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The two 3-deoxy-D-hexosones, 3-deoxy-D-erythrohexosone and 3-deoxy-D-threohexosone, were quantitatively converted by acid to 5-(hydroxymethyl)-2-furaldehyde.The mechanism of the formation of 2-furaldehyde from sugars is discussed. Calcium hydroxide rapidly converted 3-deoxy-D-erythrohexosone to a- and ß-glucometasaccharinic acids, and 3-deoxy-D-threohexosone to a- and ß-galactometasaccharinic acids.
EFLJ Anet (1961) studied this question.