Journal
ACS CATALYSIS
Volume 10, Issue 14, Pages 7573-7583Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c02023
Keywords
frustrated Lewis pair; hydrogen activation; anion; tin; stannylium
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Funding
- Imperial College
- EPSRC [EP/N026004, EP/N509486/1]
- Royal Society [UF/160395]
- NKFIH [K-115660]
- EPSRC [EP/N026004/1] Funding Source: UKRI
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Cationic Lewis acids (LAs) are gaining interest as targets for frustrated Lewis pair (FLP)-mediated catalysis. Unlike neutral boranes, which are the most prevalent LAs for FLP hydrogenations, the Lewis acidity of cations can be tuned through modulation of the counteranion; however, detailed studies on such anion effects are currently lacking in the literature. Herein, we present experimental and computational studies which probe the mechanism of H-2 activation using iPr(3)SnOTf (1-OTf) in conjunction with a coordinating (quinuclidine; qui) and non-coordinating (2,4,6-collidine; col) base and compare its reactivity with {iPr,Sn.base}{Al[OC(CF3)(3)](4)} (base = qui/col) systems which lack a coordinating anion to investigate the active species responsible for H-2 activation and hence resolve any mechanistic roles for OTf- in the iPr(3)SnOTf-mediated pathway.
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