In this study, we report the synthesis of a highly stable, magnetically retrievable gold and palladium nanocatalyst ([email protected]), highly active in Suzuki cross-coupling and related homocoupling reactions. The active catalytic component in this system is palladium, which can only be stabilized in the presence of gold nanoparticles. There is no significant loss of activity even after prolonged storage exposed air and moisture. The versatile nature [email protected] is demonstrated through the selective catalysis of the homocoupling of phenylboronic acid under low concentrations of O₂ and the oxidation of phenylboronic acid to phenol under high O₂ concentrations. [email protected] also demonstrated Ullmann-type homocoupling of 4-iodotolene with excellent yields. The magnetically retrieved catalyst could be re-used up to six times in Suzuki–Miyaura cross-coupling with consistently high activity and with a minimal loss of the noble metal species. Through these reactions we show that the gold-stabilized [email protected] can be used as stable and recyclable palladium reservoir for multiple palladium-catalysed reactions.

在这项研究中，我们报告了一种高度稳定的，可磁性回收的金和钯纳米催化剂（[电子邮件保护]）的合成，该催化剂在铃木交叉偶联和相关的均偶联反应中具有很高的活性。该系统中的活性催化成分是钯，只有在金纳米粒子存在下才能稳定。即使长时间存放在空气和湿气中也不会造成明显的活动损失。多功能性质[电子邮件保护]通过苯基硼酸的低浓度下的O-自偶联的选择性催化证明₂和苯基硼酸的下高澳氧化成苯酚₂浓度。[电子邮件保护]还证明了4-碘多烯的乌尔曼型同质偶联具有优异的收率。磁性回收的催化剂可以在铃木-宫浦交叉偶联中重复使用多达六次，具有始终如一的高活性，并且贵金属种类损失最少。通过这些反应，我们证明了金稳定的[受电子邮件保护]可以用作稳定且可回收的钯储库，用于多种钯催化的反应。