通过AIBN / O 2催化剂体系实现了sp 3 C H键的官能化和C C键的裂解,在温和的反应条件下提供了一系列的二苯甲酮。机理研究表明,过氧化物中间体参与了这一转变,在二苯基甲烷的情况下,sp 3 C C键通过过氧化物重排而断裂,这可能提供了一种断裂相对较强的C C键并被应用的新方法。更一般的C C键活化。
[EN] IRON BISPHENOLATE COMPLEXES AND METHODS OF USE AND SYNTHESIS THEREOF<br/>[FR] COMPLEXES BISPHÉNOLATES DE FER ET LEURS PROCÉDÉS D'UTILISATION ET DE SYNTHÈSE
申请人:UNIV PRINCE EDWARD ISLAND
公开号:WO2013053046A1
公开(公告)日:2013-04-18
The present application, relates to iron bisphenolate complexes and methods of use and synthesis thereof. The iron complexes are prepared from tridentate or tetradentate ligands of Formula I: wherein R1 and R2 are as defined herein. Also provided are methods and processes of using the iron bisphenolate complexes as catalysts in cross-coupling reactions and in controlled radical polymerizations.
Coupling of arylboronic acids with benzyl halides or mesylates without adding transition metal catalysts
作者:Guojiao Wu、Shuai Xu、Yifan Deng、Chaoqiang Wu、Xia Zhao、Wenzhi Ji、Yan Zhang、Jianbo Wang
DOI:10.1016/j.tet.2016.10.031
日期:2016.12
We report herein a transition-metal-free coupling reaction of arylboronic acids with benzyl halides and mesylates for the construction of C(sp2)C(sp3) bonds. A unique feature of this coupling reaction is the formation regioisomers in some cases. Mechanistic studies suggest that this reaction may proceed via an unprecedented Friedel–Crafts-type reactionpathway under base conditions with the assistance
Palladium-Catalyzed Cross-Methylation of Aryl Chlorides by Stabilized Dimethylaluminium and -Gallium Reagents
作者:Jochanan Blum、Olga Berlin、David Milstein、Yehoshua Ben-David、Birgit C. Wassermann、Stefan Schutte、Herbert Schumann
DOI:10.1055/s-2000-6373
日期:——
Two methods for palladium-catalyzed cross-methylation of aryl chlorides by intramolecularly stabilized dialkylaluminium and -gallium complexes 6-13 have been studied. In one method, in which either tetrakis(triphenylphosphine)palladium (1) or dichlorobis(triphenylphosphine)palladium (2) is used as the catalyst at 80-90 °C, the activation of the chlorine atom is affected by introduction of strong electron-withdrawing groups into the aromatic moiety. The second method is based on the application of either [1,3-bis(diisopropylphosphino)propane)]palladium (4) or homologous electron-rich palladium complexes as catalysts. Although 4 promotes smooth cross-alkylation of aryl chlorides it fails to activate simple aryl bromides.
Cooperative Al–H Bond Activation in DIBAL-H: Catalytic Generation of an Alumenium-Ion-Like Lewis Acid for Hydrodefluorinative Friedel–Crafts Alkylation
作者:Francis Forster、Toni T. Metsänen、Elisabeth Irran、Peter Hrobárik、Martin Oestreich
DOI:10.1021/jacs.7b09444
日期:2017.11.15
donor-acceptor σ(Ru-H) → Al interaction. Despite the extra stabilization of the aluminum center by the interaction with both the sulfur atom and the Ru-H bond, the hydroalane adducts are found to be stronger Lewisacids and electrophiles than the free ruthenium catalyst and DIBAL-H in its different aggregation states. Hence, the DIBAL-H molecule and its Al-H bond are activated by the Ru-S bond, but these
of benzyl bromide, potassium cyanide, and alumina in an aromatic solvent yields benzyl cyanide, whereas mechanical agitation gives the Friedel–Crafts type product; sonication changes the main reactionpathway from aromatic electrophilic to aliphatic nucleophilic substitution.