The average molecular weights and n.m.r. chemical shifts of the hydrogen-bonded proton of the 4-methylpyridine–dichloroacetic acid complex have been measured in toluene at 35°. The observed chemical shift can be quantitatively explained by assuming the following equilibria: 2B + 2HA ⇌ 2(BHA)⇌(BHA)2. The structure of (BHA)2 is discussed.
Z. Dega-Szafran, E. Grech, M. Z. Naskret-Barciszewska and M. Szafran, J. Chem. Soc., Perkin Trans. 2, 1975, 250 DOI: 10.1039/P29750000250
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