Results 131 to 140 of about 2,492 (186)
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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 +3 more
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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 +3 more
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Journal of the Chemical Society, Faraday Transactions, 1991
Benzophenone has been used as a triplet energy donor to sensitize the production of the triplet state of the oxazine, 2,7-bis (diethylamino)-phenazoxonium chloride, in dilute acetonitrile solution. This enabled the spectrum, lifetime (14.5 µs) and absorption coefficient (1.6 × 104 dm3 mol–1 cm–1 at 830 nm) of the triplet oxazine to be determined.
Francis Wilkinson +4 more
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Benzophenone has been used as a triplet energy donor to sensitize the production of the triplet state of the oxazine, 2,7-bis (diethylamino)-phenazoxonium chloride, in dilute acetonitrile solution. This enabled the spectrum, lifetime (14.5 µs) and absorption coefficient (1.6 × 104 dm3 mol–1 cm–1 at 830 nm) of the triplet oxazine to be determined.
Francis Wilkinson +4 more
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New photochromic 2H-1.4-oxazines and spiro-2H-1.4-oxazines
Tetrahedron Letters, 1981Abstract 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 +2 more
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Formation of oxazine dye by photochemical reaction of N-acyl oxazine derivatives
Journal of Photochemistry and Photobiology A: Chemistry, 2007The 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 +2 more
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Identification of Neutrophils with an Oxazine Dye
American Journal of Clinical Pathology, 1987Used in an alkaline-buffered solution on fixed smears of bone marrow or peripheral blood, the oxazine dye CI basic blue 141 preferentially stained neutrophil granules a bright crimson red. In neutrophils, these granules were numerous, whereas in bands, only a few granules were seen.
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Australian Journal of Chemistry, 2017
A series of functionalized sesamol–oxazine and quinoline–oxazine hybrids have been synthesized via one-pot reaction of sesamol/6-hydroxyquinoline, aromatic amines, and methanal. The structures of all the novel compounds were confirmed by spectral data. The structures of the synthesized hybrids were also confirmed by X-ray crystallographic studies. Mild
Garima Khanna +2 more
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A series of functionalized sesamol–oxazine and quinoline–oxazine hybrids have been synthesized via one-pot reaction of sesamol/6-hydroxyquinoline, aromatic amines, and methanal. The structures of all the novel compounds were confirmed by spectral data. The structures of the synthesized hybrids were also confirmed by X-ray crystallographic studies. Mild
Garima Khanna +2 more
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Amplification of the Coloration Efficiency of Photochromic Oxazines
Advanced Materials, 2007In fact, their photoinduced transformations can beexploited to switch the color of liquid solutions, rigid polymermatrices or even crystals with optical inputs. Furthermore,these photoinduced processes are generally accompanied bysignificant structural modifications at the molecular level,which can translate into pronounced changes in the ...
Tomasulo M, SORTINO, Salvatore, Raymo FM
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Tuning the Activation Wavelength of Photochromic Oxazines
ChemPhysChem, 2016AbstractThe activation wavelength of a photochromic oxazine can be shifted bathochromically with the introduction of a methoxy substituent on the chromophore responsible for initiating the photochemical transformation. This structural modification permits switching under mild illumination conditions, enhances the photoisomerization quantum yield and ...
Subramani, Swaminathan +5 more
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Synthesis of Chiral Helical 1,3-Oxazines
Organic Letters, 2012A 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 +2 more
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Colorimetric Detection of Cyanide with a Chromogenic Oxazine
Organic Letters, 2005[reaction: see text] We have designed a chromogenic oxazine for the colorimetric detection of cyanide. Indeed, the [1,3]oxazine ring of our compound opens to form a 4-nitrophenylazophenolate chromophore in response to cyanide. This quantitative chromogenic transformation permits the detection of micromolar concentrations of cyanide in water ...
Massimiliano, Tomasulo +1 more
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