1. The group of 2-hydroxyglycals, the first member of which, 2-hydroxy-D-glucal, was diSocvered by K. Maurer in 1927 is not included in the present review. The numerous researches on these substances merit a separate review of this active field in which the reactions are in general rather different from those of the glycals
2. Über das Glucal und seine Umwandlung in neue Stoffe aus der Gruppe des Traubenzuckers