Results 141 to 150 of about 8,948 (229)
Some of the next articles are maybe not open access.
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 +3 more
openaire +2 more sources
Journal of the American Chemical Society, 2019
Poly(2-oxazoline)s and, more recently, also poly(2-oxazine)s represent an emerging class of polymers with a broad range of applications. Surprisingly, to date, the statistical copolymerization of these two cyclic imino ether monomers has not yet been ...
O. Sedláček +5 more
semanticscholar +1 more source
Poly(2-oxazoline)s and, more recently, also poly(2-oxazine)s represent an emerging class of polymers with a broad range of applications. Surprisingly, to date, the statistical copolymerization of these two cyclic imino ether monomers has not yet been ...
O. Sedláček +5 more
semanticscholar +1 more source
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
openaire +2 more sources
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
openaire +2 more sources
Chinese journal of chemistry
We described a Yb(OTf)3 combined with Pybox ligand catalyzed asymmetric [3+3] cycloaddition of N‐vinyl cinnamaldehyde nitrones with activated cyclopropanes to prepare various functionalized 1,2‐oxazines in 24%—95% yields and 22%—96% ee.
Yu‐Zheng Wu +6 more
semanticscholar +1 more source
We described a Yb(OTf)3 combined with Pybox ligand catalyzed asymmetric [3+3] cycloaddition of N‐vinyl cinnamaldehyde nitrones with activated cyclopropanes to prepare various functionalized 1,2‐oxazines in 24%—95% yields and 22%—96% ee.
Yu‐Zheng Wu +6 more
semanticscholar +1 more source
Combining naphthoxazines and benzoxazines for non-symmetric curable oxazines by one-pot synthesis
, 2019Herewith, we report a novel approach to combine two structurally diverse oxazines, namely benzoxazine and naphthoxazine, on a same molecule by one-pot two step approach.
F. S. Gungor, Bige Batı, B. Kiskan
semanticscholar +1 more source
Chemistry, 2018
Few natural oxindole alkaloids possess an exceptional spiro-[(1,3)oxazinan-3,6'-oxindole] core structure, which results from an unusual oxidative indole rearrangement.
Thorsten von Drathen +2 more
semanticscholar +1 more source
Few natural oxindole alkaloids possess an exceptional spiro-[(1,3)oxazinan-3,6'-oxindole] core structure, which results from an unusual oxidative indole rearrangement.
Thorsten von Drathen +2 more
semanticscholar +1 more source
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 +4 more
openaire +2 more sources
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 +4 more
openaire +2 more sources
A Review on Current Synthetic Strategies of Oxazines
Mini-Reviews in Organic Chemistry, 2018In the past three decades, the heterocyclic oxazine cores have been intensely concerned. Oxazine derivatives are promising vital heterocyclic motifs. They are eminent for their synthetic potential and extensive biological properties.
S. Gaonkar +2 more
semanticscholar +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source