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Logic Puzzle #7: Almost Missed It

When dealing with small sample concentrations of an unknown compound, the NMR region where a large solvent signal appears rarely gets a second look. However, a large NMR signal can easily obscure a small signal. From one elucidator to another, check the solvent signal for any structural signals.

In the 13C [1H] NMR spectrum below, how many signals are present?

Logic#7PeakOverlapCDCl3_13Ca_Sept132010

If the spectrum is zoomed in, how many signals can be seen now?

Logic#7PeakOverlapCDCl3_13Cb_Sept132010