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Logic Puzzle # 19: Can you spot the solvent?

August 10, 2011

Residual solvents are typically organic volatile chemicals that are not completely removed from the sample. Many residual solvents exhibit a characteristic pattern when examined via NMR. The goal of this puzzle is to identify a residual solvent by NMR.

The aliphatic region of the 1H NMR spectrum below is for an unknown acquired in CDCl3. Are any residual solvents evident?

5 Replies to “Logic Puzzle # 19: Can you spot the solvent?”

  1. Perhaps, it is ethanol. 3.5 ppm quartet of the methylene protons and 1-0.9 ppm triplet of the methyl protons. The ratio of integral intensities for these signals (2:3) agrees with this guess.

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