Journal ArticleDOI
Heteropolyacid: An efficient and eco-friendly catalyst for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene
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In this paper, a simple and efficient catalytic procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene was reported.Abstract:
A simple and efficient catalytic procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene is reported. Tungsten heteropoly acid catalysts are used both in bulk or supported on silica gel under solvent-free conditions at 100 °C. Good yields and short reaction time are advantages of this new method.read more
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Ionic liquid triethylamine-bonded sulfonic acid {[Et3N–SO3H]Cl} as a novel, highly efficient and homogeneous catalyst for the synthesis of β-acetamido ketones, 1,8-dioxo-octahydroxanthenes and 14-aryl-14H-dibenzo[a,j]xanthenes
Abdolkarim Zare,Ahmad Reza Moosavi-Zare,Maria Merajoddin,Mohammad Ali Zolfigol,Tahereh Hekmat-Zadeh,Alireza Hasaninejad,Ardeshir Khazaei,Mohammad Mokhlesi,Vahid Khakyzadeh,Fatemeh Derakhshan-Panah,Mohammad Hassan Beyzavi,Esmael Rostami,Azam Arghoon,Razieh Roohandeh +13 more
TL;DR: In this article, the efficiency, generality and applicability of novel Bronsted acidic ionic liquid triethylamine-bonded sulfonic acid {[Et 3 N−SO 3 H]Cl, N, N -diethyl- N -sulfoethanammonium chloride} as homogeneous and green catalyst for organic transformations under various conditions are studied.
Journal ArticleDOI
Heteropolyacid (H3PW12O40) supported MCM-41: An efficient solid acid catalyst for the green synthesis of xanthenedione derivatives
TL;DR: In this paper, a mesoporous molecular sieves of appropriate ratios were prepared by loading HPWA on siliceous MCM-41 by the wet impregnation method.
Journal ArticleDOI
Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis
Majid M. Heravi,Samahe Sadjadi +1 more
TL;DR: In this paper, a review of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus is presented. But the focus of this review is on the use of polyoxometalates as catalysts in a wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions.
Journal ArticleDOI
BF3·SiO2: an efficient alternative for the synthesis of 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes
TL;DR: Silica-supported boron trifluoride (BF 3 ·SiO 2 ) is an efficient, readily available, and reusable catalyst for the synthesis of 14-aryl or alkyl-14 H -dibenzo[ a,j ]xanthenes by condensation of 2-naphthol and aldehydes as discussed by the authors.
Journal ArticleDOI
The one-pot synthesis of 14-alkyl- or aryl-14H-dibenzo[a,j]xanthenes catalyzed by task-specific ionic liquid
TL;DR: In this article, a Bronsted-acidic task-specific ionic liquid, 1-methyl-3propane sulfonic-imidazolium hydrosulfate ([MIMPS]HSO 4 ), was employed as a catalyst for the synthesis of 14-alkyl- or aryl-14 H -dibenzo[ a, j ]xanthenes via the one-pot condensation of β-naphthol with aliphatic or aromatic aldehydes.
References
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Journal ArticleDOI
Catalysis by Heteropoly Acids and Multicomponent Polyoxometalates in Liquid-Phase Reactions
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Xanthene-dye-labelled phosphatidylethanolamines as probes of interfacial pH. Studies in phospholipid vesicles
C G Knight,T Stephens +1 more
TL;DR: Three lipophilic pH indicators made by covalently binding the xanthene dyes fluoresce in, eosin or dichlorofluorescein to the amino group of phosphatidylethanolamine were incorporated into phospholipid vesicles and the effect of pH on the fluorescence was characterized and it was concluded that these probes were promising candidates for the measurement of pH values at cell surfaces.
Journal ArticleDOI
The incorporation of various porphyrins into blood cells measured via flow cytometry, absorption and emission spectroscopy
TL;DR: Of the three sulfonated porphyrins investigated only TPPS4 was efficiently incorporated into leukocytes, and in the incubation solvent this dye was in monomeric and neutral form.
Journal ArticleDOI
Chemical Aspects of Santalin as a Histological Stain
Arnab Banerjee,Abhijit Mukherjee +1 more
TL;DR: The structural formulae of the santalins are presented and their differences from santarubins indicated and the possible mechanism of staining is discussed.
Journal ArticleDOI
Sulfamic acid: a novel and efficient catalyst for the synthesis of aryl-14H-dibenzo[a.j]xanthenes under conventional heating and microwave irradiation
TL;DR: In this paper, a simple and convenient procedure for the synthesis of aryl-14 H -dibenzo[ a. j ]xanthenes was described through a one-pot condensation of β-naphthol with aryls aldehydes in the presence of sulfamic acid as the catalyst in a solvent-free media using both conventional heating and microwave irradiation.
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Xanthene-dye-labelled phosphatidylethanolamines as probes of interfacial pH. Studies in phospholipid vesicles
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