A general synthesis of 2,6- and 3,6-dialkyl-8-amino-1,4,5-trihydroxy- and the related tetrahydroxyquinones was developed from 2- and 3-alkyl-1,4,5-trihydroxyanthraquinones via nitration, reduction, aldol condensation, and hydrolysis. The utility of these as dichroic dyestuffs was estimated by measurement of the order parameter, S.
A. Kumar, J. K. Sutherland and D. J. Thompson, J. Chem. Soc., Perkin Trans. 1, 1987, 445 DOI: 10.1039/P19870000445
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