Results 171 to 180 of about 5,225 (230)

Chromogenic Oxazines for Cyanide Detection

The Journal of Organic Chemistry, 2005
[reaction: see text] We have designed two heterocyclic compounds for the colorimetric detection of cyanide. The skeleton of both molecules fuses a benzooxazine ring to an indoline fragment and can be assembled efficiently in three synthetic steps starting from commercial precursors.
Tomasulo M, SORTINO, Salvatore, White AJP, Raymo FM   +3 more
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1,3-Oxazine Derivatives

1963
Publisher Summary This chapter discusses the methods of preparation and chemical properties of 1,3-oxazine derivatives. One of the derivatives discussed is tetrahydro-1,3-oxazines. The methods employed for the preparation of tetrahydro-1,3-oxazines include cyclization, hydrogenation, or other addition to the double bond of unsaturated 1,3-oxazines ...
Z, ECKSTEIN, T, URBANSKI
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Fluorescence activation with switchable oxazines

Chemical Communications, 2018
Activatable fluorophores allow the spatiotemporal control of fluorescence required to acquire subdiffraction images, highlight cancer cells and monitor dynamic ...
Yang Zhang, Sicheng Tang, Ek Raj Thapaliya, Lorenzo Sansalone, Françisco M. Raymo   +4 more
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Neuartige Oxazin‐Synthese

Chemische Berichte, 1980
New Oxazine SynthesisThe dialkylcyanamides 2 react with derivatives of o‐chloro‐carboxylic acids 1 and 5a,b to give benzoxazine 3 and the benzothieno‐oxazines 6 and 7. The chloride 5c reacts with 2 to form the carbimidoyl chlorides 8.
Walter Ried, Gerhard Oremek, Roman Guryn, Hanns‐Eberhard Erle   +3 more
openaire   +1 more source

New photochromic 2H-1.4-oxazines and spiro-2H-1.4-oxazines

Tetrahedron Letters, 1981
Abstract The synthesis and the photochemical behaviour of 4 new 2H-1.4-oxazines and 3 new spiro-2H-1.4-oxazines is described.
Ulrich-W. Grummt, Manfred Reichenbächer, Roland Paetzold   +2 more
openaire   +1 more source

Oxazine 170 Induces DNA:RNA:DNA Triplex Formation

Journal of Medicinal Chemistry, 2005
The oxazine dye (Oxazine 170) was found to induce formation of a hybrid triplex structure, poly rA:(poly dT)(2), under solution conditions in which the triplex would not otherwise form. Formation of the hybrid triplex is driven by the structural selective binding of oxazine 170 to poly rA:(poly dT)(2).
Guangtao, Song, Feifei, Xing, Xiaogang, Qu, Jonathan B, Chaires, Jinsong, Ren   +4 more
openaire   +2 more sources

Formation of oxazine dye by photochemical reaction of N-acyl oxazine derivatives

Journal of Photochemistry and Photobiology A: Chemistry, 2007
The synthesis and photochemical reaction mechanism of N-benzoyl oxazine derivatives have been investigated. The synthesized materials were found to be photosensitive and capable of generating oxazine dye upon light irradiation. The initial reactions were found to include homolytic bond cleavage between the oxazine nitrogen and benzoyl carbon atoms ...
Masaharu Akiba, Alexander S. Dvornikov, Peter M. Rentzepis   +2 more
openaire   +1 more source

Synthesis of Chiral Helical 1,3-Oxazines

Organic Letters, 2012
A series of novel 1,3-oxazines were prepared to construct a helical framework. The 1,3-oxazine attached to the phenanthrene unit showed a small bite angle θ (∼12°), while the units attached to [4]helicene showed a larger θ (∼35°) and exhibited helical isomers at ambient conditions.
Harish R, Talele, Sibaprasad, Sahoo, Ashutosh V, Bedekar   +2 more
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Insights into the isomerization of photochromic oxazines from the excitation dynamics of BODIPY–oxazine dyads

Physical Chemistry Chemical Physics, 2012
We synthesized five BODIPY-oxazine dyads in one to four synthetic steps from known precursors. They differ in the nature of the unsaturated spacer linking the oxazine photochrome to either the conjugated framework or the boron center of the BODIPY fluorophore.
Deniz E, Battal M, Cusido J, SORTINO, Salvatore, Raymo FM   +4 more
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ChemInform Abstract: DIHYDRO‐1,3‐OXAZINE 12. MITT. DIE OXAZIN‐ALPHA‐CARBANION‐KETENIMIN‐UMLAGERUNG

Chemischer Informationsdienst. Organische Chemie, 1971
AbstractDie beiden Dihydro‐1,3‐oxazine (Ia) und (Ib) reagieren mit Butyllithium/Amyljodid zu den Substitutionsprodukten (IIa) und (IIb) die durch Natriumboranat zu den Aldehyden (IIIa) und (IIIb) reduktiv gespalten werden.
A. I. MYERS, E. M. SMITH
openaire   +1 more source