This paper reviews the use of copper deactivators and iron corrosion inhibitors in lubricating oils. The auto‐oxidation process is described in terms of initiation and chain propagation, branching and termination, and the primary and secondary oxidation inhibitors are described. Copper deactivators and corrosion inhibitors nature and action are discussed, and the paper also examines the applications for these additives.

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The infrared spectra of the 19 nitration products of diphenylamine were established. A comparison was made of the spectra obtained and assignments were made to the principle bands. The compounds considered were diphenylamine, N-nitrosodiphenylamine, 4-nitrosodiphenylamine, 2-nitrodiphenylamine, 4-nitrodiphenylamine, N-nitroso-2-nitrodiphenylamine, N-nitroso-4-nitrodiphenylamine, 2,2′-dinitrodiphenylamine, 2,4-dinitrodiphenylamine, 2,4′-dinitrodiphenylamine, 4,4′-dinitrodiphenylamine, N-nitroso-2,4′-dinitrodiphenylamine, N-nitroso-4,4′-dinitrodiphenylamine, 2,2′,4-trinitrodiphenylamine, 2,4,4′-trinitrodiphenylamine, 2,4,6-trinitrodiphenylamine, 2,2′,4,4′-tetranitrodiphenylamine, 2,2′,4,4′,6-pentanitrodiphenylamine, 2,2′,4,4′,6,6′-hexanitrodiphenylamine, and picric acid (2,4,6-trinitrophenol).

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