Results 211 to 220 of about 13,292 (250)

Cyclic nitronic esters

Tetrahedron, 1970
Abstract The role of structure in the reaction between enamines and nitroolefins has been evaluated. A synthetic method is presented for preparing substituted cyclic nitronic esters incorporating a 6-membered ring. Reaction of cyclopentanone, cyclohexanone and cycloheptanone enamines derived from pyrrolidine and morpholine with 2-nitro-1 ...
T.G. Archibald, A.T. Nielsen
openaire   +2 more sources

A Protocol To Transform Sulfones into Nitrones and Aldehydes.

Organic Letters, 2018
A simple method to transform sulfones into nitrones and therefore into the corresponding carbonyl derivatives has been developed. Some examples demonstrate that it is a new reliable and versatile reaction in the toolbox of sulfones that has great ...
Eduardo Rodrigo, I. Alonso, M. Cid
semanticscholar   +1 more source

Nitrones and Cyclic Analogues [PDF]

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +1 more source

Nitrone Oder Anile?

Chemische Berichte, 1957
AbstractDie Einwirkung von p‐Nitroso‐dialkylanilin auf 2‐ und 4‐Picolin‐jodmethylat ist grundsätzlich verschieden von der Nitron‐Bildung aus N‐Methylen‐pyridini‐umsalzen. Sie führt, wie eine einfache Methode der Abtrennung von Nitronen in Anil/Nitron‐Gemischen zeigt, überwiegend zu Anilen, auch wenn man die Nitron‐Bildung begünstigt.
Fritz Kröhnke, Heinrich Leister, Isolde Vogt   +2 more
openaire   +2 more sources

Nitrone cycloadditions. regiochemistry.

Tetrahedron Letters, 1979
Abstract The regiochemistry of nitrone cycloadditions has been reexamined. Certain nitrones afford regioisomeric mixtures of isoxazolidines, with a tendency toward increasing amounts of the 4-substituted regioisomer as the ionization potential of the dipolarophile is increased.
Joseph J. Tufariello, Sk. Asrof Ali, Carl R. Illig, Harold Meckler, Pushpananda A. Senaratne   +4 more
openaire   +2 more sources

Asymmetric "Acetylenic" [3+2] Cycloaddition of Nitrones Catalyzed by Cationic Chiral PdII Lewis Acid.

Chemistry - An Asian Journal, 2018
Highly enantioselective [3+2] cycloaddition of ynones and nitrones has been developed. Very bulky ligand, DTBM-SEGPHOS, was used for an effective asymmetric induction over distal reaction centers on the linear ynone dipolarophile and for prevention of ...
K. Honda, K. Mikami
semanticscholar   +1 more source

Studies on gold–nitrone systems

Dalton Transactions, 2019
The dual reactivity of gold-nitrone systems was studied. A series of novel Au(i)–nitrone complexes with specific catalytic properties were prepared.
Helgi Freyr Jónsson, Anne Fiksdahl
openaire   +3 more sources

The periodate oxidation of nitrones

Journal of the Chemical Society C: Organic, 1966
The periodate oxidation of some Δ1-pyrroline 1-oxides with two substituents at C-5 but unsubstituted at C-2 leads to a series of 4-nitrosopentanoic acids. Evidence is adduced for the course of the reaction. An N-alkylhydroxyamino-compound is oxidised in chloroform to the nitroso-compound by tetraethylammonium periodate, a potentially useful reagent ...
A. K. Qureshi, B. Sklarz
openaire   +2 more sources

Paired Electrosynthesis of a Nitrone

Chemistry Letters, 1997
Abstract Dibutyl N-hydroxylamine was oxidized by WO42−/WO52−/ and BR−/Br2 redox mediators at cathode and anode, respectively. The corresponding nitrone, N-butylidenebutylamine N-oxide, was prepared at the both electrodes in divided and undivided cells. The paired electrosynthesis of the nitrone could be realized with current efficiencies
Tsutomu Nonaka, Wei Li
openaire   +2 more sources

Site-, enantio- and stereo-selectivities of the 1,3-dipolar cycloaddition reactions of oxanorbornadiene with C,N-disubstituted nitrones and dimethyl nitrilimines: a DFT mechanistic study

Theoretical Chemistry accounts, 2020
Ernest Opoku, Grace Arhin, George Baffour Pipim, Anita Houston Adams, Richard Tia, E. Adei   +5 more
semanticscholar   +1 more source