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, 13C NMR analysis of xanthene formed as the major neutral product, indicated that the methylene carbon atom (C-9) of this compound was derived from C-1 (30%), C-2 (20%), and C-6 (50%) of the glucosyl units.
5 citations
TL;DR: Indene and fluorene were effectively carboxylated by employing the reagent system, 1,3-diphenylurea, potassium carbonate and carbon dioxide, in organic solvent at room temperature and atmospheric pressure as discussed by the authors.
Abstract: Indene, and fluorene were effectively carboxylated by employing the reagent system, 1,3-diphenylurea, potassium carbonate and carbon dioxide, in organic solvent at room temperature and atmospheric pressure, to produce indenemonocarboxylic acid and fluorene-9-carboxylic acid, respectively. Diphenylurea was almost quantitatively recovered unchanged. Cyclohexanone was slightly carboxylated by the similar procedure. But acetonitrile, acetophenone, dibenzylketone, diphenylmethane, and xanthene were scarcely carboxylated.
5 citations
Patent•
07 Apr 1989
TL;DR: A compound of formula I (A-CO) is residue of the medical compound; R is -NH- or -O-; m is 0, 1; n is 1-10).
Abstract: NEW MATERIAL:A compound of formula I (A-CO-is residue of the medical compound; R is -NH- or -O-; m is 0, 1; n is 1-10). EXAMPLE: Disodium salt of {α-(3',6'-dihydroxy-3-oxo-spiro[phthalane-1,9'- xanthene]-6-carbonyloxy)acetamidemethylene}bis(sulfonic acid). USE: Anti-inflammatory drugs. PREPARATION: A compound of formula A-COOH is reacted with a compound of formula II (OR 1 is protected OH; Y is halogen) to form a compound of formu la III. This compound is then put to elimination of the protective group contained to obtain a compound of formula IV. COPYRIGHT: (C)1990,JPO&Japio
5 citations
5 citations
Patent•
29 Jan 1991
TL;DR: In this article, bifunctional phenols are reacted with alkylamine and resultant reacted mixture is treated with acid to convert to N-alkylaminophenols salt.
Abstract: PURPOSE:To obtain the subject compound by reacting bifunctional phenols and alkylamine, converting tie subject compound to salt with acid treatment of reacted mixture, removing unreacted bifunctional phenols with extraction and separation in organic solvent, neutralizing residual salt and distilling. CONSTITUTION:Bifunctional phenols are reacted with alkylamine and resultant reacted mixture is treated with acid to convert to N-alkylaminophenols salt. Next, unreacted bifunctional phenols are extracted and separated in organic solvent. On the other hand, residual N-alkylaminophenolic acid salt is neutralized with alkaline aqueous solution and separated oil layer is distilled to obtain N-alkylaminophenols. Resultant compound is useful as intermediate of dye for heat-sensitive and pressure-sensitive paper, xanthene-based dye or fluorescent dye. Produced compound is readily and efficiently purified with excellent reaction efficiency, high conversion of bifunctional phenols and a small amount of by-product.
5 citations