Results 241 to 250 of about 81,546 (283)

ChemInform Abstract: STRAINED CYCLIC ACETYLENES, VII. ADDITION OF SULFUR AND PYRIDINE N‐OXIDE TO SEVEN MEMBERED CYCLOALKYNES

Chemischer Informationsdienst, 1980
AbstractDie cyclischen Acetylene (Ia) und (Ib) addieren elementaren Schwefel zu den Dithieten (IIa) und (IIb), mit Pyridin‐N‐oxid (III) und (Ia) IÖO wird das Spiroazepin (IV) erhalten, das thermisch in das Pyridylthiepinon (V) umgelagert werden kann.
A. KREBS, H. COLBERG, U. + HOEPFNER, H. KIMLING, J. ODENTHAL   +4 more
openaire   +1 more source

ChemInform Abstract: An Efficient and Chemoselective Deoxygenation of Hetero Cyclic N‐Oxides Using LiCl/NaBH₄.

ChemInform, 2000
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
S. Raja Ram, K. Purushothama Chary, D. S. Iyengar   +2 more
openaire   +1 more source

NMR spectra of cyclic nitrones. 4. Synthesis and 13C NMR spectra of 4H-imidazole N-oxides and N,N-dioxides

Chemistry of Heterocyclic Compounds, 1988
4H-Imidazole 1,3-dioxides and 4H-imidazole 3-oxides were obtained by oxidation of 1-hydroxy-3-imidazoline 3-oxides and 1-hydroxy-3-imidazolines with lead and manganese dioxides or the stable nitroxyl radical, while 4H-imidazole 1-oxides were obtained by thermal decomposition of 1-acetoxy-3-imidazoline 3-oxides.
I. A. Grigor'ev, I. A. Kirilyuk, L. B. Volodarskii   +2 more
openaire   +1 more source

ChemInform Abstract: Palladium‐Catalyzed Coupling Reactions of Thioimidate N‐Oxides: Access to α‐Alkenyl‐ and α‐Aryl‐Functionalized Cyclic Nitrones.

ChemInform, 2010
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Julie Schleiss, Patrick Rollin, Arnaud Tatibouet   +2 more
openaire   +1 more source

Bicyclic 1,2-oxazine N-oxides. Different behaviour in ring fission between systems derived from 5- and 6-membered ring cyclic enamines

Tetrahedron, 1982
Abstract 1,2-Oxazine N-oxides derived from aminocyclohexenes open into the corresponding nitroalkylated trisubstituted enamines, whereas those derived from aminocyclopentenes give stable tetrasubstituted enamines. Both open-chain systems are easily hydrolyzed to the corresponding γ-nitrocycloalkanones.
DANEO S., PITACCO, GIULIANA, RISALITI A., VALENTIN, ENNIO   +3 more
openaire   +2 more sources

ChemInform Abstract: A Novel and Efficient Deoxygenation of Hetero Cyclic N‐Oxides Using ZrCl₄/NaBH₄.

ChemInform, 2000
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
K. Purushothama Chary, G. Hari Mohan, D. S. Iyengar   +2 more
openaire   +1 more source

ChemInform Abstract: NMR Spectra of Cyclic Nitrones. Part 4. Synthesis and 13C NMR Spectra of 4H‐Imidazole N‐Oxides and N,N‐Dioxides.

ChemInform, 1989
AbstractOxidation of the 1‐hydroxy‐3‐imidazoline 3‐oxides (I) or the 1‐hydroxy‐3‐imidazolines (IIIa) and (IIIc) gives the dioxides (II) or the 4H‐imidazole 3‐monoxides (IVa) and (IVc).
I. A. GRIGOR'EV, L. A. KIRILYUK, L. B. VOLODARSKII   +2 more
openaire   +1 more source

Formation of a cyclic adenine adduct with a 4-nitroquinoline N-oxide metabolite model.

IARC scientific publications, 1987
Pentacyclic adducts are obtained in the reaction of adenine derivatives with the diacetyl ester of 4-hydroxyamino quinoline oxide, the postulated metabolite of the potent carcinogen, 4-nitroquinoline N-oxide (4-NQO).
N, Tohme, M, Demeunynck, M F, Lhomme, J, Lhomme   +3 more
openaire   +1 more source

ChemInform Abstract: THERMAL REARRANGEMENTS OF CYCLIC AMINE YLIDES. IV. REARRANGEMENT OF β,Γ‐UNSATURATED 1‐ALKYLPIPERIDINE N‐OXIDES: FORMATION OF 1,2‐OXAZEPINE DERIVATIVES

Chemischer Informationsdienst, 1985
AbstractDie thermische Umlagerung der aus den Verbindungen (I) und (III) dargestellten N‐Oxide (II) und (IV) führt unter Ringerweiterung zu den Oxazepinen (V), (VI), (IX) und (X).
H. SASHIDA, T. TSUCHIYA
openaire   +1 more source

ChemInform Abstract: 2‐CHLORO‐4,5‐DIHYDROIMIDAZOLE; I. REACTIONS WITH SOME HETEROAROMATIC N‐OXIDES, CYCLIC NITRONES, AND ALDOXIMES

Chemischer Informationsdienst, 1984
Abstract2‐Chlorimidazolin ( l) reagiert mit Chinolin‐ N‐oxiden (II) über die Zwischenstufe cyclischer Addukte zu 2‐lmidazolidinon‐Derivaten (III) und (IV).
openaire   +1 more source