carbonylation reaction for the synthesis of fluoren‐9‐ones from 2‐halogenated biphenyls using phenyl formate as a carbon monoxide surrogate was achieved. The combined use of cesium carbonate and o‐anisic acid resulted in a remarkable rate enhancement, where the reaction was complete within 3 min in some cases. Mechanistic studies indicated that the turnover‐limiting step of the reaction was the C−H bond‐cleaving
A highly efficient palladium‐catalyzed disilylation reaction of arylhalides through C−H activation has been developed for the first time. The reaction has broad substrate scope. A variety of arylhalides can be disilylated by three types of C−H activation, including C(sp2)−H, C(sp3)−H, and remote C−H activation. In particular, the reactions are also unusually efficient. The yields are essentially
The synthesis of some substituted biphenyl-4-carboxylic acids, 4-biphenylylacetic acids, and 4-aminobiphenyls
作者:D. J. Byron、G. W. Gray、R. C. Wilson
DOI:10.1039/j39660000840
日期:——
The synthesis of a range of substitutedbiphenyl-4-carboxylicacids and 4-aminobiphenyls is described. Preparations are included for the parent biphenyl-4-carboxylicacid, and for 4-biphenylylaceticacid and three substituted4-biphenylylaceticacids.
Scalable electrochemical synthesis of diaryliodonium salts
作者:Mohamed Elsherbini、Wesley J. Moran
DOI:10.1039/d1ob00457c
日期:——
Cyclic and acyclic diaryliodonium are synthesised by anodic oxidation of iodobiaryls and iodoarene/arene mixtures, respectively, in a simple undivided electrolysis cell in MeCN–HFIP–TfOH without any added electrolyte salts. This atom efficient process does not require chemical oxidants and generates no chemical waste. More than 30 cyclic and acyclic diaryliodoniumsalts with different substitution
环状和非环状二芳基碘鎓分别通过碘联芳基和碘代芳烃/芳烃混合物的阳极氧化合成,在 MeCN-HFIP-TfOH 的简单未分隔电解池中,不添加任何电解质盐。这种原子效率的过程不需要化学氧化剂,也不会产生化学废物。以非常好的收率制备了 30 多种具有不同取代模式的环状和非环状二芳基碘鎓盐。将反应放大至 10 mmol 规模,在不到 3 小时内得到超过 4 克的二苯并[ b , d ]碘-5-鎓三氟甲磺酸盐 (>95%)。大规模实验的溶剂混合物被回收(>97%)并循环多次,收率没有显着降低。
Synthesis of Triphenylenes Starting from 2-Iodobiphenyls and Iodobenzenes via Palladium-Catalyzed Dual C–H Activation and Double C–C Bond Formation
A novel and facile approach for the synthesis of triphenylenes has been developed via palladium-catalyzed coupling of 2-iodobiphenyls and iodobenzenes. The reaction involves dual palladium-catalyzed C–H activations and double palladium-catalyzed C–C bond formations. A range of unsymmetrically functionalized triphenylenes can be synthesized with the reaction. The approach features readily available