Results 81 to 90 of about 154 (130)

NitropyridineS. 9*. Synthesis of substituted 3-amino-5-nitropyridines

Chemistry of Heterocyclic Compounds, 2011
Substituted 3-amino-5-nitropyridines have been synthesized by the Curtius, Schmidt, and Hofmann reactions.
G P Sagitullina, A K Garkushenko, M A Vorontsova   +2 more
exaly   +2 more sources

Nitropyridines: VI. Synthesis of 2-aryl(hetaryl)- and 2,3-polymethylene-5-nitropyridines

Russian Journal of Organic Chemistry, 2009
Previously unknown 2-aryl-, 2-hetaryl-, and 2-cyclopropyl-5-nitropyridines and 2,3-polymethylene-5-nitropyridines were synthesized by reactions of 1-methyl-3,5-dinitropyridin-2(1H)-one with various cyclic and acyclic ketones in the presence of ammonia.
G P Sagitullina, A K Garkushenko, E G Atavin   +2 more
exaly   +2 more sources

Ultraviolet and electron spin resonance spectra of nitropyridines and nitropyridine N-oxides

The Journal of Physical Chemistry, 1973
The esr and uv spectra of 2-, 3-, and 4-nitropyridine and 2-, 3-, and 4-nitropyridine N-oxide anion radicals in solution have been measured as well as the uv spectra of 2-, 3-, and 4-nitropyridine N-oxide neutral molecules in the same solvent. The results have been interpreted by application of a number of semiempirical quantum mechanical methods.
A. Gamba, V. Malatesta, G. Morosi, C.Oliva, M. Simonetta   +4 more
openaire   +1 more source

Nitropyridines. 1. Hantzsch Synthesis of Nitropyridines and Their Quaternary Salts

Chemistry of Heterocyclic Compounds, 2002
Previously unknown 1,4-dihydropyridines containing acetyl, amide, benzoyl, ester, and cyano groups together with a nitro group were synthesized with preparative yields by a two-component Hantzsch synthesis based on 2-nitro-1,3-diphenylpropenone and various enamines. The nitrodihydropyridines were aromatized with sodium nitrite in acetic acid.
G. P. Sagitullina, L. V. Glizdinskaya, G. V. Sitnikov, R. S. Sagitullin   +3 more
openaire   +1 more source

Nucleophilic Alkylations of 3‐Nitropyridines.

ChemInform, 2004
3-Nitropyridine and 4-substituted-3-nitropyridines were reacted with chloroform, methyl chloroacetate and ethyl 2-chloropropionate under vicarious nucleophilic substitution (VNS) conditions. Substitution was obtained in the ortho or para position to the nitro group with acceptable to good yields and regioselectivity.
Einar J, Andreassen, Jan M, Bakke, Ingrid, Sletvold, Harald, Svensen   +3 more
openaire   +2 more sources

Simple Synthesis of Polyfunctional Nitropyridines

HETEROCYCLES, 1993
Upon treatment with nitroketene dithioacetal (2) in refluxing acetonitrile, enaminonitriles (1) afforded nitrodienamines (3). Polysubstituted nitropyridines (4 and 5) were obtained by cyclization of intermediates (3) with orthoformate and acetic anhydride ...
Cocco MT, CONGIU, CENZO, ONNIS, VALENTINA   +2 more
openaire   +1 more source

Nitropyridines. Part 1. Hantzsch Synthesis of Nitropyridines and Their Quaternary Salts.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
G. P. Sagitullina, L. V. Glizdinskaya, G. V. Sitnikov, R. S. Sagitullin   +3 more
openaire   +1 more source

Preparation of nitropyridines by nitration of pyridines with nitric acid

Organic and Biomolecular Chemistry, 2005
Nitration of pyridines 1a-o with nitric acid in trifluoroacetic anhydride, gave the corresponding 3-nitropyridines 6a-n in yields of 10-83%.
Eric F V Scriven, Suman Majumder, Novruz G Akhmedov   +2 more
exaly   +3 more sources

Nitropyridines, Their Synthesis and Reactions

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +1 more source

Nitropyridines: A Partnership of Technologies

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Rachel Lush, Paul McCarthy, Anthony Arber, Ross Millar   +3 more
openaire   +1 more source