48 h at 140 °C) in the absence of any co‐catalyst radical initiator. To the best of our knowledge, our turnovers (ca. 5670) are much higher than that reported hitherto. Quantum mechanical calculations demonstrate that the path involving the activation of carbontetrachloride by (Cy2NNN)RuCl2 is more favoured than the path where carbontetrachloride is activated by (Cy2NNN)RuCl2(η2‐styrene). Density
Visible light-mediated polychlorination of alkenes <i>via</i> the dichloromethyl radical generated by chloroform and chlorides
作者:Chunying Wu、Xin Hui、Dan Zhang、Minghui Zhang、Yunbo Zhu、Sicen Wang
DOI:10.1039/d1gc04109f
日期:——
We report a novel visiblelight-mediated protocol for polychlorination of alkenes by employing commercially available bulk chemicals, chloroform and chlorides. This methodology enables the installation of multiple chlorine atoms into alkene feedstocks in a single step and provides the corresponding chloroalkanes in high yields under mild reaction conditions. Additionally, this transformation tolerates
Highly Efficient Heterogeneous Aqueous Kharasch Reaction with an Amphiphilic Resin-Supported Ruthenium Catalyst
作者:Yohei Oe、Yasuhiro Uozumi
DOI:10.1002/adsc.200800359
日期:2008.8.4
An amphiphilic polystyrene-polyethylene glycol (PS-PEG) resin-supportedruthenium complex was designed and prepared. The polymeric Ru complex was found to promote the transition metal-catalyzed atom transfer radical addition of halogenated compounds to olefins, the Kharaschreaction, in water under heterogeneous as well as AIBN-free conditions with a high level of atom economy to meet green chemical
cycle: the radical addition reaction rate obeyed first-order kinetics that were dependent on the concentrations of the catalyst, styrene, and CCl4, while a saturation effect was observed at a high CCl4 concentration. In the presence of excess amounts of styrene, styrene coordinated in an η2-olefinic manner to the niobium center to decrease the reaction rate. No observation of oligomers or polymers of styrene
New pincer-type diphosphinito (POCOP) complexes of Ni<sup>II</sup>and Ni<sup>III</sup>
作者:Valerica Pandarus、Davit Zargarian
DOI:10.1039/b613812h
日期:——
This communication reports the synthesis and characterization of the new, pincer-type, square-planar, 16-electron compounds 2,6-(OPPri2)2C6H3}NiIIBr, 1, and (Pri2POCH2)2CH}NiIIBr, 2, and the square-pyramidal, 17-electron complex (Pri2POCH2)2CH}NiIIIBr2, 3.