Results 11 to 20 of about 4,473 (184)

A Convenient Preparation of Xanthene Dyes. [PDF]

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Youjun, Yang, Jorge O, Escobedo, Alexander, Wong, Corin M, Schowalter, Michael C, Touchy, Lijuan, Jiao, William E, Crowe, Frank R, Fronczek, Robert M, Strongin   +8 more
openaire   +2 more sources

3′,6′-Bis(ethylamino)-2′,7′-dimethyl-2-{[2-[(E)-3,4-methylenedioxybenzylideneamino]ethyl}spiro[isoindoline-1,9′-xanthen]-3-one

Acta Crystallographica Section E, 2009
The title compound, C36H36N4O4, was prepared as a spirolactam ring formation of the rhodamine dye for comparison with a ring-opened form. The xanthene ring system is approximately planar [r.m.s.
Zhi-Hong Xu, Hong-Sheng Wang, Lian-Ting Tao, Hong-Wei Wang   +3 more
doaj   +1 more source

2-[(5-Chloro-2-hydroxybenzylidene)amino]-3′,6′-bis(diethylamino)spiro[isoindoline-1,9′-xanthen]-3-one

Acta Crystallographica Section E, 2010
The title compound, C35H35ClN4O3, resulted from a spirolactam ring closure of rhodamine B dye. The xanthene ring system is approximately planar [r.m.s. deviation = 0.050 (9) Å for the xanthene ring].
Zhi-hong Xu, Wei-yun Guo, Bo-wei Su, Xu-Ke Shen, Feng-ling Yang   +4 more
doaj   +1 more source

Xanthene and Xanthone Derivatives as G-Quadruplex Stabilizing Ligands

Molecules, 2013
Following previous studies on anthraquinone and acridine-based G-quadruplex ligands, here we present a study of similar aromatic cores, with the specific aim of increasing G-quadruplex binding and selectivity with respect to duplex DNA.
Alessandro Altieri, Antonello Alvino, Stephan Ohnmacht, Giancarlo Ortaggi, Stephen Neidle, Daniele Nocioni, Marco Franceschin, Armandodoriano Bianco   +7 more
doaj   +1 more source

14-(4-Chlorophenyl)-14H-dibenzo[a,j]xanthene

IUCrData, 2019
In the title compound, C27H17ClO, the xanthene fused-ring system adopts a shallow butterfly conformation [dihedral angle between the two halves of the ring system = 22.9 (1)°.
Anuradha Roy Choudhury, Satya B. Paul, Sudip Choudhury   +2 more
doaj   +1 more source

Ozonation of Xanthene [PDF]

Bulletin of the Chemical Society of Japan, 1984
Abstract The ozonation of xanthene was studied using an oxygen stream. Ozone attacks the methylene group of xanthene via a 1,3-dipolar insertion reaction to give the hydrotrioxide intermediate, followed by a loss of singlet oxygen to form xanthydrol.
Masaki Matsui, Yoshihiko Miyamoto, Katsuyoshi Shibata, Yoshimi Takase   +3 more
openaire   +1 more source

Synthesis of xanthene derivatives based on α, α′-bis (substituted-benzylidene) cycloalkanones using tangstophosphoric acid under solvent-free conditions [PDF]

شیمی کاربردی روز, 2014
Tangstophosphoric acid (H3PW12O40) as an acidic catalyst has been used for facile synthesis of xanthene derivatives by the reaction of α,α′-bis (substituted-benzylidene) cycloalkanones and dimedone in solvent-free conditions.
الهام تبریزیان, علی عموزاده   +1 more
doaj   +1 more source

Crystal structure of 10a-hydroxy-9-(3-nitrophenyl)-3,6-diphenyl-3,4,5,6,7,8a,9,10a-octahydro-1H-xanthene-1,8(2H)-dione

Acta Crystallographica Section E: Crystallographic Communications, 2015
In the octahydroxanthenedione unit of the title compound, C31H27NO6, the central dihydropyran ring shows an envelope conformation, while the bilateral cyclohexene and cyclohexane rings adopt a half-boat conformation and a chair conformation, respectively.
Xin-Yuan Zhang, Bing-Xiang Hu, Ze-Yu Zhou, Lei Zhou, Fang-Ming Wang   +4 more
doaj   +1 more source

The Synthesis of Substituted Tetrahydro‐1H‐xanthen‐1‐ones and Xanthenes.

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Mahesh L. Patil, Hanumant B. Borate
openaire   +1 more source

2-[(2,4-Dihydroxybenzylidene)amino]-3′,6′-bis(ethylamino)spiro[isoindoline-1,9′-xanthen]-3-one

Acta Crystallographica Section E, 2010
The title compound, C35H36N4O4, was prepared as a spirolactam ring formation of rhodamine B dye for comparison with a ring-opened form. The xanthene ring system is approximately planar. The r.m.s. deviation from planarity is 0.064 (6) 
Zhi-Hong Xu, Yan-Ling Zhang, Yan-Ru Zhao, Feng-Ling Yang   +3 more
doaj   +1 more source