Zinin reduction

Zinin Reduction. The method of reducing aromatic nitro compounds with divalent sulfur is known as the Zinin reduction (57). This reaction can be carried out in a basic media using sulfides, polysulfides, or hydrosulfides as the reducing agent. These reactions can be represented as follows when the counter ion is sodium ... 

Although this reduction is more expensive than the Bnchamp reduction, it is used to manufacture aromatic amines which are too sensitive to be made by other methods. Such processes are used extensively where selectivity is required such as in the preparation of nitro amines from dinitro compounds, the reduction of nitrophenol and nitroanthraquinones, and the preparation of aminoazo compounds from the corresponding nitro derivatives. Amines are also formed under the conditions of the Zinin reduction from aromatic nitroso and azo compounds. 

The Zinin reduction is also usehil for the reduction of aromatic nitro compounds to amines in the laboratory. It requires no special equipment, as is the case with catalytic hydrogenations, and is milder than reductions with iron and acid. Usually ammonium or alkah sulfides, hydrosulftdes or polysulftdes are used as the reactant with methanol or ethanol as the solvent. 

Zinifex Ltd., 26 564 Zinin reduction, 2 490-491 Zircaloy tubes, 17 573 ansa-Zirconocene catalysts, C2-symmetrical, 16 114 ansa-Zirconocene complexes, 16 107 Zircon, 26 621-622... 

Reduction with hydrogen sulfide and its salts is sometimes referred to as the Zinin reduction (Org. Reactions 1973, 20,455). 

Zinc-copper couple, 20, 1 58, 1, 2 Zinin reduction of nitroarenes, 20, 4... 

Zinin reduction The reduction of a nitro compound to an amine using a sulphide or polysulphide. Z isomer See E isomer. 

For the reduction of nitroarenes to aminoarenes by the catalytic hydrazine H-transfer reduction method, the classical hydrogenation catalysts Ni, Pd and Pt are most commonly used [1] [2]. In a more extended study [3] we were able to confirm previously reported observations [4] that these reductions can also be catalysed by modified iron oxides hydroxides. This method for the production of many aromatic amines offers several advantages compared to the conventional processes still employed in industry, such as the environmentally imfavourable Bechamp [5] and Zinin reductions [6]. It is an outstanding feature of the novel reduction method presented here that further reducible substituents in nitroazo compounds, such as... 

The sensitivity of sulphide salts to the steric environment of the nitro group in a Zinin reduction has allowed 3-methyl-2-nitrobenzotrifluoride to be isolated unchanged from a mixture of the four nitro isomers, the three other isomers being reduced to the corresponding anilines. ... 

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