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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TL;DR: In this paper, the 1,3-disulfonic acid imidazolium carboxylate ionic liquids [DSIM][X] were used as catalysts for the synthesis of 14H-dibenzo[a,j]xanthene and 1,8-dioxo-decahydroacridine derivatives in short times under solvent-free conditions at 80-100 °C with excellent yields.
Abstract: New members of 1,3-disulfonic acid imidazolium carboxylate ionic liquids [DSIM][X] (where X = [CH3COO]−, [CCl3COO]−, [CF3COO]−) were prepared and characterized by 1H NMR,13C NMR, FT-IR, TGA,UV-vis and elemental analysis. The more acidic ILs [DISM][CCl3COO] and [DSIM][CF3COO] were efficiently utilized as recyclable catalysts for the preparation of 14H-dibenzo[a,j]xanthene and 1,8-dioxo-decahydroacridine derivatives in short times under solvent-free conditions at 80–100 °C with excellent yields. The above two ILs could be effectively utilized as catalysts for the synthesis of 1,8-dioxo-decahydroacridine in water at the same temperature.
40 citations
TL;DR: In this paper, nano-ZnAl 2 O 4 was synthesized by blending metal-citrate complex-acrylamide polymer using the precursor method and powder X-ray diffraction analysis of the catalyst affirmed that the spinel oxide was phase pure.
Abstract: Nano-ZnAl 2 O 4 was synthesized by blending metal-citrate complex-acrylamide polymer using the precursor method. Powder X-ray diffraction analysis of the catalyst affirmed that the spinel oxide was phase pure. Elemental analysis was confirmed by Energy Dispersive X-ray analysis. Transmission Electron Microscopic (TEM) analysis and Scherrer's formula revealed that the particles were found to be in the order of 20 nm in size. Thermal stability of the catalyst was analyzed by thermogravimetric and differential thermal analysis (TG-DTA). Total acidity of the nano-ZnAl 2 O 4 evaluated by NH 3 -TPD was 8.8 mmol NH 3 /g. Diversity in the synthesis of xanthene derivatives was investigated using nanozinc aluminate as a catalyst. Nanoform of the catalyst showed better activity than the bulk form due to its large surface area 50 m 2 /g. The 2,2′-arylmethylene bis (3-hydroxy-2-cyclohexene-1-one), 2,2′-arylmethylene bis (3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) and 1-Oxo-hexahydroxanthenes were synthesized rapidly using ZnAl 2 O 4 and the catalyst was successfully recycled without any loss of activity.
40 citations
TL;DR: Sensitized-photocatalytic decomposition of 2,4-dichlorophenol using xanthene dyes as photosensitizer on TiO2 particles under visible light irradiation was studied in this article.
Abstract: Sensitized-photocatalytic decomposition of 2,4-dichlorophenol (2,4-DCP) using xanthene dyes as photosensitizer on TiO2 particles under visible light irradiation was studied. 2,4-DCP can be decomposed efficiently by this method and the decomposition efficiency of 2,4-DCP decreases in the following order: eosin Y ≈ rose bengal > erythrosine B > rhodamine B.
40 citations
TL;DR: In this paper, the fluorescence properties of the dye Rhodamine 590 and Rhodamine 640 intercalated into montmorillonite were studied, and it was shown that the amount of ethanol incorporated in the interlayer space of Montmorillonites determined the mesomeric structure of Rhodamine.
40 citations
12 Aug 2008
TL;DR: One-pot synthesis of aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxo-octahydroxanthene derivatives using montmorillonite K10 as reusable eco-friendly catalyst under solvent-free conditions is described in this article.
Abstract: One-pot synthesis of aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxo-octahydroxanthene derivatives using montmorillonite K10 as reusable eco-friendly catalyst under solvent-free conditions is described.
40 citations