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 series of new azo-linked xanthene derivatives was synthesized via the eco-friendly multi-component condensation of azo linked salicylaldehyde derivatives and dimedone under ultrasound irradiation.
Abstract: A series of new azo-linked xanthene derivatives was synthesized via the eco-friendly multi-component condensation of azo-linked salicylaldehyde derivatives and dimedone under ultrasound irradiation...
1 citations
01 Jan 2018
TL;DR: In this paper, the authors present an autobiographical statement: "Autobiographical Statement of Autobiographical Statements" (A.W.A.B.C.232)
Abstract: ......................................................................................................229 Autobiographical Statement.................................................................................232
1 citations
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TL;DR: In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) Å from planarity and the cyclohexene ring exhibits a puckered conformation.
Abstract: In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) A from planarity and the cyclohexene ring exhibits a puckered conformation [puckering parameters QT = 0.452 (3) A, θ = 57.0 (4) and φ = 131.7 (4)°]. The cyclohexene ring attached to the xanthene system adopts an envelope conformation, with the middle of the three methylene C atoms as the flap atom. In the crystal, O—H⋯O and C—H⋯O hydrogen bonds form infinite chains of R12(6) ring motifs along [100] with the xanthene groups arranged in an alternating zigzag manner.
1 citations
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TL;DR: This work has found the RBB molecule to be disordered with a methyl group of one ethyl substituent of a diethylamino group at one extremity of the xanthene unit disordered over two positions, which leads to four kinds of RBB conformations, which, in turn, results in the formation of 16 discrete RBB⋯EG⋰EG ⋯RBB dimers in the crystal.
Abstract: The title compound, C28H30N2O3·C9H10O5, is a well known red leuco complex of 2-(6-diethylamino-3-diethyliminio-3H-xanthene-9-yl)benzoate (rhodamine B base abbreviated to RBB: leuco dye) with ethyl gallate (EG: developer). The structure of the complex at room temperature has recently been reported by Sekiguchi, Takayama, Gotanda & Sano [(2007) Chem. Lett. 36, 1010–1011]. The RBB–EG complex forms a dimer (RBB⋯EG⋯EG⋯RBB) through intermolecular O—H⋯O hydrogen bonds. In a subsequent re-examination of the structure at room temperature, we found the RBB molecule to be disordered with a methyl group of one ethyl substituent of a diethylamino group at one extremity of the xanthene unit disordered over two positions [occupancies: 0.735 (5)/0.265 (5)]. Furthermore, at the other end of the xanthene residue, the entire diethylamino substituent (i.e. the N atom and the associated C and H atoms) was also disordered over two sites with occupancies 0.653 (7)/0.347 (7). This leads to four kinds of RBB conformations, which, in turn, results in the formation of 16 discrete RBB⋯EG⋯EG⋯RBB dimers in the crystal.
1 citations
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16 Oct 1973
TL;DR: The disclosure is directed to bis(substituted alkyloxy)xanthen9-ones which have the formula where R1 and R2 are the same and are di(lower)alkylamino(lower), piperidino (lower)alkyl, or hexamethyleneimino(low-alkyl) as discussed by the authors.
Abstract: The disclosure is directed to bis(substituted alkyloxy)xanthen9-ones which have the formula WHERE R1 and R2 are the same and are di(lower)alkylamino(lower)alkyl, piperidino(lower)alkyl, or hexamethyleneimino(lower)alkyl. The compounds have antiinflammatory and immunoregulant activity when evaluated in standard pharmacological procedures, and activity as interferon inducers.
1 citations