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.

A Simple Route to Benzo[b]xanthene-6,11,12-triones: Synthesis of Bikaverin

Abstract: A three-step procedure for the synthesis of 1H-benzo[b]xanthene-6,11,12-trione derivatives is described The procedure involves the halogenation of 12-(3-hydroxy-1,4-naphthoquinon-2-yl)-6H-benzo[b]xanthene-6,11-(12H)-diones, followed by treatment with water under aeration In this manner, bikaverin, a cytotoxic metabolite isolated from several species of the fungal genera Gibberella, Fusarium, and Mycogone, was synthesised

Photo-induced isomerization of 2-acyl-3-methyl-1,4-naphthoquinone-2,3-epoxide

Abstract: 2-Acyl-3-methyl-1,4-naphthoquinone-2,3-epoxide(1) isomerizes photochemically to give lactone. The spectral data and chemical reactions of the lactone are compatible with structure(2). Photochemical reaction of (1) with xanthene was also described.

Spirofluorene xanthene phenol compound and preparation method thereof

Abstract: The invention provides a spirofluorene xanthene phenol compound and a preparation method thereof The method comprises the steps of adding 2,7-dihydroxy fluorenone, phenol and a catalyst to a container, wherein the molar ratio of the 2,7-dihydroxy fluorenone to the phenol is 1 to (4-8); the ratio of the catalyst to the 2,7-dihydroxy fluorenone is (01-10) to 1; heating to 120 DEG C to agitate and react for 2 hours; adding concentrated hydrochloric acid, wherein the mass ratio of the concentrated hydrochloric acid to the 2,7-dihydroxy fluorenone is (05-10) to 1; heating to 140 DEG C, keeping warm and reacting for 3 hours, cooling the product to room temperature, adding water to separate out sediment; washing with deionized water, leaching and drying in vacuum to obtain a crude product; recrystalizing the crude product by using ethanol water of which the volume ratio is 1 to 5 at 80 DEG C, and leaching and vacuum-drying the crystal to obtain the refined product The novel heat-resistant epoxy resin, polycarbonate and the like synthetized from the compound disclosed by the invention as the material have the characteristics of good heat stability, high transparency, high refractive index, and solubility and the like, and can be widely applied to the preparation of various materials with excellent performances

Spectrum on aqualuminescence from γ-irradiated NaCl in the presence of xanthene dyes

Abstract: Etude de l'augmentation de la luminescence en fonction de la concentration de colorants xantheniques (fluoresceine, eosine Y, pyronine G)