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.

Introduction of a new ionic liquid solid acid based on clay as an efficient, recyclable and thermally stable catalyst for organic transformations

Abstract: Ammonium hydrogen sulfate based ionic liquid immobilized on Na+–montmorillonite (AHS@MMT) was prepared via anchoring ammonium hydrogen sulfate propyltriethoxysilane onto sodium montmorillonite by covalent bonds. The synthesized catalyst was full characterized by FT-IR, SEM, TGA and XRD techniques and Hammett acidity test and the catalytic activity of this novel catalyst was evaluated for the synthesis of coumarin and xanthene derivatives. High yields of the products and simple workup and separation of them, easy separation and recovery of catalyst, solvent free conditions and use of an inexpensive catalyst are some of the advantages of our procedure. Also this catalyst can be reused several times without loss of its catalytic activity.

Dye composition comprising at least one polycationic direct dye, dyeing processes, uses, and multi-compartment devices

Abstract: Disclosed herein is a dye composition for dyeing human keratin fibers, such as the hair, comprising a direct polycationic dye of formula (I) below: Col-Z-Col (I) in which Col, which may be identical or different, is a noncationic dye chosen from azo dyes, methine dyes, azomethine dyes, phenothiazine dyes, triarylmethene dyes, xanthene dyes, phenanthridine dyes, and phthalocyanin dyes; and Z is chosen from linear and branched, saturated and unsaturated C 1 -C 20 hydrocarbon-based groups comprising at least one nitrogen atom and bearing at least two cationic charges, and also to processes for dyeing human keratin fiber using said composition, to the use of the dyes of formula (I) as direct dyes, and to multi-compartment devices.

New Approach for Tetrachlorosilane Promoted One-Pot, Condensation Reaction for Tetrahydrobenzo[a]Xanthene-11-Ones with Docking Validation as Aurora Kinase Inhibitor

Abstract: An efficient synthesis is reported for tetrahydrobenzo[a]xanthene-11-ones through a one-pot catalytic reaction by mixing β-naphthol, demidone and aromatic aldehydes in the presence of a catalytic amount of tetrachlorosilane (TCS) in methylene chloride as solvent at ambient temperature compared with other catalysts derived from silicon. Aurora kinase inhibitors have attracted a great deal of interest as a new class of antimitotic agents and so the molecular docking study was carried out on the synthesized compounds compared with pentacyclic AKI-001 to discover a novel class of Aurora inhibitors based on a tetracyclic xanthene scaffold and understand the orientation and the interaction of each molecule inside the active site of the Aurora A enzyme.

Fluorescence dyes and their use as fluorescence markers

Abstract: The subject matter of the invention are new xanthene derivatives of the formula I, wherein R1,R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, and X, Y, are as defined herein. The compounds according to the invention provide molecules that are—due to their spectral properties (absorption maxima in the range of approx. 650 nm and above as well as emission maxima above 670 nm)—very suitable for the use as dyes and in particular as fluorescence dyes. The compounds of the formula I according to the invention are used for the production of fluorescence conjugates, for their application in immunoassays, for DNA analytics, for in-vivo diagnostics or as a laser dye.