Cyclometalated Ruthenium Pincer Complexes as Catalysts for the α-Alkylation of Ketones with Alcohols

Patrick Piehl, Roberta Amuso, Elisabetta Alberico, Henrik Junge, Bartolo Gabriele, Helfried Neumann, Matthias Beller

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Ruthenium PNP pincer complexes bearing supplementary cyclometalated C,N-bound ligands have been prepared and fully characterized for the first time. By replacing CO and H as ancillary ligands in such complexes, additional electronic and steric modifications of this topical class of catalysts are possible. The advantages of the new catalysts are demonstrated in the general α-alkylation of ketones with alcohols following a hydrogen autotransfer protocol. Herein, various aliphatic and benzylic alcohols were applied as green alkylating agents for ketones bearing aromatic, heteroaromatic or aliphatic substituents as well as cyclic ones. Mechanistic investigations revealed that during catalysis, Ru carboxylate complexes are predominantly formed whereas neither the PNP nor the CN ligand are released from the catalyst in significant amounts.

Original languageEnglish
Pages (from-to)6050-6055
Number of pages6
JournalChemistry - A European Journal
Volume26
Issue number27
DOIs
StatePublished - 12 May 2020
Externally publishedYes

Keywords

  • C−C bond formation
  • hydrogen autotransfer
  • metallacycles
  • pincer complexes
  • ruthenium

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