Results 131 to 140 of about 45,356 (184)

From 3-chloromethyl-1,2,4-triazine 4-oxides to various substituted pyridines and 1,2,4-triazines

Russian Chemical Bulletin, 2005
AbstractChemInform 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.
V. N. Kozhevnikov, D. N. Kozhevnikov, O. V. Shabunina, N. N. Kataeva, S. A. Yushchuk, V. L. Rusinov, O. N. Chupakhin   +6 more
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ChemInform Abstract: SYNTHESIS OF 1,2,4‐TRIAZINES. IX. SYNTHESIS OF CYCLOPENTA(E)‐1,2,4‐TRIAZINES

Chemischer Informationsdienst, 1982
AbstractDie Vertreter (IV), (XI), (XII) und (XIII) des bisher unbekannten Titel‐Systems werden durch Kondensation der entsprechenden Diole (I) mit den Amidrazonen (II), (VI) [oder (VII)], (VII) bzw. (IX) dargestellt, wobei die Richtung der Reaktion von (V) lösungsmittelabhängig ist [eine Umlagerung von (VII) in (VI) erfolgt in ammoniakalischem Methanol]
H.‐J. METZ, H. NEUNHOEFFER
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Synthesis of 1,2,4-triazines - XIV. Regioselective synthesis of ethyl 1,2,4-triazine-5-carboxylates

Tetrahedron, 1992
Abstract Ethyl 1,2,4-triazine-5-carboxylates 6 were prepared by heating N,N-dimethylaminomethylene- or ethoxymethylenehydrazones 5 with ammonium acetate in acetic acid at 100°C. NMR studies confirmed the absence of their regio isomers (6-carboxylates), showing the high regioselectivity of this procedure.
Tadashi Ohsumi, Hans Neunhoeffer
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ChemInform Abstract: SYNTHESIS OF 1,2,4‐TRIAZINES, VIII. SYNTHESIS OF 1,2,4‐TRIAZINE 4‐OXIDES

Chemischer Informationsdienst, 1978
AbstractDie aus den Hydrazono‐oximen (I) und den Orthocarbonsäureestern (II) erhältlichen Esterhydrazone (III) werden beim Erhitzen in Benzonitril (200°C) zu den Triazinoxiden (IV) cyclisiert.
V. BOEHNISCH, G. BURZER, H. NEUNHOEFFER
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Preparation of new 1,2,4‐triazines

Journal of Heterocyclic Chemistry, 1982
AbstractSeveral 1,2,4‐triazines were synthesized. 13C‐ and 15N‐nmr spectroscopy was employed for structure determination.
Oljan Repič, P. G. Mattner, M. J. Shapiro   +2 more
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Merocyaninfarbstoffe aus 1,2,4-Triazin

Monatshefte für Chemie, 1968
Hydrazinderivate von 1,2,4-Triazinen liefern mit Acetessigester Pyrazolonderivate. Diese kondensieren sich mit Salzen quartarer heterocyclischer Basen zu Merocyaninfarbstoffen. Darstellung und Spektren von drei Typen solcher Farbstoffe werden beschrieben.
Engelbert Kiša, Jaromír Hadáček
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Kondensierte Dihydro‐1,2,4‐triazine

Archiv der Pharmazie, 1987
AbstractHydrazone von α‐Aminoketonen mit cyclischem Aminanteil ergeben mit Quecksilber (II)‐EDTA eine Cyclodehydrierung zu entspr. kondensierten Dihydrotriazinen.
Hans Möhrle, Peter Schillings
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Condensed 1,2,4‐Triazines, III

Archiv der Pharmazie, 1980
AbstractAlkylation of 3‐mercaptophenanthreno[9,10‐e]‐1,2,4‐triazine (1b) yielded the S‐alkyl derivatives 2 a‐d. Amination of 1a afforded the 3‐amino derivatives 3a‐h. Reaction of 1a with hydrazine hydrate gave 3‐hydrazinophenanthreno[9,10‐e]‐1,2,4‐triazine (4) which underwent cyclisation with nitrous, formic or acetic acids giving the phenanthreno[9,10‐
Vishnu Ji Ram, Hrishi Kesh Pandey
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ChemInform Abstract: 1,2,4‐TRIAZINES. SYNTHESIS OF SELECTED MEMBERS OF THE S‐TRIAZOLO(3,4‐F)(1,2,4)TRIAZINE AND TETRAZOLO(1,5‐F)(1,2,4)TRIAZINE

Chemischer Informationsdienst, 1979
Abstract3‐Amino‐l ,2,4‐triazin (I) liefert bei der Oxidation das Triazinon (IIa), das zu (IIb) bromiert wird und die Austauschprodukte (IIc) und (IId) gibt.
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Nucleophilic substitution of 1,2,4‐triazines

Journal of Heterocyclic Chemistry, 1985
AbstractThe reaction of 3‐(methylthio)‐5‐carbethoxy‐1,2,4‐triazine (5) with ammonia was found to yield products from not only ammonia but also methanethiolate displacements. An account of the transformations and the products observed is given. The 3‐position of 3,6‐bis(methylthio)‐5‐carbamoyl‐1,2,4‐triazine (7) was shown to be more reactive than the 6 ...
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