Pd together with CuI has been well known as the catalyst towards Sonogashirareaction, which provides an effective route to functional alkynes. However, the achievement of high activity and selectivity of this catalytic system is still challenging in some cases. Illustrative examples include their low activity for aryl chloride substrates, and switched selectivity to oxidative coupling products in
Pd 与 CuI 一起作为 Sonogashira 反应的催化剂是众所周知的,这为功能性炔烃提供了有效的途径。然而,在某些情况下,实现该催化体系的高活性和选择性仍然具有挑战性。说明性的例子包括它们对芳基氯底物的低活性,以及在空气气氛中对氧化偶联产物的选择性转换。在这项工作中,掺入了 Cu 的 Au 13纳米团簇 [Au 13 Cu 2 (PPh 3 ) 6 (SC 2 H 4 Ph) 6 ] + [NO 3 ] - (Au 13 Cu 2) 是通过快速合成以高产率设计和制备的。这种原子级精确的纳米团簇显示出成为 Sonogashira 反应的新型催化系统的潜力,具有高活性和选择性,以及即使在空气中也具有良好的可回收性。
<i>trans</i>-Hydroboration<i>vs.</i>1,2-reduction: divergent reactivity of ynones and ynoates in Lewis-base-catalyzed reactions with pinacolborane
In the presence of phosphine catalyst and pinacolborane, ynones undergo 1,2-reduction while ynoates undergotrans-hydroboration. Mechanistic insights into the two competing pathways lay grounds for control of selectivity in these processes.