Results 191 to 200 of about 13,292 (250)
Some of the next articles are maybe not open access.
ChemInform Abstract: REACTIONS OF NITRONES WITH KETENES
Chemischer Informationsdienst, 1979AbstractReview: Die Übersichtsarbeit behandelt die Reaktionen von Nitronen (I) und heteroaromatischen N‐Oxiden (II) mit Ketenen (III).
Magid Abou-Gharbia +1 more
openaire +2 more sources
Nucleophilic Additions to Nitrones
Synthesis, 2000AbstractChemInform 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.
Marco Lombardo, Claudio Trombini
openaire +3 more sources
Angewandte Chemie, 2019
An approach to cyclic nitrones from N-hydroxylactam derivatives is documented. The nucleophilic addition of an organolithium reagent to an N-OSEM [SEM=2-(trimethylsilyl)ethoxymethyl] lactam forms a five-membered chelated intermediate, which undergoes ...
Shobu Hiraoka +4 more
semanticscholar +1 more source
An approach to cyclic nitrones from N-hydroxylactam derivatives is documented. The nucleophilic addition of an organolithium reagent to an N-OSEM [SEM=2-(trimethylsilyl)ethoxymethyl] lactam forms a five-membered chelated intermediate, which undergoes ...
Shobu Hiraoka +4 more
semanticscholar +1 more source
Green Chemistry, 2019
A new and environmentally benign protocol aimed at the generation of triarylated (Z)-nitrones in generally good yield has been developed via metal- and catalyst-free H2O-mediated 1,3-dipolar transfer reaction of para-quinone methides (p-QMs) with ...
Ke-Wei Chen +3 more
semanticscholar +1 more source
A new and environmentally benign protocol aimed at the generation of triarylated (Z)-nitrones in generally good yield has been developed via metal- and catalyst-free H2O-mediated 1,3-dipolar transfer reaction of para-quinone methides (p-QMs) with ...
Ke-Wei Chen +3 more
semanticscholar +1 more source
Nitronic Acids and Their Derivatives [PDF]
ChemInform, 2005 AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire +1 more source
Iridium(III)-Catalyzed C-H Amidation of Nitrones with Dioxazolones.
Journal of Organic Chemistry, 2019Various amidated nitrones were efficiently achieved through Ir(III)-catalyzed direct C-H amidation of nitrones with good to excellent yields and tolerance of broad functional groups.
Xia Mi, Wei Feng, C. Pi, Xiuling Cui
semanticscholar +1 more source
ACS Catalysis, 2019
The catalytic formation of various fused indoles from the nitrone oxidations of 1-substituted n-yn-1-ols (n = 2, 3) is described. For 3-butyn-1-ols, the oxidations yield tetrahydropyrano[4,3-b]indoles, whereas 2-propynols deliver tetrahydro-[1,2]oxazino ...
Rajkumar Lalji Sahani, Rai‐Shung Liu
semanticscholar +1 more source
The catalytic formation of various fused indoles from the nitrone oxidations of 1-substituted n-yn-1-ols (n = 2, 3) is described. For 3-butyn-1-ols, the oxidations yield tetrahydropyrano[4,3-b]indoles, whereas 2-propynols deliver tetrahydro-[1,2]oxazino ...
Rajkumar Lalji Sahani, Rai‐Shung Liu
semanticscholar +1 more source
Nitrones and oxaziridines. VII. Cycloaddition reactions of nitrones with carbon disulphide
Australian Journal of Chemistry, 1973The cyclic aldo nitrones (3)-(5) undergo cycloaddition reactions with carbon disulphide to yield the related thiolactams (6)-(8), presumably via intermediate 1,4,2-oxathiazolidine-5-thiones, which could not be isolated or detected. N-(Benzylidene)-methylamine N-oxide undergoes a similar conversion into the related thioamide, but the reaction is not ...
Dsc Black, Keith G. Watson
openaire +2 more sources
Nitrones. Part V. The reaction of a cyclic nitrone with diethyl malonate
Journal of the Chemical Society C: Organic, 1967The cyclic nitrone, 5,5-dimethyl-1-pyrroline 1-oxide, has been shown to react with diethyl malonate, under basic conditions, to yield 4-ethoxycarbonyl-8,8-dimethyl-2-oxa-1-azabicyclo[3,3,0]octan-3-one. Reduction of this product with lithium aluminium hydride yielded 2-(1-hydroxy-5,5-dimethylpyrrolidin-2-yl)propane-1,3-diol, while thermal degradation ...
M. Lamchen, L. S. Kaminsky
openaire +2 more sources
Tetrahedron, 1968
Abstract The mass spectra of a series of nitrones are reported and discussed. All spectra contain molecular ions, and the majority of fragment ions owe their genesis to skeletal-reorganization of the molecular ion. Fragmentation modes have been substantiated by high-resolution data and appropriate metastable ions. Deuterium labelling has been used to
Gustav Schroll +4 more
openaire +2 more sources
Abstract The mass spectra of a series of nitrones are reported and discussed. All spectra contain molecular ions, and the majority of fragment ions owe their genesis to skeletal-reorganization of the molecular ion. Fragmentation modes have been substantiated by high-resolution data and appropriate metastable ions. Deuterium labelling has been used to
Gustav Schroll +4 more
openaire +2 more sources