Stereo- and Regioselective Addition of Arene to Alkyne Using Abnormal NHC Based Palladium Catalysts: Elucidating the Role of Trifluoroacetic Acid in Fujiwara Process
作者:Pradip Kumar Hota、Anex Jose、Swadhin K. Mandal
DOI:10.1021/acs.organomet.7b00649
日期:2017.11.27
(aNHC) based Pd catalysts have been used for the efficient hydroarylation of aromatic C–H bonds leading to new C–C bond formation through regio- and stereoselective addition to alkynes. The addition reaction has been realized by a catalytic amount of Pd (II) compound (0.5 mol %) in trifluoroacetic acid (TFA) under ambient conditions. Various arenes undergo transhydroarylation selectively across the triple
reaction protocol for the coupling of arenes with alkynes (the Fujiwara reaction), yielding products of formal trans-hydroarylation of the triple bond. The protocol makes use of a chelating N-heterocyclic dicarbene palladium(II) complex as catalyst and allows us to perform the reaction in a few hours with only 0.1 mol % catalyst yielding the trans-hydroarylation product in high yields and with excellent selectivity
Palladium incorporated MIL-101(Cr): a heterogeneous and reusable catalyst for the C–H functionalization of unactivated arenes
作者:Fillip Kumar Sarkar、Sushmita Gajurel、Lenida Kyndiah、Rajib Sarkar、Rupesh S. Devan、Amarta Kumar Pal
DOI:10.1039/d2nj03889g
日期:——
Herein, a palladium containing metal–organic framework was designed for use in the C–H functionalization of unactivated arenes. The catalyst was prepared via post-synthetic modification of amino-functionalized MIL-101(Cr) and was well characterized using spectroscopic techniques. The catalyst is highly active in the aforementioned reaction, resulting in a 70–92% yield of the desired products at room
Pd@GO catalyzed stereo- and regio-selective addition of arenes to alkynes and synthesis of coumarins <i>via</i> C–H functionalization
作者:Lenida Kyndiah、Fillip Kumar Sarkar、Sushmita Gajurel、Rajib Sarkar、Jasha Momo H. Anal、Amarta Kumar Pal
DOI:10.1039/d3ob01237a
日期:——
addition of arenes to alkynes via C–H bond functionalization has been developed using palladium nanoparticles supported on graphite oxide (Pd@GO) as the reusable catalyst. The prepared catalyst was characterized by various spectroscopic techniques such as FT-IR, TEM, SEM, EDX, P-XRD, and XPS analysis. The thermal stability of the catalyst was established by TGA. The C–H functionalized products were obtained