1, 3-oxazolireports the tautomeric equilibria were studied with the aid of molec-ular refraction, IR and UV spectroscopy. lV2 These methods cannot result in exact tautomer ratios. It has been found that the products from 3-aminopropanol and carbonyl compounds appear in a higher ratio of cyclic vs. chain structures than those from 2-aminoethanol and carbonyl compounds! In both cases the relative amount of the ring form was increased by ...