Results 91 to 100 of about 360 (144)

Synthesis of 4H-1,3-benzoxazin-4-onium salts and 4-H-1,3-benzoxazin-4-ones

Chemistry of Heterocyclic Compounds, 1975
Salicylamide and its substituted derivatives react with aliphatic carboxylic acid anhydrides and perchloric acid to give 4H-1,3-benzoxazin-4-onium salts. These same compounds were obtained by acidic cyclization of O- and N-acylsalicylamides. The synthesized salts are converted to 2-substituted 4H-1,3-benzoxazin-4-ones by the action of triethylamine and
Yu. I. Ryabukhin, G. N. Dorofeenko, V. V. Mezheritskii   +2 more
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ChemInform Abstract: STUDIES ON 1,3‐BENZOXAZINES. IV. REACTION OF IMIDOYL CHLORIDES OF 1,3‐BENZOXAZINES WITH SULFOXIDES

Chemischer Informationsdienst, 1981
AbstractDas Chlorbenzoxazin (I) reagiert bei Raumtemperatur mit Dimethylsulfoxid zu einem Gemisch der Verbindungen (II)‐(IV).
R. TACHIKAWA, K. WACHI, A. TERADA
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Pharmacological properties of some derivatives of 1,3-benzoxazine

Experientia, 1968
Sono stati studiati 22 derivati della 1,3-benzossazina, 8 dei quali sono risultati attivi sulla depressione da reserpina. Tra essi il piu efficace e stato il 4H-3-carbossamidometil-1,3-benzossazin-2-one. Correlando la struttura chimica all'attivita farmacologica si e visto che la distanza del gruppo amidico dall'anello benzossazinico, la linearita ...
L, Bernardi, S, Coda, L, Pegrassi, G K, Suchowsky   +3 more
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ChemInform Abstract: SYNTHESIS OF 4H‐1,3‐BENZOXAZIN‐4‐ONIUM SALTS AND OF 4H‐1,3‐BENZOXAZINE‐4‐ONES

Chemischer Informationsdienst, 1975
AbstractDie Salicylamide (I) cyclisieren mit den Carbonsäureanhydriden (II) in Gegenwart von 70%iger Perchlorsäure zu Benzoxazinoniumsalzen (III), die mit Triäthylamin die Benzoxazinone (IV) ergeben und mit Wasser zu den N‐Acylsalicylamiden (V) hydrolysieren.
YU. I. RYABUKHIN, V. V. MEZHERITSKII, G. N. DOROFEENKO   +2 more
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A One‐Pot Synthesis of 1,3‐Benzoxazines.

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
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Synthesis of substituted 1,3-benzoxazin-4-ones

Chemistry of Heterocyclic Compounds, 1983
The heterocyclization of 2-hydroxybenzoic acid anilides with acetylene in the presence of a catalyzing mixture of potassium hydroxide with cadmium oxide or cadmium acetate alone gives o-, m-, and p-vinyloxy-substituted 1,3-benzoxazin-4-ones.
G. G. Skvortsova, Z. V. Stepanova, L. V. Andriyankova, V. K. Voronov   +3 more
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Polyaddition of bifunctional 1,3‐benzoxazine and 2‐methylresorcinol

Journal of Polymer Science Part A: Polymer Chemistry, 2013
ABSTRACT:A polyaddition system consisted of a bifunctional N‐n‐propyl benzoxazine and 2‐methylresorcinol (MR) that proceeds at ambient temperature has been developed. In this system, the aromatic ring of MR acted as a bifunctional monomer, reacting with a two equivalent amount of benzoxazine moieties via their ring‐opening reaction.
Hiroaki Oie, Atsushi Mori, Atsushi Sudo, Takeshi Endo   +3 more
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ChemInform Abstract: DIE SYNTHESE VON 4H‐1,3‐BENZOXAZIN‐4‐ONIUMSALZEN UND 4H‐1,3‐BENZOXAZIN‐4‐ONEN

Chemischer Informationsdienst, 1975
AbstractSalicylamid (I) reagiert mit den Carbonsäureanhydriden (II) in Gegenwart von Perchlorsäure über die Zwischenstufe (III) zu den Benzoxazinoniumsalzen (IV), die bei Behandlung mit tertiären Basen in die Benzoxazinone (V) übergehen und aus ihnen auch mit Perchlorsäure wieder entstehen.
YU. I. RYABUKHIN, G. N. DOROFEENKO, V. V. MEZHERITSKII   +2 more
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Reaction of 2,3,5,10b-tetrahydrooxazolo[3,2-c][1,3]benzoxazines with chlorotrimethylsilane

Russian Journal of Organic Chemistry, 2006
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.
B. F. Kukharev, V. K. Stankevich, G. R. Klimenko, V. V. Bayandin, V. A. Kukhareva   +4 more
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Insight into the Mechanism of Reversible Ring-Opening of 1,3-Benzoxazine with Thiols

The Journal of Organic Chemistry, 2017
The reversible ring-opening addition and fragmentation reaction of p-cresol-based N-phenylbenzoxazine with aliphatic and aromatic thiols was investigated in solvent-mediated and solvent-free reactions. Independently of the used thiol, N-phenylbenzoxazine and the thiols reacted to equilibrium with comparable amounts of reactants and products in aprotic ...
Tobias Urbaniak, Marc Soto, Manuel Liebeke, Katharina Koschek   +3 more
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