Results 181 to 190 of about 2,636 (208)
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From 3-chloromethyl-1,2,4-triazine 4-oxides to various substituted pyridines and 1,2,4-triazines
Russian Chemical Bulletin, 2005AbstractChemInform 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 +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, 1982AbstractDie 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, 1992Abstract 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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Reaction of 1,2,4-triazines with nitronate anions, direct nucleophilic acylation of 1,2,4-triazines.
Tetrahedron Letters, 1984Abstract Nitronate anions replace 5-hydrogen atom in a variety of 3-substituted 1,2,4-triazine derivatives giving oximes of 5-formyl and 5-acyl 1,2,4-triazines.
A. Rykowski, M. Mąkosza
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ChemInform Abstract: SYNTHESIS OF 1,2,4‐TRIAZINES, VIII. SYNTHESIS OF 1,2,4‐TRIAZINE 4‐OXIDES
Chemischer Informationsdienst, 1978AbstractDie 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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1,2,4‐triazines. III. A convenient synthesis of 1,2,4‐triazines and their covalent hydration
Journal of Heterocyclic Chemistry, 1970AbstractA general synthesis of 1,2,4‐triazines, from 3‐methylthiotriazines is described. It has been shown that 1,2,4‐triazines undergo covalent hydration across the N4‐C5 bond.
William W. Paudler, Teh‐Kuei Chen
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ChemInform, 1997
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.
J.‐K. LEE +3 more
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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.
J.‐K. LEE +3 more
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ChemInform Abstract: CHEMISTRY OF 1,2,4‐TRIAZINES, VII. REACTIONS OF 1,2,4‐TRIAZINE 4‐OXIDES
Chemischer Informationsdienst, 1976AbstractDie Hydrolyse der Triazin‐N‐oxide (I) verläuft unter Ringöffnung zu den Hydraziden (II), und zwar in alkalischer Lösung leichter, als in saurer.
HANS NEUNHOEFFER, VOLKER BOEHNISCH
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Journal für Praktische Chemie, 1987
Synthesis of New Substituted as‐Triazine‐6‐carboxylic Acids and as‐Triazine‐6‐yl‐alkanoic AcidsNew substituted 3‐amino‐, 5‐amino‐ and 3,5‐diamino‐as‐triazine‐6‐carboxylic acids 4a, b, 5a, b and 6 were obtained by the hydrolysis 6‐azalumazine derivatives 3a–e.
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Synthesis of New Substituted as‐Triazine‐6‐carboxylic Acids and as‐Triazine‐6‐yl‐alkanoic AcidsNew substituted 3‐amino‐, 5‐amino‐ and 3,5‐diamino‐as‐triazine‐6‐carboxylic acids 4a, b, 5a, b and 6 were obtained by the hydrolysis 6‐azalumazine derivatives 3a–e.
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Nucleophilic substitution of 1,2,4‐triazines
Journal of Heterocyclic Chemistry, 1985AbstractThe 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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