- Synthesis of unsymmetrical 4-oxo-2-vinyl-4H-chromene-3-carbonitrile dyes via Knoevenagel reaction
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New 4-oxo-2-vinyl-4H-chromene-3-carbonitrile derivatives have been synthesized by the Knoevenagel reaction of 2-methyl-4-oxo-4H-chromene-3-carbonitrile with aromatic and heteroaromatic aldehydes. Spectral properties of the obtained compounds have been studied.
- Levchenko,Chudov,Zinoviev,Lyssenko,Demin,Poroshin,Shmelin,Grebennikov
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p. 2788 - 2792
(2018/06/08)
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- Synthesis of Aminobenzopyranoxanthenes with Nitrogen-Containing Fused Rings
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An efficient and practical method for the synthesis of a variety of aminobenzopyranoxanthenes (ABPXs) with different nitrogen-containing fused rings was developed. On the basis of the mechanistic studies of the formation of the xanthene framework, the presented methodology was developed to facilitate access to previously inaccessible asymmetric ABPXs.
- Fukino, Natsumi,Kamino, Shinichiro,Takahashi, Minami,Sawada, Daisuke
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p. 13626 - 13631
(2017/12/26)
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- 3,6-DISUBSTITUTED XANTHYLIUM SALTS
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This invention pertains generally to processes, uses, methods and materials utilising particular xanthylium compounds, including compounds of formula (I) and (II), as further defined herein. These compounds are useful as drugs, for example, in the treatment of tauopathies, such as Alzheimer's disease.
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Page/Page column 87
(2010/07/02)
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- Thermally stable nonlinear optical polymers based on polyimides substituted with chromophores containing julolidine moiety
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We designed and synthesized a NLO chromophore adopting the concept of shape modification as well as possessing high thermal stability. The chromophore was featured by a phenylene ring as a conjugation bridge, a bulky alkyl chain attached on the side of the conjugation bridge, and julolidine moiety as an electron donor. The NLO chromophore was attached to the polyimide as a side chain, resulting in thermally durable NLO polymers. On set decomposition temperature of the NLO chromophore was measured 330°C in TGA analysis. The NLO polymer exhibited high glass transition temperature of 150°C and was thermally stable up to 250°C. The polymer was quite soluble in common solvents and produced an optical quality film by spin-coating. The electro-optic coefficient of the film was measured using 1.55 μm laser source, giving as high as 30 pm/V at the poling condition of 150°C and 1 MV/cm.
- Ju, Hyun Kyung,Lim, Jong Sun,Lee, Changjin,Choi, Dong Hoon,Kim, Dong Wook
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experimental part
p. 152 - 163
(2010/04/06)
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- Synthesis of 5- and 6-carboxy-x-rhodamines
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(Equation Presented) An efficient route is reported to 5- and 6-carboxy-X-rhodamines (compounds 1 and 2) that contain multiple n-propylene or y,y-dimethylpropylene groups bridging terminal nitrogen atoms and the central xanthene core. Gram quantities of these dyes are synthesized from inexpensive starting materials. The isolated products are activated by selective transformation of the carboxylic acid group into N-hydroxysuccinimidyl esters in situ and then conjugated with an amino group of a molecule of interest.
- Uddin, Md Jashim,Marnett, Lawrence J.
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supporting information; experimental part
p. 4799 - 4801
(2009/05/31)
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- Benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation
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Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation are disclosed.
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