A quaternary ammonium Hoveyda-Grubbs metathesis pre-catalyst was made in one step from the commercially available second generation Grubbs catalyst, before electrostatic immobilization onto magnetic iron oxide particles. The resulting catalyst provided pseudo-homogeneous reactivity but coupled with an easy recovery option. The catalyst could simply be magnetically retrieved from the reaction media and the catalyst reused up to six times.
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Electrostatic immobilization of an olefin metathesis pre-catalyst on iron oxide magnetic particles, Matthew J. Byrnes, Andrew M. Hilton, Clint P. Woodward, William R. Jackson and Andrea J. Robinson, Green Chem., 2012, DOI: 10.1039/C1GC16084B
