Pd(NHC) Electrocatalysis for Phosgene-Free Synthesis of Diphenyl Carbonate
Pd(NHC) Electrocatalysis for Phosgene-Free Synthesis of Diphenyl Carbonate
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DOI：
10.1021/cs300725j
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发表时间：
2013-03-01
期刊：
影响因子：
12.9
通讯作者：
Yamanaka, Ichiro
中科院分区：
文献类型：
--
作者：
Kanega, Ryoichi;Hayashi, Tomohiko;Yamanaka, Ichiro
在均相钯催化剂上，研究了苯酚与一氧化碳的电羰基化合成碳酸二苯酯。对不同的配体进行了筛选，发现N-杂环卡宾(NHC)基团，如1，3-二甲基咪唑-2-亚甲基对电羰化反应是有效的。由1，3-二烷基咪唑氯衍生的原位生成的NHC对电羰基化反应也是有效的，1，3-二(叔丁基)咪唑啉氯是最有效的NHC前体，对PdCl2(MeCN)(2)电催化剂有较强的给电子能力。
Electrocarbonylation of phenol with CO to diphenyl carbonate was studied using a homogeneous Pd electrocatalyst. Various ligands were screened, and N-heterocyclic carbene (NHC) groups, such as 1,3-dimesitylimidazol-2-ylidene, were found to be effective for the electrocarbonylation. An in situ-generated NHC derived from a 1,3-dialkylimidazolium chloride was also effective for the electro-carbonylation, and 1,3-di(tert-butyl)imidazoline chloride was the most effective NHC precursor, with a stronger electron donating ability to PdCl2(MeCN)(2) electrocatalyst.