cas 19398-61-9, 2,5-DICHLOROTOLUENE | Articles data

Articles about 19398-61-9Total 7 be found

H β molecular sieve catalytic O-chlorotoluene preparation 2, 6 - dichloro toluene method (by machine translation)
The invention relates to 2, 6 - dichloro toluene preparation technology field, in particular to a molecular sieve catalyst H β of O-toluene selective chlorination of preparation 2, 6 - dichloro toluene. The invention relates to a low cost of O-toluene as the raw materials, chlorine is the chlorinating agent, H β molecular sieve as the catalyst, adopt the one-step chlorination process, catalytic O-toluene selective chlorination of preparation 2, 6 - dichloro toluene, the process is easy to operate, simple steps, low production cost, easy industrialization. (by machine translation)
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Paragraph 0026; 0028-0031

(2017/08/26)

A chloro-toluene-ionic liquid catalyst preparation 2,6 the method of [...] dichloro-toluene
The invention discloses a method for preparing 2,6-dichlorotoluene by catalyzing o-chlorotoluene with an ionic liquid. According to the method for preparing 2,6-dichlorotoluene, Cl2 is taken as a chlorinating agent, under the action of a catalyst, namely, an aluminium chlorate ionic liquid, a raw material, namely, o-chlorotoluene, is directionally chlorinated, and the 2,6-dichlorotoluene is prepared; an intermediate of the aluminium chlorate ionic liquid is [BMIM]Cl, the molar ratio of AlCl3 to [BMIM]Cl is 1:3, and the usage amount of the aluminium chlorate ionic liquid accounts for 0.1%-1% of the mass of o-chlorotoluene; the method for preparing 2,6-dichlorotoluene by selectively chlorinating the o-chlorotoluene is simple in technology and mild in reaction condition, the used aluminium chlorate ionic liquid is good in catalytic activity and good in stability, can be separated from a product easily and can significantly improve the selectivity of 2,6-dichlorotoluene, and the method has the very high industrial application value.
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Paragraph 0024; 0027; 0032

(2017/02/24)

PROCESS FOR HALOGENATION OF BENZENE AND BENZENE DERIVATIVES
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.
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Page/Page column 21-22

(2008/06/13)

Electroreduction of Organic Compounds, 34 [1]. Cathodic Dehalogenation of Chloroarenes with Electron-Donating Substituents
The electrochemical reduction of chlorinated arenes with electron-donating substituents, i.e. chlorotoluenes, -anisoles and -phenols, is studied. Preparative electrolyses are run in various solvent-supporting electrolytes under potentiostatic and galvanostatic conditions at lead or carbon cathodes. A partial and mostly regioselective hydrodechlorination of compounds with two or more chloro substituents is possible under suitable conditions. The replacement of one single chloro substituent, in particular in a para-position, is difficult. Highly toxic and persistent oligochloro derivatives are thus transformed into less problematic compounds with a low degree of chlorination. The chlorine content of real-life materials such as extracts of soil contaminated with chlorinated phenols and Nitrofen can also be significantly decreased by electroreduction.
Kranz, Olaf,Voss, Jürgen
p. 1187 - 1200
(2007/10/03)

Kinetics of nuclear chlorination of toluene and some substituted toluenes by trichloroisocyanuric acid
Nuclear chlorination of toluene and substituted toluenes by trichloroisocyanuric acid is first order each in and .The observed second order rate constants increase with increase in +> in solvent mixtures containing less than 50percent HOAc.The k2 values increase with an increase in the proportion of HOAc, reach maximum at 50percent HOAc above which the rate constants have a diminishing trend.At higher proportion of HOAc, the rate constants are insensitive to change in .Added Cl- ions enhance the rate.Based on the observed results a plausible mechanism has been proposed which envisages a positive ion dipole reaction between H+2OCl generated from hydrolysis of TCICA and the substrate molecules at low proportions of HOAc.At high proportion of HOAc, chlorine acetate has been suggested to be the electrophile.Molecular chlorine as well as H2O+Cl are the chlorinating species in the presence of Cl- ions.The Hammett plot is linear with a ρ value -5.55.The activation parameters have been computed.
Panda, H. P.,Sahoo, K. K.
p. 717 - 720
(2007/10/02)

The method for parallel-producing 2,5-dichlorotoluene and 2,6-dichlorotoluene
The method for parallel-producing 2,5-dichlorotoluene and 2,6-dichlorotoluene comprising chlorinating the mixture of 4--tert-butyl (or isopropyl) toluene and 3,5-tert-butyl (or isopropyl) toluene in the presence of Lewis acid and simple substance sulphur, using the same chlorination apparatus, producing 4-tert-butyl (or isopropyl)-2,5-dichlorotoluene and 3,5-di-tert-butyl (or isopropyl)-2,6-dichlorotoluene, and transalkylating individually the same.
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(2008/06/13)

Process for producing 2,5-dichlorotoluene
Disclosed herein is a process for producing 2,5-dichlorotoluene which is useful as a monomer of heat-resistant polymers and an intermediate raw material for medicines, agricultrual chemicals and various organic synthetic substances, the process giving 2,5-dichlorotoluene at a high selectivity and in a high yield and comprising the steps of chlorinating 4-t-alkyltoluene or 4-isopropyltoluene in the presence of a catalyst, thereby obtaining a 2,5-dichlorocompound, and bringing the formed 2,5-dichlorocompound into contact with toluene in the presence of a catalyst, thereby subjecting the 2,5-dichlorocompound to transalkylation.
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(2008/06/13)