Results 81 to 90 of about 2,940 (138)

Pyridazines

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
N. Haider, W. Holzer
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Vibrational spectra of pyridazine, pyridazine-d4, pyridazine-3,6-d2 and pyridazine-4,5-d2

Spectrochimica Acta Part A: Molecular Spectroscopy, 1967
Abstract Infrared spectra of the liquids pyridazine, pyridazine- d 4 and pyridazine-3,6- d 2 are reported from 270 to 4,000 cm −1 . Raman spectra are reported for these liquids with the state of polarization for many lines. The vibrational assignment suggested for these three compounds satisfies the three Teller—Redlich product rules within ...
H.D. Stidham, J.V. Tucci
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Pyridazines. III. The synthesis of substituted pyridazines

Journal of Heterocyclic Chemistry, 1965
AbstractA series of pyridazines and pyridazones have been prepared substituted with alkyl, alkoxyl, halogen, mercapto, substituted mercapto, phenyl, morpholino, piperidino, styryl, substituted styryl and pyridylethenyl groups as potential antitumor agents. The compounds possessing antitumor or tissue culture activity are recorded in Table VI.
Raymond N. Castle, Kenji Kaji
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SYNTHESIS OF NEW PYRIDAZIN- 6-ONES, PYRIDAZIN-6-IMINES, 4-PYRIDAZINALS, AND PYRIDINES

Synthetic Communications, 2002
ABSTRACT 3-Dimethyl-1-[3-methyl-(4H)-5-phenylimidazol[2,1-b]thiazol-2-yl]prop-2-enone 4 couples smoothly with benzenediazonium chloride to yield propanal 5 which is a key intermediate for the synthesis of pyridazinones 9–13, 16 and pyridazine-6-imine 8, 19.
Samia M. Sayed, Mohamed A. Khalil, Maghraby A. Ahmed, Mohamed A. Raslan   +3 more
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ChemInform Abstract: Synthesis of Pyridazine and Fused Pyridazine.

ChemInform, 1995
AbstractChemInform 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.
M. G. ASSY, E. A. EL‐GHANI
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Pyridazines. XXIII. A novel pyridazine into pyrazole ring transformation

Journal of Heterocyclic Chemistry, 1984
AbstractTreatment of phenyl(4‐pyridazinyl)methanols 1a and 1b with p‐toluenesulfonic acid at elevated temperatures causes transformation into the C‐4 substituted pyrazole derivatives 8a and 8b. Limitations of this novel rearrangement reaction as well as mechanistic considerations are discussed.
Gottfried Heinisch, Richard Waglechner
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Pyridazines. LXXXIV. Studies on borohydride reduction of pyridazine compounds

Journal of Heterocyclic Chemistry, 1976
AbstractImidazo[1,2‐b]pyridazine, s‐triazolo[4,3‐b]pyridazine and tetrazolo[1,5‐b]pyridazine and some derivatives thereof were reduced with sodium borohydride to give the corresponding 5,6,7,8‐tetrahydro derivatives. A mechanism for these reductions is proposed and reduction at the C7‐C8 bond occurs before the reduction of the C6N5 bond.
P. K. Kadaba, B. Stanovnik, M. Tišler
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Pyridazines. XLVI. Ring Opening of Some Azolo and Azino Pyridazines

Synthetic Communications, 1971
Abstract A facile cleavage of the five-membered ring of certain quaternary s-triazolo (4, 3-b)pyridazines under basic conditions was recorded recently2. We report now several interesting cases of the six-membered ring opening in some related systems under similar conditions.
A. Pollak, B. Stanovnik, M. Tišler
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Iptycene-Derived Pyridazines and Phthalazines

The Journal of Organic Chemistry, 2007
The synthesis of new heterocyclic oligo(phenylene) analogues based on soluble, nonaggregating 1,2-diazines is reported. Improved palladium-catalyzed reductive coupling methods were developed to allow for the preparation of large quantities of iptycene-derived bipyridazines and biphthalazines, and the controlled synthesis of well-defined oligomers up to
Jean, Bouffard, Robert F, Eaton, Peter, Müller, Timothy M, Swager   +3 more
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[Biotransformation of pyridazines. 1. Pyridazine and 3-methylpyridazine].

Die Pharmazie, 1990
Pyridazin (1) and 3-methylpyridazine (6) undergo oxidative biotransformation in an unexpected high degree. Beside the unchanged compounds, after administration of 1 two isomeric monohydroxylated products (2, 3), 4,5-dihydrodihydroxypyridazine (4) and 4,5-dihydroxypyridazine (5) and after administration of 6 one ringhydroxylated 6-derivative (7), 3 ...
H H, Borchert, S, Pfeifer, B, Helbig, P, Franke, G, Heinisch   +4 more
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