Common ¹H NMR impurities are listed below. Select your solvent and enter an observed shift to find which known impurities could explain it — a quick way to identify an unexpected peak.

Chemical shifts vary with solvent, concentration, temperature, and hydrogen bonding.

Data source: G. R. Fulmer, A. J. M. Miller, N. H. Sherden, H. E. Gottlieb, A. Nudelman, B. M. Stoltz, J. E. Bercaw, K. I. Goldberg, Organometallics 2010, 29, 2176–2179.