Metal-Silicon Triple Bonds: Access to [Si(η5-C5Me5)]+ from SiX2(NHC) and its Conversion to the Silylidyne Complex [TpMe(CO)2MoSi(η3-C5Me5)] (TpMe = κ3- N, N ′, N ″-hydridotris(3,5-dimethyl-1-pyrazolyl)borate)

Priyabrata Ghana, Marius I. Arz, Gregor Schnakenburg, Martin Straßmann, Alexander C. Filippou*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

35 Citations (Scopus)

Abstract

A novel method to prepare SiCp∗2 (1) (Cp∗ = C5Me5) is presented involving the reaction of N-heterocyclic carbene (NHC)-stabilized SiII halides SiX2(NHC) (X = Cl, Br) with 2 equiv of KCp∗. This route is a superior alternative to the laborious, multistep synthesis of 1 presently known and provides via the selective protonolysis of 1 with [H(Et2O)2][B(C6F5)4] facile access to [Si(η5-Cp∗)][B(C6F5)4] (2) in multigram scale and high yield. Reaction of 2 with the tailored metallate Na[TpMeMo(CO)2(PMe3)] afforded the unprecedented silylidyne complex [TpMe(CO)2MoSi(η3-Cp∗)] (3; TpMe = κ3-N,N′,N″-hydridotris(3,5-dimethyl-1-pyrazolyl)borate). Single crystal X-ray diffraction and spectroscopic studies in combination with quantum chemical calculations shed light on the unique bonding situation of 3 featuring a delocalized Mo-Si bond with partial triple bond character and a Cp∗ substituent, which is η3-coordinated to silicon.

Original languageEnglish
Pages (from-to)772-780
Number of pages9
JournalOrganometallics
Volume37
Issue number5
DOIs
Publication statusPublished - 12 Mar 2018

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