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, a three-component domino reaction of dimedone, aromatic aldehydes and 1,3-cyclohexanedione was used in the regio-selective synthesis of 3, 3-dimethyl-9-phenyl-2 H -xanthene-1,8(5 H, 9 H )-diones.
6 citations
Patent•
23 Dec 1983TL;DR: In this paper, the present invention is concerned with novel xanthene compounds of the formula ##STR1## wherein each R1 is the same and is selected from the same set of compounds in the formula #STR2## where R2 is alkyl, R3 is an electron-withdrawing group positioned ortho, meta or para to said N atom, R4 is hydrogen, R5 is a electron-donating group, X is an anion and A is an ion.
Abstract: In one embodiment, the present invention is concerned with novel xanthene compounds of the formula ##STR1## wherein each R1 is the same and is selected from ##STR2## R2 is alkyl, R3 is an electron-withdrawing group positioned ortho, meta or para to said N atom, R4 is hydrogen, alkyl or an electron-withdrawing group positioned ortho, meta or para to said N atom; R5 is alkyl; X is hydrogen, an electron-withdrawing group or an electron-donating group; and A is an anion In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds, eg, as photographic light-screening dyes
6 citations
TL;DR: In this article, a new condensation reaction of 1-naphthol or phenol derivatives with oxalic acid in the presence of sulfuric acid was used to synthesize halogen-and methyl-substituted xanthones.
Abstract: Dibenzo [c, h] xanthone and halogen-and methyl-substituted xanthones have been synthesized by the oxidation of novel spirolactones of dibenzo [c, h] xanthene and xanthene, which were prepared by a new condensation reaction of 1-naphthol or phenol derivatives with oxalic acid in the presence of sulfuric acid. The oxidation was carried out by using potassium permanganate in the presence of aqueous potassium hydroxide. The dibenzo [c, h] xanthone and xanthones were identical with samples obtained by another synthetic route.
6 citations
Patent•
27 Feb 2013
TL;DR: In this paper, the authors presented a color filter with a xanthene-based purple dye compound and a coloring resin composition for a colour filter containing the same, which exhibits superior heat resistance, chemical resistance, light resistance and brightness due to the homopolymer structure.
Abstract: The present disclosure relates to a purple dye compound for a color filter and a coloring resin composition for a color filter containing the same. The novel xanthene-based purple dye compound or the polymer dye compound obtained using the same as a monomer has superior solvent resistance and superior miscibility with a pigment in an organic solvent. Further, it exhibits superior heat resistance, chemical resistance, light resistance and brightness due to the homopolymer structure. Accordingly, a coloring resin composition containing the same can be used widely as a dye for synthetic resins and synthetic fibers, as a coloring agent for polymer materials, for a color filter used in LCDs, PDPs, etc., and so forth.
6 citations
Patent•
03 Aug 2006
TL;DR: In this article, a xanthene-based compound is characterized by being expressed by general formula (I) [wherein, R 1 is a 1-4C straight chain alkyl; R 2, R 3 are each independently H or a 1 4C straight-chain or branched chain alkoxy; and M is H, an alkali metal or NH 4 ].
Abstract: PROBLEM TO BE SOLVED: To provide a new xanthene-based compound useful as a coloring agent, etc., and coloring liquid containing the same and the xanthene-based compound having high light fastness of its color. SOLUTION: This xanthene-based compound is characterized by being expressed by general formula (I) [wherein, R 1 is a 1-4C straight chain alkyl; R 2 , R 3 are each independently H or a 1-4C straight chain or branched chain alkyl or a 1-4C straight chain or branched chain alkoxy; and M is H, an alkali metal or NH 4 ]. COPYRIGHT: (C)2006,JPO&NCIPI
6 citations