AIBN-Catalyzed Oxidative Cleavage of gem-Disubstituted Alkenes with O2 as an Oxidant
摘要:
A 2,2-azobis(isobutyronitrile) (AIBN) catalyzed oxidative cleavage of gem-disubstituted alkenes with molecular oxygen as the oxidant has been described. Carbonyl compounds were obtained as the desired products in high yield under mild conditions. Based on previous documents and current experimental results, a relatively reasonable mechanism is proposed.
Synthesis and Isolation of an Acyclic Tridentate Bis(pyridine)carbodicarbene and Studies on Its Structural Implications and Reactivities
作者:Yu-Chen Hsu、Jiun-Shian Shen、Bo-Chao Lin、Wen-Ching Chen、Yi-Tsu Chan、Wei-Min Ching、Glenn P. A. Yap、Chao-Ping Hsu、Tiow-Gan Ong
DOI:10.1002/anie.201406481
日期:2015.2.16
The simple synthetic development of acyclic pincer bis(pyridine)carbodicarbene is depicted herein. Presented is the first isolated structural pincer carbodicarbene with a C‐C‐C angle of 143°, larger than the monodentate framework. More importantly, theoretical analysis showed that this carbodicarbene embodies a more allene‐like character. Palladium complexes supported by this pincer ligand are active
Highly Active Catalyst for the Heterogeneous Suzuki−Miyaura Reaction: Assembled Complex of Palladium and Non-Cross-Linked Amphiphilic Polymer
作者:Yoichi M. A. Yamada、Koji Takeda、Hideyo Takahashi、Shiro Ikegami
DOI:10.1021/jo034354v
日期:2003.10.1
An assembled insoluble catalyst, PdAS, prepared from palladium ((NH4)2PdCl4 (1)) and non-cross-linked amphiphilic copolymer poly(N-isopropylacrylamide-co-4-diphenylstyrylphosphine) (2) was developed. It was found that PdAS is an excellent catalyst for the Suzuki-Miyaura reaction on three points: (1) The use of 8 x 10(-7) to 5 x 10(-4) mol equiv of PdAS afforded the coupling products efficiently after
开发了由钯((NH4)2PdCl4(1))和非交联两亲共聚物聚(N-异丙基丙烯酰胺-co-4-二苯基苯乙烯基膦)(2)制备的组装的不溶催化剂PdAS。已发现,PdAS在以下三个方面是铃木-宫浦反应的优良催化剂:(1)使用8 x 10(-7)到5 x 10(-4)摩尔当量的PdAS在偶联后有效地提供了偶联产物简单的后处理,营业额高达1,250,000。(2)催化剂可重复使用多次而不会损失催化活性。(3)PdAS在任何反应介质(即水或水性或无水有机溶剂)中均显示出良好的稳定性。对PdAS的分析研究表明2中的膦与钯配位形成PdCl2(PPh2Ar)2物种。
Palladium supported on poly(N-vinylimidazole) or poly(N-vinylimidazole-co-N-vinylcaprolactam) as a new recyclable catalyst for the Mizoroki–Heck reaction
作者:Irina P. Beletskaya、Alexey R. Khokhlov、Elena A. Tarasenko、Vladimir S. Tyurin
DOI:10.1016/j.jorganchem.2007.06.056
日期:2007.9
A new catalytic system based on the palladium supported on poly(N-vinylimidazole) or poly(N-vinylimidazole-co-N-vinylcaprolactam) was investigated. High efficiency of the catalyst along with its recycling ability was demonstrated in the Mizoroki–Heckreaction.
limitations of the base-free oxidativeHeckreaction with arylboronicacids have been explored. Under our conditions, the dmphen−palladium(II)-catalyzed arylation proceeded with air or p-benzoquinone as reoxidants of palladium(0). We found that ambient temperature and mild aerobic conditions allow for the use of substrates sensitive to palladium(II)-catalyzedoxidation. OxidativeHeck couplings, employing