Journal
ORGANOMETALLICS
Volume 35, Issue 6, Pages 847-850Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.6b00027
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- University of Bristol
- Engineering and Physical Sciences Research Council [EP/K03927X/1] Funding Source: researchfish
- EPSRC [EP/K03927X/1] Funding Source: UKRI
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Zirconium-based frustrated Lewis pairs (FLPs) are active imine hydrogenation catalysts under mild conditions. Complexes of the type [Cp(2)(R)ZrOMes][B(C6F3)(4)]-utilize the imine substrate itself as the Lewis base component of the FLP,. Catalyst performance is a function of ligand structure; in general more bulky, more electron rich cyclopentadienyl derivatives give the best results, However, Cp* derivatives are not catalytically active, being stable after initial heterolytic cleavage Of H-2; this allows experimental verification of the competence of the zirconocene-imine pair in FLP-type heterolytic H-2 cleavage. Enamines and protected nitriles are also hydrogenated if an additional internal phosphine base is used.
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