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(A) Isomerization of 4 to 6 is monitored with a UV−vis spectrophotometer. (B) Oxidative addition complex, 4, isomerizes into a 2,2′-di(pyrrolin-2-yl)biphenyl nickel(II) bromide, 6, in polar solvents. Crystal structures of the complex 6 is shown on the right. Carbons are shown in gray, nitrogens in purple, bromides in yellow, and nickel in green. Isosbestic points are seen at around 300, 340, and 500 nm.
