Novel zwitterionic phosphonium alkylsulfonate ligands are chemoselectively synthesized from N-heterocyclic phosphines and cyclic sulfones in one step in good to excellent yields.
Seven different crystalline bis(dienyl)magnesium·TMEDA complexes of open chain or cyclic structure were prepared by metal exchange reaction of corresponding potassium dienides. They are fluxional in solution due to the rapid 1,3-rearrangement. Terminally σ-bonded trans or (E) structure exists primarily in the open chain complexes while centrally σ-bonded cis structure in cyclic dienylmagnesium·TMEDA
Organic synthesis by means of noble metal complexes—XCIV
作者:J. Tsuji、M. Hara、K. Ohno
DOI:10.1016/s0040-4020(01)97350-8
日期:1974.1
Palladium compounds and metallic palladium combined with phosphine are active catalysts of selective hydrosilylation of terminal olefins. Butadiene and trichlorosilane give a 1:1 adduct and trimethylsilane affords a 1:2 adduct. Special features of the palladium catalyzed hydrosilylation reactions are presented.
The Multiple Roles of Imidazolium Ionic Liquids in Transition-Metal Catalysis: The Palladium-Catalyzed Telomerization of 1,3-Butadiene with Acetic Acid
作者:João M. Balbino、Daniel Peral、J. Carles Bayón、Jairton Dupont
DOI:10.1002/cctc.201402943
日期:2015.3
The telomerization of 1,3‐butadiene with acetic acid catalyzed by palladium(II) acetate associated with a series of phosphines in 3‐(2‐methoxyethyl)‐1‐methylimidazolium acetate was used to investigate the role of the ionic liquid. The ionic liquid plays multiple roles in this reaction as it acts as the solvent, stabilizer, ligand, and cocatalyst. The reaction performed in the presence of Dan2phos,
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