2,2',4,4'-Tetrabromodiphenylamine (1) and its N-alkyl derivatives 9available by alkylation of 2,2',4,4'-tetrabromodiphenylamine) are important intermediates for the synthesis of phenazasiline compounds which possess excellent high-temperature stability coupled with antioxidant activity; these properties make them useful as antioxidants for high-temperature lubricants.
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