bisacylphosphine oxide photoinitiator was used for the light mediated preparation of palladium nanoparticles (PdNPs) with a small diameter of 2.8 nm. All starting materials are commercially available, and PdNP synthesis is experimentally very easy to conduct. The PdNP-hybrid material was applied as catalyst for the semihydrogenation of various internal alkynes to provide the corresponding alkenes in excellent yields
facile light‐mediated preparation of small palladium nanoparticles (PdNPs) with a diameter of 1.3 nm and low dispersity by using low‐priced and readily prepared photoactive polymers is presented. These polymers act as reagents for the photochemical reduction of Pd ions and they are also stabilizers for the PdNPs generated in situ. The PdNP–polymer hybrid materials prepared by this reliable approach are
One-Pot Conversion of Aldehydes and Aryl Halides to Disubstituted Alkynes via Tandem Seyferth–Gilbert Homologation/Copper-Free Sonogashira Coupling
作者:Alexander Sapegin、Mikhail Krasavin
DOI:10.1021/acs.joc.9b01367
日期:2019.7.5
convenient protocol has been developed to convert a mixture of an aldehyde, aryl halide, and the Bestmann–Ohira reagent into disubstituted acetylene via a successive addition of base (Cs2CO3) and a Pd(II) catalyst, allowing sufficient time after addition of each of these reagents for the tandem processes (Seyferth–Gilbert homologation and Sonogashira coupling) to occur. Notably, for the latter reaction
通过连续添加碱(Cs 2 CO 3)和Pd(II)催化剂,已开发出一种实用方便的方案,可将醛,芳基卤化物和Bestmann-Ohira试剂的混合物转化为二取代乙炔。加入上述每种试剂后,就会发生串联过程(Seyferth-Gilbert同源和Sonogashira偶联)。值得注意的是,对于后一反应,不需要铜催化剂。
Synthesis of ferrocene[c]pyridin-2(1H)-one derivatives via Pd(II)-catalyzed C–H activation reaction under air
A Pd(II)-catalyzed C–H activation annulation under air has been successfully developed for efficient synthesis of ferrocene[c]pyridin-2(1H)-onederivatives with high yields and good regiochemistry. This method shows highly atom- and step-economical access to prepare ferrocene-fused heterocycles under mild conditions.
已成功开发了一种在空气中以Pd(II)催化的C–H活化环化技术,可高效合成高茂铁[ c ]吡啶2-2(1 H)-one衍生物,并具有良好的区域化学性质。该方法显示了在温和条件下制备二茂铁稠合杂环的高度原子和步骤经济的途径。