Roy E. Hoffman

The structure of the vat dye pyranthrone, a regioselective double Scholl Reaction product

Abstract The structure of the vat dye pyranthrone (2), first synthesized by Scholl in 1912, formed by the double Scholl reaction (AlCl 3 /NaCl melt) of 1,6-dibenzoylpyrene (1), was verified for the first time by 1 H- and 13 C-two-dimentional correlation NMR spectroscopy in nitrob...