Results 131 to 140 of about 4,299 (162)

Xanthenes: fluorone derivatives. 1

The Journal of Organic Chemistry, 1992
Several new fluorone derivatives including 2,4,5,1-tetraiodo-6-hydroxy-3-fluorone, 2,4,5,1-tetrabromo-6-hydroxy-3-fluorone, and 2,4-diiodo-6-methoxy-3-fluorone were synthesized and their spectral and photophysical properties ...
Jianmin Shi, Xianping Zhang, Douglas C. Neckers   +2 more
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CLEAVAGE OF XANTHENE ETHERS: A NEW ROUTE TO 9-SUBSTITUTED XANTHENES

Canadian Journal of Chemistry, 1964
9,9-(Tetrachloro-o-phenylenedioxy) xanthene (IIa) and its thio-analogue (IIb) are cleaved by hydrazines to give the corresponding hydrazones of xanthone and thiaxanthone, respectively, together with tetrachlorocatechol. The unsaturated nitriles (Va), (Vb), and (Vc) are produced similarly by the action of malononitrile and cyanoacetic ester ...
N. Latif, I. Fathy, N. Mishriky
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Eccoptura xanthenes

Published as part of Myers, Luke William, Kondratieff, Boris C, Grubbs, Scott A, Pett, Lindsey A, DeWalt, R. Edward, Mihuc, Timothy B & Hart, Lily Veronica, 2025, Distributional and species richness patterns of the stoneflies (Insecta, Plecoptera) in New York State, pp.
Myers, Luke William, Kondratieff, Boris C, Grubbs, Scott A, Pett, Lindsey A, DeWalt, R. Edward, Mihuc, Timothy B, Hart, Lily Veronica   +6 more
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Photophysical characterization of xanthene dyes

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
The growing interest in using photodynamic therapy for cancer treatment and antimicrobial applications has prompted the search for different classes of dyes. In general, the protocols of these studies are different, making it difficult to compare their efficiency directly.
Eduardo V. Bergmann, Ana P.B. Cavalaro, Newller M. Kimura, Vitor S. Zanuto, Nelson G.C. Astrath, Leandro S. Herculano, Luis C. Malacarne   +6 more
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Xanthenes: Flourone Derivatives II

Tetrahedron Letters, 1993
Abstract A series of 9-hydrogen and 9-cyano substituted xanthenes was synthesized and their absorption spectra compared. It was found that the cyano group at the C-9 position can produce large bathochromic shifts (about 100 nm).
Jianmin Shi, Xian-Ping Zhang, Douglas C. Neckers   +2 more
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Spirolactones of xanthene. III. Formation and molecular structure of novel spirolactones of xanthene and dibenzo[c,h]xanthene

Journal of Heterocyclic Chemistry, 1987
AbstractThe reaction of 1‐naphthol or phenol derivatives with oxalic and sulfuric acids yielded novel spirolactones. Eight examples (2a‐h) were synthesized by this reaction. The structures of the spirolactones were established from spectral evidence and the X‐ray diffraction studies. Some of the spirolactones form the solvates with the aromatic solvent
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Xanthene-Modified and Hangman Iron Corroles

Inorganic Chemistry, 2011
Iron corroles modified with a xanthene scaffold are delivered from easily available starting materials in abbreviated reaction times. These new iron corroles have been spectroscopically examined with particular emphasis on defining the oxidation state of the metal center.
Matthias, Schwalbe, Dilek K, Dogutan, Sebastian A, Stoian, Thomas S, Teets, Daniel G, Nocera   +4 more
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Gastric antisecretory 9H-xanthen-9-amines

Journal of Medicinal Chemistry, 1983
A series of 9H-xanthen-9-amines possessing a wide variety of nitrogen substituents at C-9 was prepared for evaluation of gastric antisecretory activity. These substituents included the acetamidine, imidate, pyrimidine, thiazoline, quinuclidine, 2-hydrazinopyridine, aminopiperidine, aminoalkylimidazole, and aminoalkylpyridine moieties.
P E, Bender, C D, Perchonock, W G, Groves, R C, Smith, O D, Stringer, R, Sneed, J H, Schlosser, L S, Hostelley, B Y, Hwang, R Z, Eby, G, Konicki, P G, Lavanchy, J W, Wilson, B, Loev   +13 more
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Gortyna xanthenes Germar 1842

Published as part of Abad-Luna, Carmelo & Albaladejo-García, Aquilino, 2025, Macrolepidópteros de las comarcas de Cartagena y del Mar Menor (Murcia, SE España) (Insecta: Lepidoptera), pp.
Abad-Luna, Carmelo, Albaladejo-García, Aquilino   +1 more
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ChemInform Abstract: Spirolactones of Xanthene. Part 3. Formation and Molecular Structure of Novel Spirolactones of Xanthene and Dibenzo(c,h)xanthene.

ChemInform, 1987
Abstract1‐Naphthol (I) or the substituted phenols (IV) react with oxalic acid in the presence of sulfuric acid to give the spiro‐γ‐lactones (III) or (V) which form solvate complexes with aromatic solvent molecules such as toluene, xylene, or nitrobenzene.
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