2,3-dihydroxybutanediamide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.80 g of (+)-tartaric acid diamide (VI) and 1.44 g of naphthol (α:β=1 : 1) were dissolved in 10 ml of methanol by heating, and the thus-obtained solution was allowed to stand for 12 hours at room temperature, with 2.3 g of a clathrate compound (colorless needle-like crystal, mp. 199-204° C.) containing tartaric acid diamide (VI) and 8 -naphthol in a ratio of 1 : 1 being crystallized. When the tartaric acid diamide (VI) was separated from the clathrate compound by column chromatography, 0.53 g of β-naphthol was obtained. (Function and Effect of the Invention) by heating being crystallized When the tartaric acid diamide (VI) was separated from the clathrate compound by column chromatography