منابع مشابه
β-Cyclodextrain sulfonic acid as a biodegradable solid catalyst in benzoxanthenes synthesis
A new and efficient synthesis of benzoxanthene drivatives from the three-component condensation reaction ofaryl aldehydes and β-naphthol under solvent-free conditions in the presence of β-cyclodextrin sulfonic acid, as an efficient heterogeneous solid acid catalyst with excellent yields and short reaction time is presented
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IN THE TITLE COMPOUND [SYSTEMATIC NAME: 5-(5,7-dihydr-oxy-4-oxo-4H-chromen-yl)-2-hydroxy-benzene-sulfonic acid dihydrate], C(15)H(10)O(8)S·2H(2)O, the benzopyran-one ring is not coplanar with the phenyl ring, the dihedral angle between them being 41.35 (3)°. No H atom was placed on the sulphonic acid group because it was not possible to distinguish between the two S=O bonds and the S-O bond. In...
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3,4-ِDihydropyrano[c]chromene derivatives were synthesized using sulfonic acid functionalized silica (SiO2-Pr-SO3H) as a highly efficient heterogenous solid acid catalyst via one-pot three-component condensation of aromatic aldehydes with malononitrile and 4-hydroxycoumarin in excellent yields.
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Biosurfaces are universally covered with fluid microfilms containing reduced glutathione (GSH) and other antioxidants whose putative roles include the detoxification of ambient ozone (O(3)). It is generally believed that O(3) accepts an electron from the thiolate GS(2-) function [pK(a)(GS(-)) = 8.8] of GSH to produce thiyl GS(*-) radicals en route to the disulfide GSSG. Here, we report novel el...
متن کاملThe Lethality of Some D-Arabinosyl Nucleotides to Mouse Fibroblasts1
1This study was supported by American Cancer Society Grant E587. 'Present address: University of Pennsylvania, School of Veterinary Medicine, New Bolton Center, Kennen Square, Pa. 19348. 3To whom reprint requests should be addressed. Present address: University of Colorado Medical Center, Department of Microbiology, Denver, Colo. 80220. 4The abbreviations used are: FdUrd, 5-fluoro-2-deoxyuridin...
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ژورنال
عنوان ژورنال: Journal of Sulfur Chemistry
سال: 2012
ISSN: 1741-5993,1741-6000
DOI: 10.1080/17415993.2012.706814