Solid-State Organic Reactions Proceeding by Pulverization of Inorganic Solid-Supports. Reactions of lodosobenzene with Unsaturated Hydrocarbons on Acid-Treated Silica Gel
Pulverization of solid mixtures of hydrogen halide-treated silica gels, iodosobenzene, and alkenes or an alkyne in the absence of a solvent brings about smooth and rapid reaction to give halogenated or oxidized products in good yields.
Iron-Catalyzed <i>Ortho</i> C–H Methylation of Aromatics Bearing a Simple Carbonyl Group with Methylaluminum and Tridentate Phosphine Ligand
作者:Rui Shang、Laurean Ilies、Eiichi Nakamura
DOI:10.1021/jacs.6b06908
日期:2016.8.17
(Me2N-TP), that allows us to convert an ortho C-H bond to a C-CH3 bond in aromatics and heteroaromatics bearing simple carbonyl groups under mild oxidative conditions. The reaction is powerful enough to methylate all four ortho C-H bonds in benzophenone. The reaction tolerates a variety of functionalgroups, such as boronic ester, halide, sulfide, heterocycles, and enolizable ketones.
Lewis acid-promoted electron transfer deoxygenation of epoxides, sulfoxides, and amine N-oxides: the role of low-valent niobium complexes from NbCl5 and Zn
作者:Kyungsoo Oh、William Eric Knabe
DOI:10.1016/j.tet.2009.02.013
日期:2009.4
A mild and operationally simple deoxygenation of epoxides, sulfoxides, and amine N-oxides is described using a sub-stoichiometric amount of low-valent niobium complexes generated in situ from commercially available NbCl5 and zinc dust. The deoxygenation proceeds by a reductive cleavage of polarized O–C/O–N/O–S bonds through a single electron transfer from zinc metal to the niobium–substrate complex
Piers’ borane-mediated hydrosilylation of epoxides and cyclic ethers
作者:Jianbo Zhang、Sehoon Park、Sukbok Chang
DOI:10.1039/c8cc03741h
日期:——
diarylborane-catalysed hydrosilylation of epoxides and cyclicethers. Mechanistic studies on the in situ generated Piers’ borane (C6F5)2BH with hydrosilanes in the presence of an epoxide revealed that an alkyloxy(diaryl)borane (C6F5)2BOR is readily formed as a catalytically competent species for the outer-sphere hydrosilylation of epoxides and cyclicethers.
我们报道了环氧化物和环醚的第一个二芳基硼烷催化的氢化硅烷化反应。在环氧化物存在下与氢硅烷原位生成Piers's硼烷(C 6 F 5)2 BH的机理研究表明,烷氧基(二芳基)硼烷(C 6 F 5)2 BOR易于形成为催化活性物质用于环氧化物和环醚的外球氢化硅烷化。
<i>o</i>-Benzenedisulfonimide as Reusable Brønsted Acid Catalyst for Acid-Catalyzed Organic Reactions
Acid-catalyzed organic reactions, such as etherification, esterification, acetal synthesis, cleavage, and interconversion, and pinacol rearrangement were carried out in the presence of catalytic amounts of o-benzenedisulfonimide as Bronsted acidcatalyst; the conditions were mild and selective. The catalyst was easily recovered and purified, ready to be used in further reactions, with economic and ecological