608-23-1Relevant articles and documents
NEW PROCESSES FOR PREPARING 4-SUBSTITUTED IMIDAZOLES
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Page/Page column 40; 41, (2013/03/26)
There is provided a novel process for the preparation of a compound of formula (I), (Formula (I)). There is also provided novel processes to intermediates of the compound of formula (I), as well as novel intermediates themselves.
Microwave assisted solid additive effects in simple dry chlorination reactions with n-chlorosuccinimide
Bucos, Madalina,Villalonga-Barber, Carolina,Micha-Screttas, Maria,Steele, Barry R.,Screttas, Constantinos G.,Heropoulos, Georgios A.
experimental part, p. 2061 - 2065 (2010/04/26)
Solid additives participate in the dry microwave assisted chlorination reaction of N-chlorosuccinimide with the xylenes affecting both yields and chemoselectivities. Total yields can be increased up to nine times for simple alkylaromatics and chemoselectivities can be altered according to the desired ring or α-side chlorination product by choosing the appropriate additive. We believe that in these reactions the solid additives play a very important role by increasing yields and affecting chemoselectivities, as well as behaving as microwave energy absorbers that consequently aid the transfer of heat to the active reagents.
Regiospecific chlorination of xylenes using K-10 montmorrillonite clay
Thirumamagal,Narayanasamy, Sureshbabu,Venkatesan
body text, p. 2820 - 2825 (2009/05/07)
Regiospecific chlorination of xylenes has been developed by employing NCS as a reagent and K-10 montmorrillonite clay as a solid support. Copyright Taylor & Francis Group, LLC.
Chlorination of aromatic substrates catalyzed by the phthalocyanine complexes
Ivanov,Tsentalovich,Kogan,Tomilova,Zefirov
experimental part, p. 1676 - 1679 (2011/04/23)
The chlorination of benzene, toluene, and o-xylene with molecular chlorine in the presence of the phthalocyanine complexes of different structures was studied. The transformations of the catalysts during the reaction were investigated.
PROCESS FOR HALOGENATION OF BENZENE AND BENZENE DERIVATIVES
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Page/Page column 12-13, (2008/06/13)
In a process of halogenation of benzene or benzene derivatives, di-substituted halobenzene derivatives having para-aromatic compounds or tri-substituted halobenzene derivatives having 1,2,4-substituted aromatic compounds are selectively produced. In halogenation of benzene or benzene derivatives, a fluorine-containing zeolite catalyst such as L-type zeolite, or a zeolite catalyst having the crystal size of at most 100 nm is used. The reaction is preferably effected in the presence of a solvent, and the solvent is preferably a halogenated compound.
Process for the nuclear chlorination of ortho-xylene
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Page column 4-5, (2008/06/13)
A process for the chlorination of the nucleus of ortho-xylene comprises reaction of ortho-xylene and a chlorinating agent in the presence of a Friedel-Crafts catalyst and chlorine-substituted 2,8-dimethyl-phenoxathiine as a cocatalyst.
Process for the hydrodechlorination of nuclear chlorinated ortho-xylenes
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Page 4, (2008/06/13)
A process for the hydrodechlorination of nuclear-chlorinated o-xylene and recovery of o-xylene with the formation of HCl comprises hydrogenation of the nuclear-chlorinated o-xylene at a noble metal containing catalyst at 220-360 degrees C.
Liquid-Phase Decarboxylation of Aromatic Haloformates: A New Access to Chloro- and Fluoroaromatics
Lui, Norbert,Marhold, Albrecht,Rock, Michael H.
, p. 2493 - 2496 (2007/10/03)
The treatment of phenyl chloroformates 1 with a Lewis acid in the liquid phase resulted in decarboxylation to the corresponding chloroaromatics 2. Fluoroaromatic compounds were synthesized from phenylchloroformates 1 through a sequential fluorination/decarboxylation in the liquid phase by treatment with excess anhydrous hydrogen fluoride under mild conditions. In all cases, yields were increased by performing the reaction in 1,2,4-trichlorobenzene, which is inert to Friedel-Crafts reactions.
Versatility of Zeolites as Catalysts for Ring or Side-Chain Aromatic Chlorinations by Sulfuryl Chloride
Delaude, Lionel,Laszlo, Pierre
, p. 5260 - 5269 (2007/10/02)
Zeolites catalyze chlorination of aromatics by sulfuryl chloride SO2Cl2.It is possible by an appropriate choice of the catalyst to effect at will, with very high selectivity, either the ring or the side-chain chlorination.Zeolite ZF520 is the choice catalyst for the former, because of its high Broensted acidity.Zeolite NaX (13X) is a fine catalyst for the latter, free-radical chlorination; the reaction is best effected in the presence of a light source; the catalyst can be reused many times with no loss in activity.Both reaction modes, the ionic (ring chlorination)and the radical (side-chain substitution), are likely to occur outside of the channel network in the microporous solid.The effects of various experimental factors - such as the nature of the solvent, the reaction time and temperature, the Broensted acidity of the solid support, the presence of radical inhibitors, and the quantity of catalysts - were investigated.The procedures resulting from this study are very easy to implement in practice and are quite effective.
