The stability of imine-containing dynamic [2]rotaxanes to hydrolysist
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摘要Large amounts (> 100 mol equivalents) of water are required to effect by hydrolysis the partial disassembly of the rings from the dumbbell components of two dynamic [2]rotaxanes. The two dynamic [2]rotaxanes are comprised of [24]crown-8 rings-each of which incorporate two imine bonds-encircling a dumbbell component composed of a dibenzylammonium ion in which each of the two benzyl substituents carries two methoxyl groups attached to their 3- and 5-positions. A mechanism for the partial disassembly of the two dynamic [2]rotaxanes, involving the cleavage of the kinetically labile imine bonds by water molecules, is proposed. The most important experimental observation to be noted is the fact that the hydrolysis of the macrocyclic diimines, associated with the templating -CH2NH2+CH 2-centres in the middle of their dumbbells, turns out to be an uphill task to perform in the face of the molecular recognition provided by strong [N+-H ⋯ O] hydrogen bonds and weaker, yet not insignificant, [C-H ⋯ O] interactions. The dynamic nature of the imine bond formation and hydrolysis is such that the acyclic components produced during hydrolysis of the imine bonds can be enticed to cyclise once again around the -CH 2NH2+CH2-template, affording the [2]rotaxanes. The reluctance of imine bonds, present in substantial numbers in larger molecular and extended structures, is significant when it comes to exercising dynamic chemistry in compounds where multiple imine bonds are present. © The Royal Society of Chemistry 2010.
著者Leung K.C.-F., Wong W.-Y., Arico F., Haussmann P.C., Fraser Stoddart J.
期刊名稱Organic and Biomolecular Chemistry
出版年份2010
月份2
日期23
卷號8
期次1
出版社Royal Society of Chemistry
出版地United Kingdom
頁次83 - 89
國際標準期刊號1477-0520
電子國際標準期刊號1477-0539
語言英式英語

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