Abstract: | The signal identifications of isobenzopyrylium salts has been achieved on the basis of proton broad-band and off-resonance decoupled 13C n.m.r. spectra of twelve different 1-arylisobenzopyrylium salts and eight model compounds. From the 13C shifts valuable information about pK values, the aromatic character and the conjugative effects of isobenzopyrylium salts was obtained. |