Bonding and Reactivity in Terminal versus Bridging Arenide Complexes of Thorium Acting as Th<sup>II</sup> Synthons
Fang‐Che Hsueh, Thayalan Rajeshkumar, Bastiaan Kooij, Rosario Scopelliti, Kay Severin, Laurent Maron, Ivica Živković, Marinella Mazzanti
Abstract
Abstract Thorium redox chemistry is extremely scarce due to the high stability of Th IV . Here we report two unique examples of thorium arenide complexes prepared by reduction of a Th IV ‐siloxide complex in presence of naphthalene, the mononuclear arenide complex [K(OSi(O t Bu) 3 ) 3 Th(η 6 ‐C 10 H 8 )] ( 1 ) and the inverse‐sandwich complex [K(OSi(O t Bu) 3 ) 3 Th] 2 (μ‐η 6 ,η 6 ‐C 10 H 8 )] ( 2 ). The electrons stored in these complexes allow the reduction of a broad range of substrates (N 2 O, AdN 3 , CO 2 , HBBN). Higher reactivity was found for the complex 1 which reacts with the diazoolefin IDipp=CN 2 to yield the unexpected Th IV amidoalkynyl complex 5 via a terminal N‐heterocyclic vinylidene intermediate. This work showed that arenides can act as convenient redox‐active ligands for implementing thorium‐ligand cooperative multielectron transfer and that the reactivity can be tuned by the arenide binding mode.