1210-12-4Relevant articles and documents
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Meek,Dann
, p. 6677 (1955)
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Field,L. et al.
, p. 1983 - 1987 (1961)
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Gallium-containing polymer brush film as efficient supported Lewis acid catalyst in a glass microreactor
Munirathinam, Rajesh,Ricciardi, Roberto,Egberink, Richard J.M.,Huskens, Jurriaan,Holtkamp, Michael,Wormeester, Herbert,Karst, Uwe,Verboom, Willem
, p. 1698 - 1704 (2013)
Polystyrene sulfonate polymer brushes, grown on the interior of the microchannels in a microreactor, have been used for the anchoring of gallium as a Lewis acid catalyst. Initially, gallium-containing polymer brushes were grown on a flat silicon oxide surface and were characterized by FTIR, ellipsometry, and X-ray photoelectron spectroscopy (XPS). XPS revealed the presence of one gallium per 2-3 styrene sulfonate groups of the polymer brushes. The catalytic activity of the Lewis acid-functionalized brushes in a microreactor was demonstrated for the dehydration of oximes, using cinnamaldehyde oxime as a model substrate, and for the formation of oxazoles by ring closure of ortho-hydroxy oximes. The catalytic activity of the microreactor could be maintained by periodic reactivation by treatment with GaCl3.
Preparation of 14C-labeled multiwalled carbon nanotubes for biodistribution investigations
Georgin, Dominique,Czarny, Bertrand,Botquin, Magali,Mayne-L'Hermite, Martine,Pinault, Mathieu,Bouchet-Fabre, Brigitte,Carriere, Marie,Poncy, Jean-Luc,Quang, Chau,Maximilien, Remy,Dive, Vincent,Taran, Frederic
, p. 14658 - 14659 (2009)
(Figure Presented) A new method allowing the 14C-labeling of carboxylic acid functions of carbon nanotubes is described. The key step of the labeling process is a decarbonylation reaction that has been developed and optimized with the help of a screening method. The optimized process has been successfully applied to multiwalled carbon nanotubes (MWNTs), and the corresponding 14C-labeled nanotubes were used to investigate their in vivo behavior. Preliminary results obtained after i.v. contamination of rats revealed liver as the main target organ. Radiolabeling of NTs with a long-life radioactive nucleus like 14C, coupled to a highly sensitive autoradiographic method, that provides a unique detection threshold, will make it possible to determine for a long time period whether or not NTs remain in any organs after animal exposure.
Grundmann,Frommfeld
, p. 2077,2078 (1965)
Gore et al.
, p. 227 (1969)
Beugelmans et al.
, p. 377 (1976)
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Gore,P.H. et al.
, p. 2927 - 2929 (1979)
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Preparation of (1R,1′R)-1,1′-(anthracene-9,10-diyl)bis(2,2,2-trifluoroethanamine): a chiral diamine with low basicity
Estivill, Carla,Mendizabal, Julen,Virgili, Albert,Monteagudo, Eva,Flor, Teresa,Sánchez-Ferrando, Francisco,Alvarez-Larena, Angel,Piniella, Juan F.
, p. 171 - 176 (2009)
A new chiral diamine with low basicity was synthesized in enantiopure form. (1R,1′R)-1,1′-(Anthracene-9,10-diyl)bis(2,2,2-trifluoroethanamine) was obtained by means of several stereochemically controlled reactions. The structures of the title compound and several intermediates were studied.
Copper-Catalyzed One-Pot Synthesis of Quinazolinones from 2-Nitrobenzaldehydes with Aldehydes: Application toward the Synthesis of Natural Products
Pal, Shantanu,Sahoo, Subrata
, p. 18067 - 18080 (2021/12/06)
A novel, efficient, and atom-economical approach for the construction of quinazolinones from 2-nitrobenzaldehydes has been unveiled via copper-catalyzed nitrile formation, hydrolysis, and reduction in one pot for the first time. In this reaction, urea is used as a source of nitrogen for nitrile formation, hydrazine hydrate is used for both the reduction of the nitro group and the hydrolysis of nitrile, and atmospheric oxygen is used as the sole oxidant. The method portrays a wide substrate scope with good functional group tolerances. Moreover, this method was applied for the synthesis of schizocommunin, tryptanthrin, phaitanthrin-A, phaitanthrin-B, and 8H-quinazolino[4,3-b]quinazolin-8-one.
A Molecular Iron-Based System for Divergent Bond Activation: Controlling the Reactivity of Aldehydes
Chatterjee, Basujit,Jena, Soumyashree,Chugh, Vishal,Weyhermüller, Thomas,Werlé, Christophe
, p. 7176 - 7185 (2021/06/30)
The direct synthesis of amides and nitriles from readily available aldehyde precursors provides access to functional groups of major synthetic utility. To date, most reliable catalytic methods have typically been optimized to supply one product exclusively. Herein, we describe an approach centered on an operationally simple iron-based system that, depending on the reaction conditions, selectively addresses either the C=O or C-H bond of aldehydes. This way, two divergent reaction pathways can be opened to furnish both products in high yields and selectivities under mild reaction conditions. The catalyst system takes advantage of iron's dual reactivity capable of acting as (1) a Lewis acid and (2) a nitrene transfer platform to govern the aldehyde building block. The present transformation offers a rare control over the selectivity on the basis of the iron system's ionic nature. This approach expands the repertoire of protocols for amide and nitrile synthesis and shows that fine adjustments of the catalyst system's molecular environment can supply control over bond activation processes, thus providing easy access to various products from primary building blocks.