Catalytic Oxidative Cracking of Benzene Rings in Water
Catalytic Oxidative Cracking of Benzene Rings in Water
复制标题
水中苯环的催化氧化裂解
DOI:
10.1021/acscatal.8b04004
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发表时间:
2019
期刊:
影响因子:
12.9
通讯作者:
T. Kojima
中科院分区:
文献类型:
--
作者:
Y. Shimoyama;T. Ishizuka;H. Kotani;T. Kojima
Efficient degradation of harmful benzene rings in water is indispensable for achieving a clean water environment. We report herein unprecedented catalytic oxidative benzene cracking (OBC) in water using a ruthenium(II)–aqua complex having anN-heterocyclic carbene ligand as a catalyst and a cerium(IV) salt as a sacrificial oxidant under mild conditions. The OBC reactions produced carboxylic acids such as formic acid, which can be converted to dihydrogen directly from the OBC solution using a rhodium(III) catalyst with adjustment of the solution pH to 3.3. The OBC reactions can be applied to monosubstituted benzene derivatives such as ethylbenzene, chlorobenzene, and benzoic acid. Initial rates of the OBC reactions showed a linear relationship in the Hammett plot with a negative slope, indicating the electrophilicity of a Ru(III)–oxyl complex as the reactive species in the catalytic OBC reaction. Also, we discuss a plausible mechanism of the catalytic OBC reactions based on the kinetic analysis and the product stoichiometry for the OBC reaction of nonvolatile sodiumm-xylene sulfonate. The addition of an electrophilic radical to the aromatic ring to form arene oxide/oxepin is proposed as the initial step of the OBC reaction.
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