Abstract
Novel compounds related to leuco-monoaminonaphthoquinones derived from naphthazarin were synthesized. These leuco-compounds were stable even in aerated solvents. Their structures in tautomeric isomers were definitely elucidated by 1H, 13C-NMR spectroscopies. The assignment of 13C-NMR was achieved by 1H, 13C long range selective proton decoupling (LSPD) method. The structure of leuco-compound of naphthazarin was confirmed to be 2, 3-dihydro-5, 8-dihydroxynaphthalene-1, 4-dione. The structures of leuco-compounds of 2-butylaminonaphthazarin and 5-butylamino-8-hydroxynaphthoquinone were revealed to be 6-butylamino-2, 3-dihydro-5, 8-dihydroxynaphthalene-1, 4-dione and 5-butylamino-2, 3-dihydro-8-hydroxynaphthalene-1, 4-dione, respectively.
