1459-09-2Relevant academic research and scientific papers
Liquid-crystalline polymorphism of symmetrical azobananas: Bis(4-(4-alkylphenyl)azophenyl) 2-nitroisophtalates
Zygadlo,Dardas,Nowicka,Hofmann,Galewski
, p. 283 - 291 (2011/08/02)
In this paper we present a series of novel compounds, bis(4-(4-alkylphenyl) azophenyl) 2-nitroisophtalates, which exhibit nematic and banana-type liquidcrystalline phases. The alkyl chain length varies from 1 to 18 carbons. The first ten members of this series exhibit nematic phase. The last eleven compounds exhibit banana-type liquid crystalline phases. The propyl and pentyl derivatives have extra second type of banana mesophase. Copyright Taylor & Francis Group, LLC.
Iron-catalyzed desulfinylative C-C cross-coupling reactions of sulfonyl chlorides with grignard reagents
Rao Volla, Chandra M.,Vogel, Pierre
, p. 1305 - 1307 (2008/12/22)
(Chemical Equation Presented) A friendly couple: Conditions have been uncovered that allow the desulfinylative C-C cross-coupling reaction of inexpensive sulfonyl chlorides and Grignard reagents (see scheme, acac = acetylacetonate, NMP = N-methylpyrrolidone). The reactions rely on environmentally friendly iron catalysts and do not require expensive and/or toxic ligands.
Enhanced selectivity in the preparation of linear alkylbenzenes using hexagonal mesoporous silica supported aluminium chloride
Price, Peter M.,Clark, James H.,Martin, Keith,Macquarrie, Duncan J.,Bastock, Tony W.
, p. 221 - 225 (2013/09/08)
For decades sulphonated linear alkylbenzenes have been one of the worlds most important detergents. Industrially, their preparation involves the use of either aluminium chloride or hydrogen fluoride as catalysts in the alkylation stage of the reaction. The use of these catalysts presents severe problems in terms of both their environmental impact and their lack of selectivity towards the desired product. Solid acids, such as zeolites, can overcome these problems but at the expense of activity. It has now been discovered that by chemically supporting aluminium chloride on a MCM-41 type silica a reuseable catalyst is produced. It can be easily separated from the products and is environmentally benign. In addition, the new catalyst exhibits significant improvements in selectivity towards both the monoalkylated product and the preferred 2-phenyl isomer. Selectivity can be further increased by maximizing the relative activity of the catalytic sites situated within the pores of the catalyst.
Environmentally Friendly Catalysis using Supported Reagents: Evolution of a Highly Active Form of Immobilised Aluminium Chloride
Clark, James H.,Martin, Keith,Teasdale, Andrew J.,Barlow, Simon J.
, p. 2037 - 2040 (2007/10/02)
An entirely heterogeneous form of aluminium chloride that is highly active in the liquid-phase alkylation of aromatics using alkenes and chloroalkanes is prepared by treating porous support materials with AlCl3 in solution.
