The infrared spectra of 15 aliphatic and aromatic zinc sulfinates are given. With zinc <i>p</i>-toluene-sulfinate, run neat as an extremely thin, flat crystal, the symmetric and asymmetric <i>S</i> → 0 peaks were clearly visible at 10.1 μ (990 cm<sup>−1</sup>) and 10.6 μ (943 cm<sup>−1</sup>), respectively, and similar absorptions were obtained for the other sulfinates run as Nujol mulls. In distinction to sulfonic acid salts, the sulfinates have practically no absorption in the 8-9 μ (1250-1110 cm<sup>−1</sup>) region, whereas the sulfonates have no absorption in the 10-11 μ (1000-910 cm<sup>−1</sup>) thus indicating the analytical value of the spectra in distinguishing these two groups of compounds.

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