has been applied to study reduction and oxidation phenomena which are observed at low oxygen partial pressures during steady state current-overpotential measurements of the Au, O2(g)/Fe implanted yttria-stabilized ...
Burggraaf, A.J., Hassel, B.A. van
core   +2 more sources

Qualitative characterization of healthcare wastes [PDF]

open access: yes, 2020
The biological hazard inherent in the clinical wastes should be considered during the management and treatment process as well as the disposal into the environment.
A Graikos   +22 more
core   +1 more source

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