The crystalline dilactone (IV) of D-glucosaccharic acid (I) derived from both 1, 4-lactone (II) and 3, 6-lactone (III) was found to be identical, and its structure was established as 1, 4-3, 6-dilactone. It was confirmed that the rapid mutarotation of IV in aqueous solution was attributable to the instability of its 1, 4-γ-lactone ring.
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Hirasaka et al. (1965) studied this question.