(+-)-Pantolactone → Keto-pantoyllactone

Beteiligte Stoffe

Reaktionsschritte

5 g (38.4 mmol) of pantolactone were reacted with 3.6 g (15.5 mmol) of trichloroisocyanuric acid as described in Example 13. In contrast to Example 13, 63 mg (0.24 mmol) of Tempo derivative D were used as the catalyst. The reaction had finished after 1 hour. After recrystallization of the crude product there were obtained 4.85 g (98%) of ketopantolactone, m.p. 68°-69° C., GC content: 100% (area percent).

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