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Ambireactive (R3 P)2 BH2 Groups Facilitating Temperature-Switchable Bond Activation by an Iron Complex
Lisa Vondung1, Lars E Sattler1, Robert Langer1
1Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Str. 4, 35032, Marburg, Germany.
Abstract:
An iron pincer complex containing a hemi-labile (R3 P)2 BH2 group exhibits temperature-switchable reactivity patterns: a reversible B-H activation concomitant with a P-B bond cleavage is observed at room temperature. Below 4 °C, intra- and intermolecular C-H activation pathways are becoming faster and more dominant. Mechanistic investigations reveal that the lability of the (R3 P)2 BH2 group in combination with the exothermic formation of σ-bonded complexes are responsible for the switchable bond activation. Finally, a protocol for an iron-catalyzed H/D-exchange of organic solvents in the absence of oxidants has been developed.
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