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- W2017992062 abstract "Two imidazolium-bridged cyclodextrin dimers 3a and 3b were prepared by reacting 6-deoxy-6-N-imidazolyl-β-CD (2) with bis(bromomethyl) benzene. The catalytic properties of 2, 3a and 3b in the hydrolytic cleavage of p-nitrophenyl alkanoates, in the form of acetate (PNPA), butanoate (PNPB), hexanoate (WH) and octanoate ( PNPO), were examined. CD dimers showed middling rate enhancements around neutrality. Catalytic rate constants ( kc) in the presence of 3a or 3b did not vary much with chain length of esters. In contrast, dissociation constants (Kd) and selectivity factors (kc/Kd) for “long-chain” esters were much smaller and significantly larger than those for “short-chain” ones respectively, indicating CD dimers 3a and 3b have good dimensional recognition ability and substrate selectivity in the hydrolytic cleavage of p-nitrophenyl alkanoate. Their kinetic consequences are briefly interpreted." @default.
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- W2017992062 date "2010-08-27" @default.
- W2017992062 modified "2023-09-27" @default.
- W2017992062 title "Syntheses of imidazolium-bridged cyclodextrin dimers and their catalytic properties in the hydrolytic cleavage of p-nitrophenyl alkanoates" @default.
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- W2017992062 doi "https://doi.org/10.1002/cjoc.19990170411" @default.
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