Arylsilylation of aryl halides using the magnetically recyclable bimetallic Pd–Pt–Fe<sub>3</sub>O<sub>4</sub> catalyst
作者:Jisun Jang、Sangmoon Byun、B. Moon Kim、Sunwoo Lee
DOI:10.1039/c7cc09926f
日期:——
metal-catalyzed silylations have typically involved the use of homogeneous non-recyclable catalytic systems. In this work, the first example of a recyclable catalytic system for the synthesis of arylsilanes has been reported, which utilizes the bimetallic complex, Pd–Pt–Fe3O4 nanoparticles. Various arylsilanes were prepared by the reaction of aryl iodides (or bromides) with hydrosilanes. This methodology
过渡金属催化的甲硅烷基化通常涉及均相不可回收的催化体系的使用。在这项工作中,已经报道了合成芳基硅烷的可回收催化体系的第一个实例,该体系利用了双金属配合物Pd–Pt–Fe 3 O 4纳米颗粒。通过使芳基碘化物(或溴化物)与氢化硅烷反应来制备各种芳基硅烷。该方法显示出对酯,酮,醛,硝基和氰基的良好官能团耐受性。双金属Pd–Pt–Fe 3 O 4催化体系的活性优于单金属Pt–Fe 3 O 4和Pd–Fe 3 O 4。催化剂。此外,双金属Pd–Pt–Fe 3 O 4催化体系可以轻松回收并重复使用超过20个循环。
Intermolecular C–H Silylation of Arenes and Heteroarenes with HSiEt<sub>3</sub>under Operationally Diverse Conditions: Neat/Stoichiometric and Acceptor/Acceptorless
作者:Kang-sang Lee、Dimitris Katsoulis、Jongwook Choi
DOI:10.1021/acscatal.5b02806
日期:2016.3.4
Efficient protocols for Rh-catalyzed intermolecular C-H silylation of unactivated arenes and heteroarenes are disclosed. The silylations are catalyzed by a Rh-complex (2 mol %) derived in situ from commercially available Rh(nbd)(2)BF4 and (S,S)-i-Pr-BPE (L3) with Et3SiH in the presence of hydrogen acceptor under either neat (excess of arene) or stoichiometric conditions. The regioselectivity is determined mainly by the steric bulk of the substituents and by the electronic effect as an ancillary factor. In addition, our preliminary result shows that the current protocol catalyzes the silylation of arenes in the absence of hydrogen acceptors.
Efficient Iridium‐Catalyzed CH Functionalization/Silylation of Heteroarenes
作者:Biao Lu、John R. Falck
DOI:10.1002/anie.200802456
日期:2008.9.15
A well-defined NHC–Ir(<scp>iii</scp>) catalyst for the silylation of aromatic C–H bonds: substrate survey and mechanistic insights
作者:Laura Rubio-Pérez、Manuel Iglesias、Julen Munárriz、Victor Polo、Vincenzo Passarelli、Jesús J. Pérez-Torrente、Luis A. Oro
DOI:10.1039/c6sc04899d
日期:——
NHC–Ir(III) catalyst, [Ir(H)2(IPr)(py)3][BF4] (IPr = 1,3-bis-(2,6-diisopropylphenyl)imidazol-2-ylidene), that provides access to a wide range of aryl- and heteroaryl-silanes by intermolecular dehydrogenative C–H bond silylation has been prepared and fully characterized. The directed and non-directed functionalisation of C–H bonds has been accomplished successfully using an arene as the limiting reagent