Oxidations with Lead Tetra-acetate. Part I I .* " The Oxidation of Glycols with Lead Tetra-acetate," J., 1953, 102, is considered to be Part I.

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Some substituted o-nitroanilines have been oxidised with phen yl iodoso-The acetate in benzene, and the nature of the products has been determined. mechanism of the reaction is discussed.O-NITROANILINE , &methyl-and 4-chloro-2-nitroaniline, and 2 : 4-dinitroaniline are converted into the corresponding benzofurazan oxides, in excellent yield, by phenyl iodosoacetate in benzene (cf. Part 11, J., 1953, 1989).We have now found that 5-methyl-, 5-chloro-, and 5-methoxy-2-nitroaniline are similarly oxidised in yields of 90-93%.The products are identical with those obtained by the oxidation of either the 4-or 5-substituted 2-nitroanilines with alkaline sodium hypo-* Part 111, J., 1954, 3123.

Tertiary butyl hypochlorite reacts with 2-nitroaniline, 4-nitroaniline, N-methyl-4-nitroaniline, and NN-dimethyl-4-nitroaniline to form excellent yields of nuclear-chlorinated derivatives. Direct oxidation, to form azo compounds, is also observed with 4-nitroaniline and the yield of azo compound increases at higher temperatures. Demethylation also occurs when N-methyl-4-nitroaniline and NN-dimethyl-4-nitro-aniline are used.

The isolation and characterization of a relatively stable, highly basic zirconium-chromium(III) sulphate complex is described. This compound has an empirical formula corresponding to Na2O,3ZrO2,Cr2O3,4SO3,12H2O and appears to exist as the disodium salt of a complex anion Na2[Zr3Cr2(SO4)4(OH)12,6H2O]. Its properties indicate useful applications not only as a model compound to study the binding of transition metal complexes to proteins and peptides but also as a potential tanning agent for use in the leather industry.