In der vorigen Mitteilung 1) wurde ein neuer Zuckerabbau durch Fragrnentierung acylierter Peroxyglykoside beschrieben. Diese erhielten wir aus den acylierten Glykosylhalogeniden und tert.-Butylhydroperoxid.Es wurde bereits mitgeteilt I ) , daR aus a-Acetobromglucose (1) und tert.-Butylhydroperoxid sowohl das acetylierte tert.-Butylperoxyglucosid 2 als auch der acetylierte Glucose-1.2-tert.-butylperoxyorthoester 3 entstehen konnen.Wir haben von verschiedenen Zuckern 1.2-Peroxyorthoester dargestellt und das chemische Verhalten dieser neuen Verbindungsklasse untersucht.
The conditions for the introduction of active carbonate groups into supports containing hydroxyl groups by reaction with 5-norbornene-2.3-dicarboximido carbonochloridate are described. Up to 1.5 mmol carbonate groups/g dry Sepharose 4B could be bound. In the case of glycine the reaction of the activated supports with the amino groups takes place with a 10-fold higher rate than the hydrolysis of the carbonate groups, and high coupling yields can be reached. It is shown that the activated supports are well suitable for the preparation of carriers for affinity chromatography or the immobilization of enzymes.
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