Synthesis and redox catalysis of Carbodiphosphorane ligated stannylene
Zhuchunguang Liu, Zhijun Wang, Huan Mu, YG Zhou, Jiliang Zhou, Zhaowen Dong
Abstract
Heavier group 14 carbene analogues, exhibiting transition-metal-like behavior, display remarkable capability for small molecule activation and coordination chemistry. However, their application in redox catalysis remains elusive. In this paper, we report the synthesis and isolation of a stannylene with carbodiphosphorane ligand. The nucleophilic reactivity at the divalent tin center is elucidated by computational and reactivity studies. Moreover, this stannylene exhibits catalytic activity in the hydrodefluorination reaction of fluoroarenes. Mechanistic investigations into the elementary steps confirm a SnII/SnIV redox cycle involving C–F oxidative addition, F/H ligand metathesis, and C–H reductive elimination. This low-valent SnII catalytic system resembles the classical transition metal catalysis. Notably, this represents metallomimetic redox catalysis utilizing carbene analogue with heavier group 14 element as a catalyst. Heavier group 14 carbene analogue display remarkable capability for small molecule activation but their application in redox catalysis remains elusive. Here, the authors report the synthesis and isolation of a stannylene with carbodiphosphorane ligand and characterize its catalytic activity in the hydrodefluorination reaction of fluoroarenes.