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: A facile synthetic route utilizing readily available reagents affords a series of regioisomerically pure xanthene dye derivatives, avoiding the need for relatively inefficient oxidation chemistry and/or harsh conditions.
Abstract: A facile synthetic route utilizing readily available reagents affords a series of regioisomerically pure xanthene dye derivatives. Advantages include relatively mild conditions and good to excellent yields. Nonpolar, highly crystalline intermediates are isolable by standard chromatographic techniques. The intermediates are in the requisite xanthene oxidation state, thus avoiding the need for relatively inefficient oxidation chemistry and/or harsh conditions. During the course of this work, a new boron-mediated 1,2-aryl migration reaction was discovered.
53 citations
TL;DR: The dyes were degraded in ˜10 min and CZrP exhibited stability during multiple runs of degradation of the dyes and the potential of CZRP as catalyst for the hydrogen peroxide degradation of dyes was investigated.
52 citations
TL;DR: In this article, a wide bite angle amine, arsine and mixed phosphineamine and phosphinearsine ligands based on xanthene backbones were synthesized.
Abstract: New wide bite angle amine, arsine and mixed phosphineamine and phosphinearsine ligands based on xanthene backbones were synthesized. The co-ordination chemistry and the catalytic performance of these ligands were compared to those of the parent phosphine ligands. The amine based xanthene ligands do not form rhodium–hydride complexes and therefore give very poor rhodium hydroformylation catalysts. The catalytic performance of the xantarsine and the mixed xantphosarsine ligands is comparable with that of the xantphos ligands and they form similar (ligand)Rh(CO)2H and [(ligand)Rh(CO)2]2 complexes. In the platinum/tin-catalysed hydroformylation the xantarsine and the mixed xantphosarsine ligands proved to be superior to the xantphos ligands. The remarkably high selectivity and activity that is displayed by the mixed xantphosarsine ligand is explained by its wide natural bite angle and the formation of cis co-ordinated platinum complexes.
52 citations
TL;DR: The limiting fluorescence anisotropies (r0) of perylene, perylenyl and xanthene derivatives in different solvents, micelles and lipid vesicles have been determined as discussed by the authors.
Abstract: The limiting fluorescence anisotropies (r0) of perylene, perylenyl, perylenoyl and xanthene derivatives in different solvents, micelles and lipid vesicles have been determined. It is found that r0= 0.369 ± 0.002 for the perylene and the perylenyl compounds, r0= 0.377 ± 0.002 for the perylenoyl compounds and r0= 0.373 ± 0.002 for the xanthene derivatives. Among the xanthenes, fluorescein monoglucoronide (FG) is an exception with r0= 0.392. It appears, however, that the absorption and fluorescence spectra of FG also differ markedly in shape from those of fluorescein and different rhodamines. The reason for r0 < ⅖ is not compatible with Jablonski′s theory of torsional vibrations of a rigid molecule, or a free rotational motion in the solvent cavity, but seems to be an inherent property of the chromophoric part of a molecule.
51 citations