Abstract
A new Janus-type cyclodextrin (CD) molecular tube bearing seven triisopropylsilyl (TIPS) groups at one end is synthesized from a heptakis(6-O-triisopropylsilyl)-β-cyclodextrin (TIPS-β-CD) dimer possessing multiple linkers through the selective removal of seven TIPS groups at the other end. This Janus-type CD tube exhibits a selective inclusion ability for a cis-fatty acid ester over the corresponding trans-fatty acid ester. In addition, the CD tube shows a twofold higher inclusion ability for unsaturated fatty acid esters than the corresponding CD tube bearing seven tert-butyldimethylsilyl (TBDMS) groups, indicating that the molecular size of the terminal substituents remarkably affects the inclusion ability of the CD tube.
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