Palladium Nanoparticles on Graphite Oxide as Catalyst for SuzukiMiyaura, MizorokiHeck, and Sonogashira Reactions
作者:Luigi Rumi、Gil M. Scheuermann、Rolf Mülhaupt、Willi Bannwarth
DOI:10.1002/hlca.201000412
日期:2011.6
system was applied successfully to SuzukiMiyaura couplings of some arylchlorides and to the MizorokiHeck as well as the Sonogashira reaction showing relatively high activities and good selectivities. Like with other ligand‐free supported systems, the reaction proceeded dominantly by a homogeneousmechanism, but attack of an aryl iodide to Pd‐nanoparticles can be excluded as substantial contribution
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
N-Phenylurea was found to constitute a highly efficient, yet low-priced, phosphine-free ligand for the Pd-catalyzedHeck and room-temperature Suzukireactions of aryl bromides and iodides with very high turnover numbers (ca. 103–104).
Process for preparing aromatic olefins using palladacycle catalysis
申请人:Hoechst AG
公开号:US05698755A1
公开(公告)日:1997-12-16
The invention relates to a process for preparing monofunctional, bifunctional or polyfunctional aromatic olefins of the formula (I) ##STR1## by reaction of haloaromatics of the formula (II) ##STR2## with olefins of the formula (III) ##STR3## , wherein a palladium compound of the formula (IV) ##STR4## is used as the catalyst.
A Palladium NNC-Pincer Complex as an Efficient Catalyst Precursor for the Mizoroki−Heck Reaction
作者:Go Hamasaka、Shun Ichii、Yasuhiro Uozumi
DOI:10.1002/adsc.201800099
日期:2018.5.2
The Mizoroki−Heckreaction of aryl halides (iodides, bromides, or chlorides) with activated alkenes in the presence of a palladium NNC‐pincer complex at ppb to ppm loadings gave the corresponding internal alkenes in excellent yields. The total turnover number and turnover frequency reached up to 8.70×108 and 1.21×107 h−1 (3.36×103 s−1), respectively. The catalyst was applied in a ten‐gram‐scale synthesis
芳族卤化物(碘化物,溴化物或氯化物)与活性烯烃在钯NNC-钳夹配合物(ppb)至ppm负载量下的Mizoroki-Heck反应得到了相应的内部烯烃,收率很好。总周转次数和周转频率分别达到8.70×10 8和1.21×10 7 h -1(3.36×10 3 s -1)。该催化剂用于UV-B防晒剂辛诺酸酯(2-乙基己基4-甲氧基肉桂酸酯)的10克级合成。反应速率分析,反应混合物的透射电子显微镜检查和中毒试验表明,单体钯物质是催化循环中的催化活性物质。