Acetic Acid-Promoted Rhodium(III)-Catalyzed Hydroarylation of Terminal Alkynes
作者:Chang-Lin Duan、Xing-Yu Liu、Yun-Xuan Tan、Rui Ding、Shiping Yang、Ping Tian、Guo-Qiang Lin
DOI:10.1055/s-0037-1611780
日期:2019.5
Rhodium(III)-catalyzed hydroarylation of terminal alkynes has not previously been achieved because of the inevitable oligomerization and other side reactions. Here, we report a novel Cp*Rh(III)-catalyzed hydroarylation of terminal alkynes in acetic acid as solvent to facilitate the C–H bond activation and subsequent transformations. This reaction proceeds under mild conditions, providing an effective
Delineating the critical role of acid additives in Mn-catalysed C–H bond functionalisation processes
作者:L. Anders Hammarback、Alan Robinson、Jason M. Lynam、Ian J. S. Fairlamb
DOI:10.1039/c9cc00257j
日期:——
Addition of co-catalytic Cy2NH to Mn-catalysed C–H bond activation reactions suggests that the conjugate acid, Cy2NH2X, influences catalysis. Here, acids are shown to positively influence C–H bond alkenylation catalysis involving alkynes. For certain types of alkynes an acid additive is critical to catalysis. In stark contrast, acids retard catalysis involving acrylates. [Cy2NH2]X salts also play a key