Results 171 to 180 of about 2,636 (208)
Some of the next articles are maybe not open access.
Chemistry of 1,2,4‐triazines, XV. First metalation of 1,2,4‐triazine derivatives
Liebigs Annalen der Chemie, 1993Abstract5‐Methoxy‐1,2,4‐triazines 2 were lithiated with lithium 2,2,6,6‐tetramethylpiperidide and the formed 6‐lithio‐5‐methoxy‐1,2,4‐triazines 4 trapped with aldehydes or iodine.
Nelly Plé +4 more
openaire +1 more source
2001
[290-38-0] C3H3N3 (MW 81.09) InChI = 1S/C3H3N3/c1-2-5-6-3-4-1/h1-3H InChIKey = FYADHXFMURLYQI-UHFFFAOYSA-N (electron-deficient heteroaromatic azadiene capable of participation in inverse electron demand Diels–Alder reactions with electron-rich dienophiles1) Alternate Names: as-triazine; α-triazine; isotriazine ...
Dale L. Boger, Minsheng Zhang
openaire +1 more source
[290-38-0] C3H3N3 (MW 81.09) InChI = 1S/C3H3N3/c1-2-5-6-3-4-1/h1-3H InChIKey = FYADHXFMURLYQI-UHFFFAOYSA-N (electron-deficient heteroaromatic azadiene capable of participation in inverse electron demand Diels–Alder reactions with electron-rich dienophiles1) Alternate Names: as-triazine; α-triazine; isotriazine ...
Dale L. Boger, Minsheng Zhang
openaire +1 more source
Condensed 1,2,4‐Triazines, III
Archiv der Pharmazie, 1980AbstractAlkylation 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
openaire +1 more source
Kondensierte Dihydro‐1,2,4‐triazine
Archiv der Pharmazie, 1987AbstractHydrazone von α‐Aminoketonen mit cyclischem Aminanteil ergeben mit Quecksilber (II)‐EDTA eine Cyclodehydrierung zu entspr. kondensierten Dihydrotriazinen.
Hans Möhrle, Peter Schillings
openaire +1 more source
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 +2 more
openaire +1 more source
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 +2 more
openaire +1 more source
Merocyaninfarbstoffe aus 1,2,4-Triazin
Monatshefte für Chemie, 1968Hydrazinderivate 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, 1974Abstract 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, 2015A 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 +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, 1976AbstractDie 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, 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
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