19398-61-9Relevant articles and documents
H β molecular sieve catalytic O-chlorotoluene preparation 2, 6 - dichloro toluene method (by machine translation)
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Paragraph 0026; 0028-0031, (2017/08/26)
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)
PROCESS FOR HALOGENATION OF BENZENE AND BENZENE DERIVATIVES
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Page/Page column 21-22, (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.
Kinetics of nuclear chlorination of toluene and some substituted toluenes by trichloroisocyanuric acid
Panda, H. P.,Sahoo, K. K.
, p. 717 - 720 (2007/10/02)
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.