Vacuum-Driven Anionic Ligand Exchange in a Ruthenium Complex

doi:10.1055/s-2007-991223

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Synfacts 2007(11): 1212-1212
DOI: 10.1055/s-2007-991223

Polymer-Supported Synthesis

Vacuum-Driven Anionic Ligand Exchange in a Ruthenium Complex

Contributor(s): Yasuhiro Uozumi, Yohei Oe
D. C. Braddock*, K. Tanaka, D. Chadwick, V. P. W. Böhm, M. Roeper
Imperial College London, UK and BASF AG, Ludwigshafen, Germany

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Publikationsdatum:
23. Oktober 2007 (online)

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Significance

A new protocol for the immobilization of ruthenium-benzylidene complexes by polymeric perfluorocarboxylic acid was described. Thus, polymer-supported perfluorocarboxylic acid 2 was prepared from 4-bromopolystyrene 1 via metal-halogen exchange with i-Pr(n-Bu)₂MgLi and subsequent treatment with hexafluoroglutaric anhydride. Vacuum-driven anionic ligand exchange reaction of 2 with ruthenium-benzylidene complex 3 was carried out in mesitylene under reduced pressure (ca. 20 mmHg) to afford the polymer-supported ruthenium-benzylidene complex 4. Ring-closing metathesis of diethyl diallylmalonate 5 in the presence of 4 in CD₂Cl₂ gave cyclopentene 6 with 100% conversion.