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CO2 insertion at Ni(I). (top) Anion metathesis reaction (left) and CO2 insertion into 3 (right). (bottom) Changes in the 77 K X-band EPR spectra of 1-Cl (left, gx = 2.084, gy = 2.119, gz = 2.461) after anion metathesis and after CO2 insertion at 3 (right, gx = 2.065, gy = 2.145, gz = 2.519) to form 5 (center, gx = 2.299, gy = 2.272, gz = 2.064).
