Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 18, Pages 5161-5165Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201713240
Keywords
cage compounds; carbenes; photochemical cycloaddition; supramolecular chemistry; template synthesis
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Funding
- NSFC [21722105, 21371036]
- FM and EM International Joint Laboratory of Northwest University Xi'an
- DFG [SFB 858, IRTG 2027]
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A procedure for the synthesis of three-dimensional hexakisimidazolium cage compounds has been developed. The reaction of the trigonal trisimidazolium salts H3L(PF6)(3), decorated with three N-olefinic pendants, and silver oxide yielded trinuclear trisilver(I) hexacarbene molecular cylinders of the type [Ag3L2](3+) with the olefinic pendants from the two different tricarbene ligands arranged in three pairs. Subsequent UV irradiation gave three cyclobutane links between the two tris-NHC ligands in three [2+2] cycloaddition reactions, thereby generating a three-dimensional hexakis-NHC ligand. Removal of the metal ions resulted in the formation of three-dimensional hexakisimidazolium cages with a large internal cavity.
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