Results 161 to 170 of about 7,868 (205)

Nitrones—V

Tetrahedron, 1978
Abstract Reactions of 3,4-dihydroisoquinoline N-oxide ( 1 ) with carbomethoxymethyldiphenylphosphine oxide ( 13 ) and cyanomethyldiphenylphosphine oxide ( 14 ) lead both in 1,2-dimethoxyethane (DME) and in t-BuOH mostly to enamines 6 and 7 respectively.
Eli Breuer, Shmuel Zbaida
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Cyclic nitrones. I. Reactions of α-keto nitrones at nitrone carbon

Australian Journal of Chemistry, 1967
The chemistry of 3,4,5,6-tetrahydro-3-oxopyridine 1-oxides has been studied with respect to: reaction with hydrazine-the 6,6-dimethyl compound (IV) gave a hydrazone (VII) by ring contraction following initial attack at C 2; (ii)(ii) 2-arylation with diazonium salts, e.g.
L Subrahmanyan, Rfc Brown, CP Whittle
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Nitrones and oxaziridines. VIII. Cycloaddition reactions of nitrones with isothiocyanates

Australian Journal of Chemistry, 1973
Whereas nitrones undergo cycloaddition to the C=N double bond of phenyl isothiocyanate, predominant addition to the C=S double bond of substituted phenyl isothiocyanates, methyl isothiocyanate and benzoyl isothiocyanate occurs. However, these cycloadducts are not stable but undergo fragmentation usually with the formation of thioamides and isocyanates.
Dsc Black, Keith G. Watson
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Nitrones. Part III. Photolysis of cyclic nitrones

Journal of the Chemical Society C: Organic, 1966
Ultraviolet irradiation of 2-substituted 1-pyrroline 1-oxides yielded corresponding bicyclic oxaziridines. Prolonged irradiation of the 3,3,5-trimethyl-6-oxa-1-azabicyclo[3,1,0]hexane gave an N-acetylazetidine and a pyrroline. Acid hydrolyses of 2,2,5- and 3,3,5-trimethyl-6-oxa-1-azabicyclo[3,1,0]hexane yielded acetonylacetone and 3,3-dimethylpentan-5 ...
L. S. Kaminsky, M. Lamchen
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C−H Reactivity of the α‐Position in Nitrones and Nitronates

Advanced Synthesis & Catalysis, 2019
AbstractThe review summarizes the chemistry of nitrones and nitronates in the context of the C−H reactivity of their α‐carbon atoms. Electrophilic, nucleophilic and radical reactions leading to functionalization of the α‐position are described. Examples of the application of these processes in total synthesis are outlined.magnified image
Alexey Yu. Sukhorukov   +1 more
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Studies on the chemistry of the chiral nitronic acid and nitronic esters

Tetrahedron: Asymmetry, 1997
Abstract Some new chemistry of the chiral nitronic acid and nitronic esters is described. Conversions with retention of configuration are found among the chiral nitronic acid, oxime, nitronic esters and O -alkyloximes. α,β-Elimination reactions of nitronic esters are observed for the first time. Novel and enantiopure chiral bisheterocyclic compounds
Cheng-Lie Yin, Fu-An Kang
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