Chemistry at the Alkyne–Carbene Intersection: A Metallacyclobutene−η3‑Vinylcarbene Equilibration
datasetposted on 19.02.2016 by Joseph M. O’Connor, Kim K. Baldridge, Carmen L. Vélez, Arnold L. Rheingold, Curtis E. Moore
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Synthesis of a sterically congested metallacyclobutene complex has led to the first observation of metallacyclobutene−η3-vinylcarbene equilibration. The structure of the η3-vinylcarbene complex was elucidated by spectroscopy, HRMS, and ab initio computations. The vinylcarbene complex was trapped by reactions with ethyl diazoacetate and (C5H5)Co(PPh3)2 to give cobalt–diene and dicobalt complexes, respectively.