Results 131 to 140 of about 2,785 (181)

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

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
openaire   +1 more source

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
openaire   +1 more source

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
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

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.
openaire   +1 more source

ChemInform Abstract: CHEMISTRY OF 1,2,4‐TRIAZINES, VII. REACTIONS OF 1,2,4‐TRIAZINE 4‐OXIDES

Chemischer Informationsdienst, 1976
AbstractDie 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
openaire   +1 more source

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 ...
openaire   +1 more source

1,2,4-Triazines. IV. Synthesis and characterization of 1,2,4-triazine N-oxides

The Journal of Organic Chemistry, 1971
William W. Paudler, Teh-Kuei Chen
openaire   +1 more source

Metal-organic materials with triazine-based ligands: From structures to properties and applications

Coordination Chemistry Reviews, 2021
Mei-Hui Yu, Xiao-Ting Liu, Brian Space   +2 more
exaly