New method for the preparation of activated nickel and cobalt powders and their application in biaryl synthesis

CS Chao, CH Cheng, CT Chang

Index: Chao, C. S.; Cheng, C. H.; Chang, C. T. Journal of Organic Chemistry, 1983 , vol. 48, # 25 p. 4904 - 4907

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Citation Number: 43

Abstract

An activated nickel powder has been prepared by the procedure of electrolysis of a NiS04 aqueous solution with Hg as the cathode to form a nickel amalgam followed by the removal of the mercury from the amalgam at 150 OC and torr. The nickel powder, similar to Cu in Ullmann's biaryl synthesis, has been found to react with aryl iodide and aryl bromide at 140 OC to give biaryls in good yields and with dibromobenzene to yield a number of ...