Ni(<scp>i</scp>)–Ni(<scp>iii</scp>) cycle in Buchwald–Hartwig amination of aryl bromide mediated by NHC-ligated Ni(<scp>i</scp>) complexes

Abstract

NHC-ligated Ni(<sc>i</sc>) intermediates in Buchwald–Hartwig amination of aryl halides were isolated and determined. The presence of a Ni(<sc>iii</sc>) intermediate was also indicated at low temperature.