Various aminoanthraquinones can be easily prepared from (tosy1oxy)anthraquinone precursors. Unsymmetrical 1,4diaminoanthraquinones are prepared via the intermediate monoamino mono(tosy1oxy)anthraquinones derived from 1,4-bis(tosyloxy)anthraquinone. The ability to remove tosylate groups sequentially is controlled by the proper selection of solvent and temperature. Hindered 1,4-diamino and 1-aminoanthraquinones are prepared from their corresponding tosyl derivatives, and the amount of steric hindrance present can be successfully correlated with spectral and color data. The methods described offer advantages over the literature preparations of these compounds.
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