Results 131 to 140 of about 976 (164)

1,6-Dihydro-1,2,4-triazines

J. Chem. Soc., Perkin Trans. 1, 1976
Synthetic pathways to reduced 1,2,4-triazines have been investigated. The most convenient route involved the reaction of ketones with sodium cyanide and thiosemicarbazide, under acidic conditions, to yield cyanothiosemi-carbazones. These compounds were either converted into the corresponding carboxy-thiosemicarbazones which, in turn, were cyclized in ...
Louis C. March, Khizar Wasti, Madeleine M. Joullié   +2 more
openaire   +1 more source

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
openaire   +1 more source

1,2,4-triazines and condensed derivatives—XIV

Tetrahedron, 1974
Abstract 3 - Alkylthio - 6,7 - dihydro - [1.2.4]triazino - [1.6-c]quinazolin - 5 - ium - 1 - olates (3), prepared by condensation of 3 - alkylthio -6-(2- aminophenyl) - 1,2,4 - triazin - 5(2H) - ones (1) with aldehydes, ketones or their equivalents are transformed by thermolysis and/or acid treatment into 3 - alkylthio - [1.2.4]triazino[5.6-b]indoles
G. Doleschall, K. Lempert
openaire   +1 more source

1,2,4-Triazines Are Versatile Bioorthogonal Reagents

Journal of the American Chemical Society, 2015
A new class of bioorthogonal reagents, 1,2,4-triazines, is described. These scaffolds are stable in biological media and capable of robust reactivity with trans-cyclooctene (TCO). The enhanced stability of the triazine scaffold enabled its direct use in recombinant protein production.
David N, Kamber, Yong, Liang, Robert J, Blizzard, Fang, Liu, Ryan A, Mehl, K N, Houk, Jennifer A, Prescher   +6 more
openaire   +2 more sources

Zur Chemie der 1,2,4‐Triazine, VII. Reaktionen von 1,2,4‐Triazin‐4‐oxiden

Justus Liebigs Annalen der Chemie, 1976
AbstractDie Hydrolyse von 1,2,4‐Triazin‐4‐oxiden 1 verlauft sowohl im sauren als auch im basischen Milieu unter Ringöffnung. Die Oxidation von 1 ergibt 5‐0xo‐1,2,4‐triazin‐4‐oxide 7 und/oder 1,2,4‐Triazin‐1,4‐dioxide 8. Bei der Reaktion von 1 mit Benzoylchlorid in Gegenwart von Wasser werden 1,2,4‐Triazin‐5‐one 5 gebildet.
Hans Neunhoeffer, Volker Böhnisch
openaire   +1 more source

ChemInform Abstract: 1,2,4‐Triazine. Part 4. Conversion of 1,2,4‐Triazine N4‐Oxides to Chloro‐ and Chloromethyl‐1,2,4‐triazines with POCl3.

ChemInform, 1993
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, H. C. KWON, H. G. KIM
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Reaction of 1,2,4-triazines with nitronate anions, direct nucleophilic acylation of 1,2,4-triazines.

Tetrahedron Letters, 1984
Abstract 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
openaire   +1 more source