strategy to turnover H‐MII‐X complexes has enabled both intra‐ and intermolecular Mizoroki–Heck (MH)‐type reactions of arylcyanides that are challenging to realize under traditional, basic conditions. Initially, a cascade carbonickelation/MH reaction of 2‐cyanostyrenes was achieved using a key alkyne transfer hydrocyanation step. Mechanistic experiments supported the proposed catalytic cycle, including
一种新的转移H-M II - X配合物的转移加氢官能化策略,使芳基氰化物的分子内和分子间Mizoroki-Heck(MH)型反应成为可能,这在传统的基本条件下很难实现。最初,使用关键的炔烃转移氢氰化步骤实现了2-氰基苯乙烯的级联羰基化/ MH反应。机械实验支持了拟议的催化循环,包括促成转移的转移氢氰化步骤。然后将反应性扩展至苄腈和苯乙烯的分子间MH反应。
Synthesis of Stilbenes by Rhodium-Catalyzed Aerobic Alkenylation of Arenes via C–H Activation
作者:Xiaofan Jia、Lucas I. Frye、Weihao Zhu、Shunyan Gu、T. Brent Gunnoe
DOI:10.1021/jacs.0c03935
日期:2020.6.10
Arenealkenylation is commonly achieved by late transition metal-mediated C(sp2)-C(sp2) cross-coupling, but this strategy typically requires prefunctionalized substrates (e.g., with halides or pseudohalides) and/or the presence of a directing group on the arene. Transition metal-mediated areneC-Hactivation and alkenylation offers an alternative method to functionalize arene substrates. Herein, we
Efficient Ni-catalyzed conversion of phenols protected with 2,4,6-trichloro-1,3,5-triazine (TCT) to olefins
作者:E. Etemadi-Davan、N. Iranpoor
DOI:10.1039/c7cc06717h
日期:——
One-pot conversion of phenols to the targeted olefins via C–O activation using 2,4,6-trichloro-1,3,5-triazine.
一锅法将酚直接转化为目标烯烃,通过使用2,4,6-三氯-1,3,5-三嗪进行C-O活化。
Alkene formation through condensation of phenylmethanesulphonyl fluoride with carbonyl compounds
作者:Shinzo Kagabu、Kenji Hara、Junko Takahashi
DOI:10.1039/c39910000408
日期:——
Arylmethanesulphonyl fluorides condense with aromatic, aliphatic and conjugated aldehydes and ketones in the presence of potassium carbonate and a crown ether to give aryl-substituted alkenes in satisfactory to modest yields.
Ultra‐small and highly dispersed Pd nanoparticles inside the pores of ZIF‐8: Sustainable approach to waste‐minimized Mizoroki–Heck cross‐coupling reaction based on reusable heterogeneous catalyst
material, namely Pd nanoparticles@N‐heterocyclic carbene@ZIF‐8, with a high internal surface area was successfully prepared using a dispersed anionic sulfonated N‐heterocyclic carbene–Pd(II) precursor inside the cavities of zeolitic imidazolate framework (ZIF‐8) using an impregnation approach followed by reduction with NaBH4. The anionic sulfonated N‐heterocycliccarbene was found to be a superb ligand