PARUCH, Kamil, Libor VYKLICKÝ, Thomas KATZ, Christopher INCARVITO and Arnold RHEINGOLD. Expeditious Procedure To Synthesize Ethers and Esters of Tri- and Tetrahydroxy[6]helicenebisquinones from the Dye-Intermediates Disodium 4-Hydroxy- and 4,5-Dihydroxynaphthalene-2,7-disulfonates.
Journal of Organic Chemistry. 2000, vol. 2000, No 65, p. 8774-8782. ISSN 0022-3263.