Allylbenzene derivatives are ubiquitous frameworks in organic chemistry. Herein is described an efficient copper-catalyzed cross-coupling reaction using vinylsilanes and benzyl bromides, leading to the synthesis of allylbenzenes. This methodology allows the use of cis, trans and 1,1'-disubstituted vinylsilanes as well as a large number of sensitive moieties.
compounds. Hereby, we describe a new copper-catalyzedvinylsilane transformation. Various vinylsilanes were allylated by using a copper(I) salt, and this led to the formation of polysubstituted 1,4-dienes bearing sensitive moieties such as halogens, ketones, and aldehydes. Hereby is described a new copper-catalyzedvinylsilane transformation. Various vinylsilanes were allylated by using copper(I) salts
Synthetic and structural studies of NHC–Pt(dvtms) complexes and their application as alkene hydrosilylation catalysts (NHC=N-heterocyclic carbene, dvtms=divinyltetramethylsiloxane)
The synthesis and structuralcharacterization of a series of platinum complexes, bearing N-heterocyclic carbenes (NHC) and divinyltetramethylsiloxane (dvtms) as supporting ligands, are described. The reaction of commercially available Karstedt’s catalyst (Pt2(η2-ViSiMe2)2O}3) with in situ generated NHC leads to monomeric platinum(0) complexes in which one NHC is bound to the metal center, as indicated
A general protocol for the synthesis of Pt-NHC (NHC = N-heterocyclic carbene) hydrosilylation catalysts
作者:Benon P. Maliszewski、Nikolaos V. Tzouras、Sébastien G. Guillet、Marina Saab、Marek Beliš、Kristof Van Hecke、Fady Nahra、Steven P. Nolan
DOI:10.1039/d0dt03480k
日期:——
A general, user-friendly synthetic route to [Pt(NHC)(L)Cl2] and [Pt(NHC)(dvtms)] (L = DMS, Py; DMS = dimethyl sulfide, dvtms = divinyltetramethylsiloxane, Py = pyridine) complexes has been developed. The procedure is applicable to a wide range of ligands and enables facile synthetic access to key Pt(0)- and Pt(II)-NHC complexes used in hydrosilylation catalysis.
Expedient, Direct Synthesis of (L)Pt(0)(1,6-diene) Complexes from H<sub>2</sub>PtCl<sub>6</sub>
作者:Guillaume Berthon-Gelloz、Jean-Marc Schumers、Fabio Lucaccioni、Bernard Tinant、Johan Wouters、István E. Markó
DOI:10.1021/om7007088
日期:2007.11.1
The one-pot synthesis of useful [Pt-2(0)(eta(4) -1,6-diene)3] complexes, directly from H2PtCl6 center dot xH(2)O, has remained an unaddressed problem. We have found that the treatment of an i-PrOH solution of H2PtCl6 center dot xH(2)O by (Me3SiO)(2)MeSi(CH=CH2), in the presence of allyl ether (AE), followed by reaction of the in situ generated Pt(0) species with IPr carbene (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) enables the isolation of (IPr)Pt(AE) (1) in 50-70% yield. The scope of this method has been extended to other (L)Pi(1,6-diene) complexes (L = 1,3-dicyclohexylimidazol-2-ylidene, triphenylphoshine; 1,6-diene = diethyl 2,2-diallylmalonate (DAM)), and the molecular structure of the (IPr)Pt(DAM) (4) complex has been unequivocally determined by a single-crystal X-ray diffraction analysis. These results are significant for the formation of active L-Pt(0) fragments in catalysis.