Results 201 to 210 of about 19,273 (245)
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REACTIONS OF CYCLIC AZA-YLIDES WITH β-DICARBONYL COMPOUNDS
Phosphorus, Sulfur and Silicon and the Related Elements, 2001Abstract The reactions of five- and six-membered cyclic iminophosphoranes, 3 and 4, with β-dicarbonyl compounds gave enamino phosphine oxide derivatives 5a-h in good yields. Compounds 5b and 5e were stereoselectively converted to 1,6- and 1,7-diene 9a and 9b.
Tetsuya Fujimoto
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Polynuclear Aza Compounds in Automotive Exhaust
Archives of Environmental Health: An International Journal, 1965cancer. Wynder cites evidence that cigarette smoking plays the major role in the etiology of lung cancer. Hueper gives evidence that cigarette smoking is only one of many factors including air pollution which play a significant role in causing lung cancer.
E, Sawicki, J E, Meeker, M, Morgan
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NOVEL HETEROCYCLIC COMPOUNDS VIA AZA- AND BIS-AZA-WITTIG REACTIONS
Phosphorus, Sulfur, and Silicon and the Related Elements, 1991Abstract Two quinoxaline derivatives, 1 and 2, were prepared via a bis-aza-Wittig reaction when the suitable aromatic diamine was treated with (MeO)3PBr2/Et3N followed by the addition of benzil. Also, two additional novel heterocyclic compounds, 4 and 6 were prepared via an intramolecular aza-Wittig reaction.
Hamad Z. Alkhathlan, Hamad A. Al-lohedan
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The Synthesis of Fluorine-containing Aza-macrocyclic Compounds
HETEROCYCLES, 1992Four aza-macrocyclic compounds were synthesized by reactions of phthalaldehydes and phthaloyl chlorides with N,N'-di(2-aminomethyl-3-fluorophenyl)- ethylenediamine(8) and their structures were identified.
Shing-Sung Chi +3 more
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Decyanation of cyanomethyl derivatives of aza‐aromatic compounds
Recueil des Travaux Chimiques des Pays-Bas, 1972Abstract2‐ and 4‐Cyanomethylpyridine, 1‐methyl‐ and 1‐benzyl‐2‐cyanomethylimidazole and 3‐cyanomethyl‐1,2,4‐triazole lose the cyano group on reaction with aqueous hydrazine at about 200°, yielding α‐ and γ‐picoline, 1,2‐dimethyl‐ and 1‐benzyl‐2‐methylimidazole and 3‐methyl‐1,2,4‐triazole, respectively. A mechanism is discussed.
H. C. van der Plas, H. Jongejan
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Research on 1-aza two-ring compounds
Chemistry of Heterocyclic Compounds, 1978The applicability of competitive quaternization for the configurational assignment of isomers of 3-substituted pyrrolizidines is demonstrated. The method can be used for the preparative isolation of the isomer from mixtures.
I. M. Skvortsov, I. V. Antipova
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First synthesis of aza-calanolides—a new class of anti-HIV active compounds
Tetrahedron, 2003 First synthesis of (±)-aza-calanolides, starting from dimethoxy aniline, is achieved.
A Ilangovan, Mukund K Gurjar
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Synthesis of Aza-, Oxa-, and Thiaporphyrins and Related Compounds
Chemical Reviews, 2016Chemical modification at the periphery with nitrogen or chalcogens is a highly promising strategy to diversify the optical, electrochemical, magnetic, and coordination properties of the porphyrin family. Indeed, various kinds of phthalocyanines and related benzo-annelated azaporphyrinoids have been synthesized, and their fundamental properties have ...
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Electronic effects in cations of aza-aromatic compounds
Chemistry of Heterocyclic Compounds, 1975The ionization constants of quaternary salts of hydroxy derivatives of quinolinium and benzo[h]quinolinium ions correlate satisfactorily (r=0.99, s=0.07) with the σj constants calculated by a modified F,M method. Correlation analysis makes it possible to assume that the electron distribution in the benzene fragments of the investigated cations is ...
K. V. Veksler +4 more
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ChemInform Abstract: Novel Heterocyclic Compounds via Aza‐ and Bis‐aza‐Wittig Reactions.
ChemInform, 1992AbstractChemInform 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.
H. Z. ALKHATHLAN, H. A. AL‐LOHEDAN
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