Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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Patent•
08 Aug 2012
TL;DR: In this paper, a novel xanthene oxadiazole compound I, which is a derivative of rhodamine 6 G dye, has been described, which has good water solubility, fluorescence and the application of cell fluorescent stain.
Abstract: The invention discloses a novel xanthene oxadiazole compound I, which is a derivative of rhodamine 6 G dye. In the compound I, the positions of 2- and 5- of a 1,3,4-oxadiazole ring are respectively substituted by methyl phenyl and rhodamine 6 G. The compound has good water solubility, fluorescence and the application of cell fluorescent stain.
TL;DR: A green protocol for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-ones using guanidine hydrochloride as an organocatalyst under solvent-free conditions is presented in this article.
Abstract: A new green protocol has been developed for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-ones using guanidine hydrochloride as an organocatalyst under solvent-free conditions. Operational simplicity, mild reaction conditions, enhanced rates, high isolated yields of the pure products, and purification of products by nonchromatographic methods are significant advantages of the protocol presented here.
Patent•
02 Feb 1994
TL;DR: Water-soluble fiber-reactive dyes are highly suitable for the dyeing of carboxamido-containing and/or hydroxyl-containing materials, such as, for example, synthetic polyamide fiber materials, wool and in particular cellulose fiber materials with a high degree of fixation in hues which have a high color strength and good fastness properties as discussed by the authors.
Abstract: Water-soluble fiber-reactive azo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylemthane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dyes which contain once or twice the group of the general formula in which: Rx and Rz are, independently of one another, hydrogen or lower alkyl, which can be substituted by halogen, hydroxyl, cyano, lower alkoxy, lower alkoxycarbonyl, carboxyl, sulfamoyl, sulfo or sulfato; W is fluorine, chlorine, bromine, sulfo, phenylsulfonyl or alkylsulfonyl of 1 to 4 carbon atoms; Y is vinyl, beta -substituted, beta -thiosulfatoethyl, beta -phosphatoethyl, beta -alkanoyloxyethyl of 2 to 5 carbon atoms in the alkanoyl radical, beta -benozoyloxyethyl, beta -(sulfobenzoyloxy)ethyl, beta -(p-toluenesulfonyloxy)ethyl or beta -halogenoethyl. The fiber-reactive dyes are highly suitable for the dyeing of carboxamido-containing and/or hydroxyl-containing materials, such as, for example, synthetic polyamide fiber materials, wool and in particular cellulose fiber materials with a high degree of fixation in hues which have a high color strength and good fastness properties.
TL;DR: In this paper, the synthesis of new xanthene intermediates and derived near-infrared absorbing pyrylium trimethinecyanine dyes is described and the structure of the compounds was confirmed by elemental analysis, electronic absorbtion spectra and in some cases by IR and 1 H-NMR spectroscopy.
Abstract: The synthesis of some new xanthene intermediates and derived near-infrared absorbing pyrylium trimethinecyanine dyes is described. The dyes absorb in the region from 700 to 860 nm. The structure of the compounds was confirmed by elemental analysis, electronic absorbtion spectra and in some cases by IR and 1 H-NMR spectroscopy.
TL;DR: In this paper, a simple, efficient, and green method for the synthesis of the title compounds (IV and VI) was developed using HClO4-SiO2 as catalyst in appropriate three-component reactions under solvent-free conditions.
Abstract: A simple, efficient, and green method for the synthesis of the title compounds (IV) and (VII), resp., is developed using HClO4-SiO2 as catalyst in appropriate three-component reactions under solvent-free conditions.