提出了各种烯烃的选择性氢化和氘化的通用方案。这些反应成功的关键是使用特定的镍-石墨壳基核壳结构催化剂,该催化剂可以通过浸渍碳上的硝酸镍并随后在氩气下于 450 °C 下煅烧来方便地制备。应用这种纳米结构催化剂,具有工业和商业重要性的末端烯烃和内部烯烃在环境条件下(室温,使用1巴氢气或1巴氘)进行选择性氢化和氘化,从而获得相应的烷烃和氘。标记烷烃的收率良好至极好。通过克级反应以及高效的催化剂回收实验证明了这种镍基加氢方案的合成效用和实用性。
Novel zwitterionic phosphonium alkylsulfonate ligands are chemoselectively synthesized from N-heterocyclic phosphines and cyclic sulfones in one step in good to excellent yields.
Isolated-palladium complexes for catalyzed telomerization of butadiene with methanol in the presence of water
作者:Julien Mesnager、Emile Kuntz、Catherine Pinel
DOI:10.1016/j.jorganchem.2009.04.012
日期:2009.7
In order to study the performance of organometallic complexes in the telomerization of butadiene with methanol in aqueous medium, we synthesized and characterised hydrosoluble palladium complexes. [(π-allyl)Pd(TPPTS)2]+Cl− complex exhibited strong stability as no degradation was observed after storage at room temperature under air atmosphere for weeks. TON’s up to 36 000 were achieved at 50 °C.
By replacing one planar phenyl group of PPh3 with bulkier ferrocenyl or ruthenocenyl group, the performance of resulted metallocene-based phosphine ligand in the telomerization of 1,3-butadiene with methanol has been largely elevated compared to the widely used PPh3. High catalytic efficiency with good selectivity has been obtained under the conditions of high butadiene-to-palladium ratio, low catalyst
Nickel-Catalysed Hydroalkoxylation Reaction of 1,3-Butadiene: Ligand Controlled Selectivity for the Efficient and Atom-Economical Synthesis of Alkylbutenyl Ethers
作者:Sandra Bigot、Mohammed Samir Ibn El Alami、Alexis Mifleur、Yves Castanet、Isabelle Suisse、André Mortreux、Mathieu Sauthier
DOI:10.1002/chem.201300633
日期:2013.7.22
The nickel‐catalysed hydroalkoxylation of butadiene is promoted by a nickel(0)/dppb catalyst (dppb=1,4‐bis(diphenylphosphino)butane; see scheme). By following this new synthetic procedure, alkylbutenyl ethers are readily obtained from an alcohol and 1,3‐butadiene with exclusion of dimerisation and telomerisation products.
Telomerisation of Buta-1,3-diene and Methanol: Superiority of Chromanyl-Type Phosphines in the Dow Process for the Industrial Production of 1-MOD
作者:Mathieu J.-L. Tschan、Hélène Launay、Henk Hagen、Jordi Benet-Buchholz、Piet W. N. M. van Leeuwen
DOI:10.1002/chem.201100684
日期:2011.8.1
Butadiene and methanol were telomerised in the presence of palladium catalysts with ligands containing 8‐diphenylphosphinochromane‐like substituents at phosphorus. MonoXantphos and monoSPANphos afforded the most active, stable and selective catalysts known to date under commercially relevant production conditions for 1‐methoxyocta‐2,7‐diene, the precursor to oct‐1‐ene.