Not only the hydrophobicity of the sugar to be complexed determines the strength of its bond to β‐cyclodextrin. Steric factors also play a large role. In water, aldopentoses are bound better as their hydrophobicity increases, but aldohexoses do not form complexes with β‐cyclodextrin even though some are clearly more hydrophobic than all the pentoses studied. This is the first example of a selective oligosugar–sugar interaction in water.
Nicht nur die Hydrophobie des zu komplexierenden Zuckers ist für die Stärke seiner Bindung an β‐Cyclodextrin entscheidend, sondern auch seine sterichen Ansprüche spielen eine große Rolle. So werden in Wasser Aldopentosen zwar mit steigender Hydrophobie besser gebunden, Aldohexsen dagegen, obwohl zum Teil deutlich hydrophober als die untersuchten Pentosen, werden nicht durch β‐Cyclodextrin komplexiert. Dies ist das erste Beispiel für eine selektive Oligozucker‐Zucker‐Wechselwirkung in Wasser.
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