Ramberg Bäcklund type reactions of phosphonium salts
摘要:
Alkenes may be synthesised from (alpha-bromobenzyl)benzyldiphenylphosphonium salts by the action of amine bases. A series of stilbenes was synthesised by the action of N-bromosuccinimide and 2,2,6,6-tetramethylpiperidine directly upon dibenzyldiphenylphosphonium salts. The reaction, essentially a phosphonium analogue of the Ramberg Backlund displays a similar level of cis selectivity as that shown by the parent sulfone.
A layered double hydroxide-supported nanoplatinum catalyst is employed in the Heck and Stille cross-coupling of a wide range of iodoarenes to give the corresponding cross-coupled products in good to excellent yields. The catalyst is recovered by centrifugation and reused over a number of cycles with consistent activity.
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。
Cobalt(iii) complexes bearing bidentate, tridentate, and tetradentate N-heterocyclic carbenes: synthesis, X-ray structures and catalytic activities
作者:Zhenxing Xi、Bin Liu、Chunxin Lu、Wanzhi Chen
DOI:10.1039/b906242d
日期:——
[H(2)L3](PF(6))(2)via in situ generated silver carbene complexes under mild conditions. These cobalt complexes were characterized by (1)H and (13)C NMR spectroscopy and X-ray diffraction analysis. The cobalt complexes have been found to be good catalyst precursors for Kumada-Corriu cross-coupling reactions of aryl halides and Grignardreagents at room temperature. Complex 1 is more active under the mild
A Bifunctional Iron Nanocomposite Catalyst for Efficient Oxidation of Alkenes to Ketones and 1,2-Diketones
作者:Tao Song、Zhiming Ma、Peng Ren、Youzhu Yuan、Jianliang Xiao、Yong Yang
DOI:10.1021/acscatal.9b05197
日期:2020.4.17
sites of Fe–Nx and Fe phosphate, as oxidation and Lewis acid sites, were simultaneously integrated into a hierarchical N,P-dual doped porous carbon. As a bifunctional catalyst, it exhibited high efficiency for direct oxidativecleavage of alkenes into ketones or their oxidation into 1,2-diketones with a broad substrate scope and high functional group tolerance using TBHP as the oxidant in water under
bis-quinoline-2-carboxylic acid copper salt as a single crystal was prepared and characterized by X-ray single crystal analysis. The crystal as a catalyst was applied to the Mizoroki–Heck coupling reaction between arylboronic acids and α-olefins. A series of diarylethenes and aryl olefins were synthesized with good to excellent yields at room temperature. The catalytic system exhibited good functional group tolerance