4-Chloronitrobenzene properties

Wu J-F, C-W Sun, C-Y Jiang, Z-P Liu, S-J Liu (2005) A novel 2-aminophenol 1,6-dioxygenase involved in the degradation of p-chloronitrobenzene by Comamonas strain CNB-1 purification, properties, genetic cloning and expression in Escherichia coli. Arch Microbiol 183 1-8. 

A new illustration of this approach is given in this paper with the hydroprocessing of chloronitrobenzenes over the sulfided industrial hydro-treating catalysts, CoO-MoOj/y-Al 203 HR 306 and NiO-MoOj/y-AlHR 348 from Procatalyse. These catalysts have been shown to differ in their hydrogeno-lysis rather than in their hydrogenation properties (ref.2). 

Combining the hydrogenation and hydrogenolysis properties of the catalysts, the better selectivity to 4-chloroaniline from 4-chloronitrobenzene is obtained over the CoMo catalyst at low temperature. Indeed, the kinetic... 

Commercial l-chloro-2,4-dinitrobenzene prepared by the nitration of a mixture of o- and p- chloronitrobenzenes usually contains the 1,2,6-isomer. The latter differs from the 1,2,4-isomer in some of its properties. According to Borsche and Rants-cheff [24], only the 1,2,4-isomer can react with the sodium salt of acetylacetic ester, the 1,2,6-isomer remaining unchanged. 

Structural Isomers. Chromatograms illustrating the separation of ortho, meta and para isomers of cresol (22) and and xylene ( O)on RP columns are shown in Figures 4 and 5. They enable a comparison of the chromatographic properties and selectivities due to <. - and -CD complexation between positional isomers of the above compounds.Similar behaviour was observed for ortho,meta and para isomers of fluoronitrobenzene, chloronitrobenzene, iodoni-trobenzene, nitrophenol, nitroaniline, dinitrobenzene (22), nitrocinnamic acid (22) some mandelic acid derivatives (19,21,34) and ethyltoluene (28). Both [Pg.225]

Trioitro derivatives of chlorobenzene Picryl chloride Ph> ical properties Chemical properties ] Ch]oro-2,4,5-irinitrobenzcnc Diagram of the nitration of chlorobenzene Thermochemical and explosive properties of chloronitrobenzenes Nitro derivatives of p-chlorobenzene Mononitro derivative ofp-chlorobenzene Dinitro derivative of p dichIorobenzene 2 4,6 Trinitroderivative of 1.3.S-trichtorobenzene Manufacture of l,3,5-trichloro-2.4.6-irinitrobenzenc Nitro derivatives of fluorobenzene Literature... 

In batch and continuous tests the performance of the colloidal catalyst systems has been compared to conventional Pt/C-systems. The potential of the colloidal heterogeneous catalyst lies in the possibility of fine tuning the properties for specific applications by the addition of special dopants or poisons to the precursor. The infiuence of metal ions on the hydrogenation of o-chloronitrobenzene over platinum colloids, and the effect of metal complexes on the catalytic performance of metal clusters have also been demonstrated [133-135]. 

The influence of preparation procedure on structural and surface properties of magnesium fluoride support and on the activity of ruthenium catalysts for selective hydrogenation of chloronitrobenzene... 

The effect of preparation conditions on structural and surface properties of magnesium fluoride was studied in the aspect of its use as a catalyst support. Amorphous and spherical polyciystaUine Mgp2 supports were prepared and characterised by BET, XRD, TEM, and FTIR (pyridine adsorption) techniques. The influence of Mgp2 properties on the performance of Ru/MgF2 catalysts in selective reduction of ortho- and para-chloronitrobenzene to respective chloroanilines is reported as well. 

From catalytic aspects latter structure seems to be more favourable. In this paper, through the example of Pd+Cu catalysts, we wish to present methods by which bulk metal deposition can be avoided, and bimetallic catalysts with well-designed uniform surface structure can be attained. The surface structure of bimetallic catalysts has been studied by an electrochemical polarization (EP) method and catalytic properties were analyzed by selective reduction of 4-chloronitrobenzene (CNB). 

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