The H-1 and C-13 NMR resonances for 18 tetracyclic acridines 9-substituted
on the acridine ring with Cl, NH2 and AMS [N-(4-amino-3-methoxyphenyl)1meth
ane-sulfonamide] groups were completely and unequivocally assigned by the c
oncerted application of gs-HMQC and gs-HMBC experiments. For NH2 and AMS su
bstituents, the potential amino-imino tautomerism is completely shifted tow
ards the imino tautomer. Copyright (C) 2001 John Wiley & Sons, Ltd.