Results 61 to 70 of about 4,299 (162)

Novel β-cyclodextrin–eosin conjugates

Beilstein Journal of Organic Chemistry, 2017
Eosin B (EoB) and eosin Y (EoY), two xanthene dye derivatives with photosensitizing ability were prepared in high purity through an improved synthetic route.
Gábor Benkovics, Damien Afonso, András Darcsi, Szabolcs Béni, Sabrina Conoci, Éva Fenyvesi, Lajos Szente, Milo Malanga, Salvatore Sortino   +8 more
doaj   +1 more source

Photosensitization of Colloidal SnO2 Semiconductor Nanoparticles with Xanthene Dyes

Journal of Chemistry, 2013
The photochemical behavior of xanthene dyes (fluorescein, erythrosine, and eosin) with colloidal SnO2 nanoparticles was probed by UV-visible, steady state, and time resolved fluorescence measurements. The prepared SnO2 nanoparticles were characterized by
N. Nagarajan, G. Paramaguru, G. Vanitha, R. Renganathan   +3 more
doaj   +1 more source

Spirolactones of xanthene. IV New method of xanthone synthesis by oxidation of novel spirolactones of dibenzo[c,h]xanthene and xanthenes.

Chemical and Pharmaceutical Bulletin, 1987
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.
MICHIO KIMURA, ICHIZO OKABAYASHI
openaire   +2 more sources

New synthetic strategies for xanthene-dye-appended cyclodextrins

Beilstein Journal of Organic Chemistry, 2016
Xanthene dyes can be appended to cyclodextrins via an ester or amide bridge in order to switch the fluorescence on or off. This is made possible through the formation of nonfluorescent lactones or lactams as the fluorophore can reversibly cyclize.
Milo Malanga, Andras Darcsi, Mihaly Balint, Gabor Benkovics, Tamas Sohajda, Szabolcs Beni   +5 more
doaj   +1 more source

3,11-Dibromo-14-(4-chlorophenyl)-14H-dibenzo[a,j]xanthene dimethylformamide monosolvate

Acta Crystallographica Section E, 2012
In the title compound, C27H15Br2ClO·C3H7NO, the xanthene moiety has a flattened boat conformation with a folding angle between the naphthalene units of 9.46 (3)°.
Yong Bin Song, Bo Liu
doaj   +1 more source

Nano-Fe3O4 encapsulated-silica particles bearing sulfonic acid groups as an efficient, eco-friendly and magnetically recoverable catalyst for synthesis of various xanthene derivatives under solvent-free conditions

Journal of Saudi Chemical Society, 2017
This report describes an efficient method for the synthesis of 1,8-dioxo-octahydroxanthene, 14H-dibenzo[a,j]xanthene, 12-aryl-tetrahydrobenzo[a]xanthenes-11-one and 13-aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraone derivatives in the presence of a ...
Firouzeh Nemati, Samane Sabaqian
doaj   +1 more source

(E)-2,4-Diamino-5-{7-[(4-chlorophenyl)diazenyl]-3,3-dimethyl-1-oxo-2,3,4,9-tetrahydro-1H-xanthen-9-yl}-6-oxo-1,6-dihydropyridine-3-carbonitrile dimethylformamide monosolvate

IUCrData
In the title compound, C27H23ClN6O3·C3H7NO, much of the molecule is approximately planar, excluding the pyridinic ring, which is almost perpendicular to this plane, and the sp3 atoms of the modified xanthene system. The diazene group is E-configured.
Galal H. Elgemeie, Nadia H. Metwally, El-shimaa S. M. Abd Al-latif, Peter G. Jones   +3 more
doaj   +1 more source

9-(2,4-Dichlorophenyl)-3,3,6,6-tetramethyl-3,4,5,6-tetrahydro-9H-xanthene-1,8(2H,7H)-dione

Acta Crystallographica Section E, 2010
The title compound, C23H24Cl2O3, was synthesized by reaction of 2,4-dichlorobenzaldehyde and 5,5-dimethylcyclohexane-1,3-dione in ethylene glycol. The central ring of the xanthene moiety is almost planar (with an r.m.s. deviation of 0.0268 &
Hao Shi
doaj   +1 more source

2-[(E)-2-(Benzylideneamino)ethyl]-3′,6′-bis(diethylamino)spiro[isoindoline-1,9′-xanthen]-3-one

Acta Crystallographica Section E, 2011
In the title compound, C37H40N4O2, the xanthene and spirolactam rings are almost planar, with r.m.s. deviations from the mean planes of 0.223 (2) and 0.057 (2) Å, respectively, and form a dihedral angle of 85.76&
Zhen Wei, Xujun Zheng, Junjun Bai, Xiaohong Zhai, Lili Song   +4 more
doaj   +1 more source

7-Bromo-9-(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-en-1-yl)-3,3-dimethyl-2,3,4,9-tetrahydro-1H-xanthen-1-one

Acta Crystallographica Section E, 2012
In the xanthene ring system of the title compound, C23H25BrO4, the 4H-pyran ring is almost planar [maximum deviation = 0.040 (3) Å] and the cyclohexene ring adopts a sofa conformation.
Shaaban K. Mohamed, Mehmet Akkurt, Antar A. Abdelhamid, Phillip E. Fanwick, Herman Potgeiter   +4 more
doaj   +1 more source