Brmsted acids. exhibits a 3 H singlet at 6 2.32 (Me of TsO-), a 3 H singlet at 6 2.51 (Me attached to thiophene ring), a 3 H singlet at 6 2.66 (Me of 0-tolyl group), and a 10 H" multiplet" from ca. 6 6.65 to 8.35 (aromatic hydrogens). Among the multiplets in the aromatic region, there is an obvious low-field 1 H" doublet" at 6 8.20 (0-hydrogen of tolyl group) and an obvious high-field 1 H doublet (with fine structure) at 6 6.74 (4'-hydrogen).
