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Highly Selective Semihydrogenation of Alkynes to Alkenes by Using an Unsupported Nanoporous Palladium Catalyst: No Leaching of Palladium into the Reaction Mixture
ACS Catalysis ( IF 12.9 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acscatal.7b02915
Ye Lu 1 , Xiujuan Feng 1 , Balaram S. Takale 1 , Yoshinori Yamamoto 1, 2, 3 , Wei Zhang 4 , Ming Bao 1, 5
Affiliation  

We report the highly chemoselective and stereoselective semihydrogenation of alkynes to Z-internal and terminal alkenes by using unsupported nanoporous palladium (PdNPore) as a heterogeneous catalyst under mild reaction conditions (room temperature and 1 atm of H2). The semihydrogenation of various terminal/internal and aromatic/aliphatic alkynes afforded the corresponding alkenes in good chemical yields with high selectivities. PdNPore further showed high chemoselectivity toward terminal alkynes in the presence of internal alkynes, which has not yet been achieved using supported palladium nanoparticle catalysts. H–H heterolysis of H2 on the surface of PdNPore was strongly suggested by deuterium labeling experiments. No Pd leached from PdNPore during the reaction, and the catalyst was easily recovered and reused without a loss of activity.

中文翻译:

通过使用无载体的纳米多孔钯催化剂将炔烃高度选择性地半氢化为烯烃:不会将钯浸出到反应混合物中

我们通过在温和的反应条件(室温和1 atm的H 2)下使用无支撑的纳米多孔钯(PdNPore)作为多相催化剂,将炔烃高度化学选择性和立体选择性半氢化成Z-内部和末端烯烃。各种末端/内部和芳族/脂肪族炔烃的半氢化反应以良好的化学收率和高选择性提供了相应的烯烃。在存在内部炔烃的情况下,PdNPore进一步显示出对末端炔烃的高化学选择性,这尚未使用负载型钯纳米粒子催化剂实现。H 2的H–H杂解氘标记实验强烈建议在PdNPore表面进行修饰。在反应期间,没有Pd从PdNPore中浸出,并且催化剂易于回收和再利用而不会损失活性。
更新日期:2017-11-08
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