Chiral and achiral phosphine derivatives of alkylidyne tricobalt carbonyl clusters as catalyst precursors for (asymmetric) inter- and intramolecular Pauson–Khand reactions
作者:Viktor Moberg、M. Abdul Mottalib、Désirée Sauer、Yulia Poplavskaya、Donald C. Craig、Stephen B. Colbran、Antony J. Deeming、Ebbe Nordlander
DOI:10.1039/b717698h
日期:——
Phosphine derivatives of alkylidyne tricobalt carbonyl clusters have been tested as catalysts/catalyst precursors in intermolecular and (asymmetric) intramolecular Pauson-Khand reactions. A number of new phosphine derivatives of the tricobalt alkylidyne clusters [Co3(micro3-CR)(CO)9] (R = H, CO2Et) were prepared and characterised. The clusters [Co3(micro3-CR)(CO)9-x(PR'3)x] (PR'3 = achiral or chiral
Tetramethyl Thiourea/Co<sub>2</sub>(CO)<sub>8</sub>-Catalyzed Pauson−Khand Reaction under Balloon Pressure of CO
作者:Yefeng Tang、Lujiang Deng、Yandong Zhang、Guangbin Dong、Jiahua Chen、Zhen Yang
DOI:10.1021/ol047651a
日期:2005.2.1
A Pauson-Khandtype of conversion of enynes to bicycliccyclopentenones employing the commercially available Co2(CO)8 and tetramethylthiourea (TMTU) as catalysts is described. This method allows a variety of enynes with diverse functional groups to be cyclized into cyclopentenones of interest. [reaction: see text]
treatment of cobalt oxide supported gold nanoparticles (Au/Co3O4) under syngas atmosphere effectively generated a cobalt carbonyl-like active species in the reaction vessel. The preparation of Au/Co3O4 was quite simple and the in situ generated cobalt species could be used as a stable and easy handling alternative for dicobaltoctacarbonyl without bothersome purification prior to use. The reactions, which
在合成气气氛下处理氧化钴负载的金纳米颗粒(Au / Co 3 O 4)可在反应容器中有效生成羰基钴样活性物质。Au / Co 3 O 4的制备非常简单,原位生成的钴物种可以用作八羰基二钴的稳定且易于处理的替代品,而无需在使用前进行麻烦的纯化。该反应对二钴八羰基化合物的纯度敏感,例如环氧化物的烷氧羰基化反应和Pauson-Khand反应,随着Au / Co 3 O 4顺利进行。
Pauson–Khand reactions catalyzed by entrapped rhodium complexes
作者:Kang Hyun Park、Seung Uk Son、Young Keun Chung
DOI:10.1016/s0040-4039(03)00434-9
日期:2003.3
An entrapped Rh complex prepared by a sol–gel process has been used as a catalyst in the Pauson–Khandreaction under mild reaction conditions; the catalyst is easily recovered and reused at least 10 times without losing catalyst activity.
作者:Yuefan Wang、Lingmin Xu、Ruocheng Yu、Jiahua Chen、Zhen Yang
DOI:10.1039/c2cc17971g
日期:——
A cobaltâTMTU complex, derived from the in situ reduction of CoBr2 with Zn in the presence of TMTU, can catalyze PausonâKhand reaction at a balloon pressure of CO, which enables the synthesis of structurally diverse cyclopentenones. This catalytic system works efficiently for both intermolecular and intramolecular PK reactions.