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.

Compound and method for producing the same

Abstract: PROBLEM TO BE SOLVED: To provide: a compound excellent in solubility in organic solvents as a dye having a xanthene skeleton to be used in industrial fields such as a fiber material, liquid crystal display and inkjet; and production method thereof.SOLUTION: A compound is expressed by formula (I), wherein Rrepresents a 1-8C aliphatic hydrocarbon group or a 5-8C alicyclic hydrocarbon group, the hydrogen atom contained in the aliphatic hydrocarbon group may be substituted by a 6-10C aromatic hydrocarbon group (the hydrogen atom contained in the aromatic hydrocarbon group may be substituted by a 1-3C alkyl group or 1-3C alkoxy group); Ar represents a phenyl group having a 1-3C alkyl group which may be substituted by a halogen atom.

Electroosmotic liquid composition and electroosmosis controlling element

Abstract: PURPOSE:To obtain a high electroosmotic degree even in a high b.p. region and to render its value variable by dissolving polyoxymethylene alkylphenol ether or an oil-soluble dye soluble in liquid solvents in a specified liquid solvent. CONSTITUTION:A liquid composition used there is prepared by dissolving polyoxymethylene alkylphenol ether or an oil-soluble dye soluble in liquid solvents, in a liquid solvent contg. benzene, alkylbenzene, halogenated benzene, or halogenated paraffin. Preferable solvents for said solvent are as follows; benzene type hydrocarbons, such as benzene, toluene, xylene, and other alkylbenzene, halogenated benzene, such as monochlorobenzene and o-dichlorobenzene, and halogenated paraffin, such as n-hexylchloride and n-octyl chloride. As said polyoxymethlene alkylphenol ether to be dissolved, nonionic surfactants represented by the formula shown here in which R is alkyl of CmH2m+1, and n, m are each a positive integer are used. A preferable oil-soluble dye is one of disazo type, phthalocyanine type, xanthene type, monoazo type, and anthraquinone type.

Sulfur trioxide sulfonation of diphenyl ether, diphenyl sulfide, dibenzo[b, e][1, 4]dioxin, and xanthene

Abstract: The sulfur trioxide sulfonation of diphenyl ether (1), diphenyl sulfide (2), and the related tricyclic dibenzo-[b, e][1, 4]dioxin (3) and xanthene (4) has been studied. The substrates 1 and 2 both yield initially the 4-sulfonic acid derivative (4-S) and subsequently the 4, 4′-S2. In a large excess of 104.5 wt-% H2SO4 the further sulfonation of 1-4, 4′-S2 gave the 1-2, 4, 4′-S3 and subsequently some 1-2, 4, 2′,4′-S4. Sulfonation of the dibenzodioxin 3 with 4.0 mol-equiv. of SO3 gave the 2-S derivative, whereas with 12.0 mol-equiv. of SO3 a mixture of the 2, 7-S2 and 2, 8-S2 was obtained in yields of 57 and 43%, respectively. Sulfonation of xanthene (4) with 4.0 mol-equiv. of SO3 yielded the 2, 7-S2 derivative.

Eosin Y-Containing Metal-Organic Framework as a Heterogeneous Catalyst for Direct Photoactivation of Inert C-H Bonds.

Abstract: Xanthene dyes as a class of ideal organic homogeneous photocatalyst have received significant attention in C-H bond activation; however, the inherent nature of fast carrier recombination/deactivation and low stability limits their practical applications. Herein, by the ingenious decoration of eosin Y into a porous metal-organic framework (MOF), a high-performance heterogeneous MOF-based photocatalyst was prepared to efficiently activate inert C-H bonds on the reactants via the hydrogen atom transfer pathway for the functionalization of the C-H bonds. Taking advantage of the fixation effect of a rigid framework, the incorporation of eosin Y into MOF leads to great enhancement of their chemical durability. More importantly, by the introduction of the second auxiliary ligand, the carbonyl groups of xanthene on the eosin Y dyes were perfectly retained and periodically aligned within the confined channels of this rigid framework, which could effectively form excited state radicals to prompt inert C-H bond activation, promoting reaction efficiency by the host-guest supramolecular interaction. New eosin Y-based MOFs were recyclable for six times without reducing photocatalytic activity. This eosin Y functionalized MOF-based heterogeneous photocatalytic system provides an availably catalytic avenue to develop a scalable and sustainable synthetic strategy for the practical application of organic dyes.