Homobimetallic bis-NHC(Ptdvtms)2 Complexes for the Hydrosilylation of Alkenes

Michael J. Sauer, Jeff Offorjindu, Greta G. Zámbó, Robert M. Reich, Fritz E. Kühn

Research output: Contribution to journalArticlepeer-review

Abstract

A series of six bimetallic bis-NHC(Ptdvtms)2 complexes 1–6 (dvtms = 1,1,3,3-tetramethyl-1,3-divinyldisiloxane) has been designed by expansion of the monometallic Markó-type system in anticipation of synergistic bimetallic cooperation. The new compounds are easily accessible using Karstedt's catalyst [Pt2(dvtms)3] as platinum(0) precursor and the respective bis-(imidazolium) salts (L1–6), deprotonated by potassium tert‑butoxide. Characterization via NMR spectroscopy (1H, 13C, 29Si, 195Pt) and SC-XRD reveals a strong similarity of this new complex class to the parent monometallic complexes. The hydrosilylation reactions of oct-1-ene or 1,1,1,3,3-pentamethyl-3-vinyldisiloxane (MMVi) with 1,1,3,5,5-heptamethyltrisiloxane (MDHM), respectively, are efficiently and selectively catalyzed with turn-over frequencies (TOF) of up to 78,000 h–1 after a significantly shortened induction period compared to their monometallic relatives. Mercury poisoning experiments demonstrate the superiority of bimetallic compared to monometallic systems in terms of stability when exposed to silanes.

Original languageEnglish
Article number123030
JournalJournal of Organometallic Chemistry
Volume1007
DOIs
StatePublished - 1 Mar 2024

Keywords

  • Bimetallic
  • Induction period
  • Mercury poisoning
  • N-heterocyclic carbenes
  • Platinum
  • Silanes

Fingerprint

Dive into the research topics of 'Homobimetallic bis-NHC(Ptdvtms)2 Complexes for the Hydrosilylation of Alkenes'. Together they form a unique fingerprint.

Cite this