A highly removable N-heterocyclic carbene ligand for a transition-metal catalyst in aqueous media via host–guest interactions has been developed. Water-soluble adamantyl tethered ethylene glycol in the ligand leads a hydrophobic inclusion into the cavity of β-cyclodextrin. Ruthenium (Ru) olefin metathesis catalyst with this ligand demonstrated excellent performance in various metathesis reactions in water as well as in CH₂Cl₂, and removal of residual Ru was performed via filtration utilizing a host–guest interaction and extraction.

中文翻译：

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通过宿主-客体相互作用可移动的水溶性烯烃复分解催化剂

通过主客体相互作用，开发了一种高度可除去的N-杂环卡宾配体，用于水性介质中的过渡金属催化剂。配体中的水溶性金刚烷基链状乙二醇将疏水性包裹物引入β-环糊精的空腔中。具有这种配体的钌（Ru）烯烃复分解催化剂在水中以及在CH ₂ Cl ₂中的各种复分解反应中均表现出出色的性能，并且通过利用主体与客体之间的相互作用和萃取进行过滤来去除残留的Ru。