Heteroatom donor-decorated polymer-immobilized ionic liquid stabilized palladium nanoparticles: efficient catalysts for room-temperature suzuki-miyaura cross-coupling in aqueous media

Doherty, S., Knight, J. G., Backhouse, T., Abood, E., Al-shaikh, H., Clemmet, A. R., Ellison, J. R., Bourne, R. A., Chamberlain, T. W., Stones, R., Warren, N. J., Fairlamb, I. J. S. and Lovelock, K. R. J. ORCID: https://orcid.org/0000-0003-1431-269X (2018) Heteroatom donor-decorated polymer-immobilized ionic liquid stabilized palladium nanoparticles: efficient catalysts for room-temperature suzuki-miyaura cross-coupling in aqueous media. Advanced Synthesis and Catalysis, 360 (19). pp. 3716-3731. ISSN 1615-4169 doi: 10.1002/adsc.201800561

Abstract/Summary

Palladium nanoparticles stabilized by heteroatom donor‐modified polystyrene‐based polymer immobilized ionic liquids (PdNP@HAD‐PIILP; HAD‐PPh2, OMe, NH2, CN, pyrrolidone) are highly efficient catalysts for the Suzuki‐Miyaura cross‐coupling in aqueous media under mild conditions. Catalyst modified with phosphine was consistently the most efficient as it gave high yields across a range of substrates under mild conditions at low catalyst loadings. Incorporation of polyethylene glycol into the phosphine modified immobilised ionic liquid support improved catalyst efficacy by improving dispersibility and facilitating access to the active site. Moreover, each of the heteroatom modified catalysts was more active than the corresponding unsubstituted imidazolium‐based polystyrene benchmark as well as commercial samples of Pd/C. Catalyst generated in situ from either [PdCl4]@PPh2‐PIILP or its PEGylated counterpart [PdCl4]@PPh2‐PEGPIILP, by reduction with phenylboronic acid, outperformed their pre‐formed counterparts for the vast majority of substrates examined. The turnover frequency of 16,300 h−1 obtained at room temperature is one of the highest to be reported for palladium nanoparticle‐catalysed Suzuki‐Miyaura cross‐coupling between 4‐bromoacetophenone and phenylboronic acid in aqueous media under such mild conditions.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/78712
Identification Number/DOI	10.1002/adsc.201800561
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	Organic Chemistry, Catalysis
Publisher	Wiley
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