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- W2036768242 endingPage "3771" @default.
- W2036768242 startingPage "3762" @default.
- W2036768242 abstract "The synthesis of catenanes and rotaxanes using the hard trivalent transition metal ion cobalt(III) as a template is reported. Tridentate dianionic pyridine-2,6-dicarboxamido ligands, each with two terminal alkene groups, coordinate Co(III) in a mutually orthogonal arrangement such that entwined or interlocked molecular architectures are produced by ring-closing olefin metathesis. Double macrocyclization of two such ligands bound to Co(III) afford a non-interlocked figure-of-eight complex in 42% yield, the structure determined by X-ray crystallography. Preforming one macrocycle and carrying out a single macrocyclization of the second bis-olefin with both ligands attached to the Co(III) template led to the isomeric [2]catenate in 69% yield. The mechanically interlocked structure was confirmed by X-ray crystallography of both the Co(III) catenate and the metal-free catenand. A Co(III)-template [2]rotaxane was assembled in 61% yield by macrocyclization of the bis-olefin ligand about an appropriate dianionic thread. For both catenanes and rotaxanes, removal of the metal ion via reduction under acidic conditions to the more labile Co(II) gave neutral interlocked molecules with well-defined co-conformations stabilized by intercomponent hydrogen bonding." @default.
- W2036768242 created "2016-06-24" @default.
- W2036768242 creator A5031865138 @default.
- W2036768242 creator A5049970193 @default.
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- W2036768242 creator A5081992710 @default.
- W2036768242 creator A5083249646 @default.
- W2036768242 creator A5088776008 @default.
- W2036768242 date "2009-02-24" @default.
- W2036768242 modified "2023-09-25" @default.
- W2036768242 title "Getting Harder: Cobalt(III)-Template Synthesis of Catenanes and Rotaxanes" @default.
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