Dechlorination of chlorinated ethylenes by a photochemically generated iron(0) complex

Emily J. Pelton, David A. Blank, Kristopher McNeill

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The reactivity of Fe0 toward chlorinated ethylenes was examined utilizing a photochemically generated, highly reactive Fe0 complex. Irradiation of (dmpe)2FeH2 (dmpe = Me2PCH 2CH2PMe2) with 360 nm light generated a 16-e-, Fe0 intermediate that reacted to dechlorinate chlorinated ethylenes in a stepwise fashion, consistent with a hydrogenolysis dechlorination pathway. The source of the hydrogen atoms in the hydrogenolysis were the hydride ligands of an additional equivalent of (dmpe) 2FeH2, as evidenced by deuterium labeling experiments. The reaction was observed to be first-order in (dmpe)2FeH2, chlorinated ethylene substrate, and the intensity of 360 nm radiation. The rate of chlorinated ethylene substrate decay increased with increasing substrate chlorination in the order CH2CHCl < cis-CHClCHCl < trans-CHClCHCl < CCl2CHCl. A mechanism of reaction was proposed that accounts for the reaction kinetics, the observed intermediates, and the origin of hydrogen atoms incorporated into reaction products.

Original languageEnglish (US)
Pages (from-to)10121-10128
Number of pages8
JournalDalton Transactions
Issue number28
StatePublished - Jul 28 2013


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