Coughlin, Omar and Krämer, Tobias and Benjamin, Sophie L. (2020) Diverse structure and reactivity of pentamethylcyclopentadienyl antimony(iii) cations. Dalton Transactions, 49 (6). pp. 1726-1730. ISSN 1477-9226

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Abstract

The pentamethylcyclopentadienyl (Cp*) antimony(III) cations [Cp*2Sb][B(C6F5)4], [Cp2*Sb][OTf], [Cp*SbCl][B(C6F5)4] and [Cp*Sb][OTf]2 have been isolated and structurally characterised. [Cp*SbCl]+ forms dimers in the solid state via an intermolecular Sb–Cl interaction. Initial screening shows that [Cp*SbCl][B(C6F5)4] is significantly Lewis acidic and can catalyse the dimerisation of 1,1-diphenylethylene; [Cp2*Sb][B(C6F5)4] exhibits negligible Lewis acidity. Highly unstable [Cp*SbF][B(C6F5)4] could not be isolated, but stabilisation with the IMes ligand allowed isolation of [Cp*SbF(IMes)][B(C6F5)4]. Fluorodechlorination of CH2Cl2 and PhCCl3 was observed in the presence of crude [Cp*SbF][B(C6F5)4] in solution. A computational mechanistic investigation suggests that the latter proceeds via a carbocation intermediate.

Item Type:	Article
Keywords:	Diverse structure; reactivity; pentamethylcyclopentadienyl; antimony(iii); cations;
Academic Unit:	Faculty of Science and Engineering > Chemistry Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Item ID:	15536
Identification Number:	https://doi.org/10.1039/d0dt00024h
Depositing User:	Tobias Kraemer
Date Deposited:	21 Feb 2022 16:30
Journal or Publication Title:	Dalton Transactions
Publisher:	Royal Society of Chemistry
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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