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Synfacts 2007(11): 1212-1212
DOI: 10.1055/s-2007-991223
DOI: 10.1055/s-2007-991223
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart · New York
Vacuum-Driven Anionic Ligand Exchange in a Ruthenium Complex
D. C. Braddock*, K. Tanaka, D. Chadwick, V. P. W. Böhm, M. Roeper
Imperial College London, UK and BASF AG, Ludwigshafen, Germany
Further Information
Publication History
Publication Date:
23 October 2007 (online)
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.