Results 181 to 190 of about 7,868 (205)
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Nitrones. 7. .alpha.-Quinoxalinyl-N-substituted nitrone 1,4-dioxides
Journal of Medicinal Chemistry, 1977A series of alpha-quinoxalinyl-N-substitute nitrone 1,4-dioxides has been synthesize and evaluated as antibacterial and antiprotozoal agents. Structure-activity relationships are discussed. Of the compounds tested, alpha-(3-methyl-2-quinoxalinyl)-N-methylnitrone 1,4-dioxide (2) was the most active agent in vivo against the gram-negative and the gram ...
Hyun Koo Kim +3 more
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Cycloadditions of chiral nitrones
J. Chem. Soc., Chem. Commun., 1977AbstractAus den chiralen Nitronen (I) entstehen mit den Olefinen (II) die Addukte (III), mit Phenylisocyanat (IV) analog die Oxadi‐ ′azolidinone (V).
Irma Panfil, Czeslaw Belzecki
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Trimethylaluminum‐Assisted Alkynylation of Nitrones.
ChemInform, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Tanasri Bunlaksananusorn +2 more
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Correlation between structure and stability of nitronic acids and nitronic esters
Science in China Series B: Chemistry, 1998On the basis of investigation on structural characteristics and stability of more than one hundred nitronic acids and nitronic esters, an equilibrium theory of electronic effects in conjugated systems is put forward and the type of structures is classified. On that basis, an empirical rule for the correlation between structure and stability of nitronic
Chenglie Yin, Fu’an Kang
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The Cycloaddition of Nitrones with Homochiral Cyclopropanes
The Journal of Organic Chemistry, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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.
Katarina Sapeta, Michael A. Kerr
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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
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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
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Nitrones and Cyclic Analogues [PDF]
ChemInform, 2005 AbstractFor Abstract see ChemInform Abstract in Full Text.
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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 +2 more
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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 +2 more
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Nitrone cycloadditions. regiochemistry.
Tetrahedron Letters, 1979Abstract 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 +4 more
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Studies on gold–nitrone systems
Dalton Transactions, 2019The 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
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