Abstract
AbstractThe dehalogenative polycondensation of 3,6‐dibromo‐N‐ethylcarbazole was catalyzed by a Ni(0)‐based complex, generated in N,N‐dimethylacetamide by electroreduction of NiBr2/2,2′‐bipyridine. The process involves three different successive reaction steps: electrolysis of Ni(II) to Ni(0); insertion of the latter into a CBr bond of monomer leading to CNiBr* active species; dehalogenative coupling between active sites and monomer, yielding oligomers. From kinetics of electrogeneration of the catalytic system in the absence of monomer, a first‐order reaction was determined. Insertion and coupling reactions were found to be second order, and comparison of the values of the corresponding rate constants clearly showed that couplings is the rate‐determining step of the process.
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