Platinum dinitrobenzenes

Epoxy-resins picryl chloride or chlor-2-4-dinitrobenzene p-phenyl diamine. Isocyanates proteolytic enzymes p henylene diamine complex salts of platinum cyanuric chloride. 

The selective hydrogenation of one nitro group of a dinitrobenzene represents yet another type of reaction selectivity observed with aromatic nitro groups. This reaction, which follows a combination of Type 11 and Type 111 selectivity (Chapter 5) (Eqn. 19.7) is influenced by a number of factors. It was found that in the hydrogenation of 2,6-dinitrotoluene to 2-amino-6-nitrotoluene (Eqn. 19.8), platinum and rhodium were more selective than palladium. With Pt/Al203... 

BZ was al so partially oxidized by Ag(II) in a small H-cell with stationary platinum electrodes. Compounds identified in anolyte extracts included phenol, hydroquinone, benzoquinone, benzaldehyde, benzoic acid, methyl benzoate, benzonitrile, benzonitrile aldehyde, and 4-nitro butylnitrile. The yellow color of the anolyte was probably due to benzoquinone, which had a relatively high concentration. A compound which was tentatively identified as benzoquinone epoxide ( 11403) was present at the highest concentration and is believed to be a product of the oxidation of benzoquinone. Numerous nitrated aromatics were also detected and include nitrobenzene, dinitrobenzene isomers, nitrophenol isomers, and dinitnophenol isomers. Intermediates are summarized in Table 3 and classified as I. BZ substrate II. nitrated BZs HI. phenols, quinones, and epoxides IV. nitrated phenols V. BZ substituted with aliphatic and aromatic... 

Carbonyl complexes of rhodium, ruthenium, osmium, iridium, and platinum, in the presence of H2O and a weak base (e.g., trimethylamine), act as catalysts for the conversion of propene to a mixture of butanol and methylpropanal with the exception of the platinum system, these catalysts are considerably more active than Fe(CO)s as reported by Reppe. Under the same conditions, but in the absence of olefin, the carbonyls act as catalysts for the conversion of CO and H2O to CO2 and H2. The metal carbonyls, together with Fe(CO)s, in the presence of H2O, CO, and a weak base such as McsN, serve as catalysts for the conversion of nitrobenzene, dinitrobenzene, and 2,4- and 2,6-di-nitrotoluene to the corresponding aminobenzene derivatives. 

Monomers. m-Phenylene diamine (MPD) can be prepared by the continuous liquid phase hydrogenation of m-dinitrobenzene at moderate temperatiu-es (7). One process employs a dispersion of the m-dinitrobenzene in water (8) another uses a solvent, such as DMF, which dissolves both the reactant and the MPD product (9). Catalysts for the hydrogenation include platinum, palladium, and nickel that must be recovered by filtration. Purification steps include vacuum distillation. 

Similar experiments were done with palladium under the conditions described in Section 2.3. First of all, a charged sheet (at a potential of the order of that used for platinum reduction, that is, -2 V versus SCE) of palladium in superdry DMF containing Csl appears to play the role of a reducing material. When this piece of palladium after chemical treatment is put in contact with a solution of AcQ or 1,4-dinitrobenzene, the corresponding color assigned to that of the anion radical... 

---