Cyclic voltammetry and preparative-scale electrochemical studies on the intramolecular cyclization of allyl 2-halophenyl ethers catalyzed by Ni(II)−cyclam complexes leads us to propose a mechanism involving Ni(I) and Ni(III) intermediate species. The role of Mg 2+ ions in the reactivity and selectivity of the process is discussed. The Ni(cyclam)Br 2 -catalyzed electrosynthesis of dihydrobenzofurans and dihydrobenzopyrans from unsaturated side-chain aryl halide derivatives is effected in good yields in the presence of a magnesium anode.
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Olivero et al. (1998) studied this question.