- One-pot synthesis of N, N, N, N-tetraethyl-9H-xanthene-3,6-diamine and its conversion to pyronine B
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N, N, N, N-tetraethyl-9H-xanthene-3,6-diamine (9H-xanthene) was prepared by one-pot reaction of 3-diethylaminophenol with (CH3O)3CH using pyridinium para-toluenesulfonate (PPTS) as catalyst. It was found that 9H-xanthene is photo-active and could be efficiently photo-converted to pyronine B. Treatment of 9H-xanthene with acid (HCl) produced protonated 9H-xanthene (9H-xanthene·HCl), and 9H-xanthene·HCl was spontaneously converted to pyronine B in aqueous solution. Besides, both distinct color change and turn on fluorescence were observed during the conversion. These findings not only provide a new and simple approach to the preparation of 9H-xanthene and pyronine B but also benefit the applications such as indicator and probe.
- Han, Shulei,Chen, Yi
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- Nerve agents and the like of the detection reagent and method
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The invention relates to a reagent and a method for detecting a nerve agent and analogues thereof, and in particular relates to compounds of formulae I and II in the specification, a detection composition or polymer film containing the compounds, a detection kit containing the composition or polymer film, a preparation method of the compounds and a method for detecting sarin and dangerous substances related with sarin, wherein the definitions of the groups in the formulae I and II are as described in the specification.
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Paragraph 0082; 0155-0159
(2018/10/26)
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- A concise colorimetric and fluorimetric probe for sarin related threats designed via the covalent-assembly approach
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A turn-on signal from zero background allows sensitive detection of a weak signal and is highly desired. The covalent-assembly probe design principle is powerful in this regard. Herein, we report an embodiment of this principle (NA570) for detection of Sa
- Lei, Zuhai,Yang, Youjun
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p. 6594 - 6597
(2014/05/20)
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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 65
(2010/07/02)
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