Rhodium(I) and iridium(I) complexes containing bidentate phosphine-imidazolyl donor ligands as catalysts for the hydroamination and hydrothiolation of alkynes
作者:Leslie D. Field、Barbara A. Messerle、Khuong Q. Vuong、Peter Turner
DOI:10.1039/b821188d
日期:——
of these complexes are effective as catalysts for the intramolecular hydroamination of 4-pentyn-1-amine to 2-methyl-1-pyrroline. The cationic complexes are significantly more effective than analogous neutral complexes. The cationic iridiumcomplex 8b , containing the phosphine-imidazolyl ligand with the bulky isopropyl groups on the phosphorus donor, is more efficient than analogous complexes with the
Rhodium(<scp>i</scp>) and iridium(<scp>i</scp>) complexes with bidentate N,N and P,N ligands as catalysts for the hydrothiolation of alkynes
作者:Suzanne Burling、Leslie D. Field、Barbara A. Messerle、Khuong Q. Vuong、Peter Turner
DOI:10.1039/b303774f
日期:——
analysis. The metal complexes (9)–(12) with the mixed P,N-donor ligand, PyP are in most cases more effective in promoting the hydrothiolation of alkynes in comparison with the analogous complexes (1)–(4) with N,N-donor ligands. The iridiumcomplexes were significantly more effective than their rhodium analogues in promoting the hydrothioloation of alkynes. The cationic complexes (9) and (10) are more effective
Stereospecific synthesis of alkenyl sulphides by cross-coupling reactions of secondary alkyl Grignard reagents with Z- or E-1-bromo-2-phenylthioethene in the presence of transition metal catalysts
Z- and E-1-bromo-2-phenylthioethenes were cross-coupled stereospecifically with s-alkyl Grignard reagents in the presence of a series of NiII, PdII or FeIII catalysts with the aim of finding a catalyst which would not cause s-alkyl → n-alkyl isomerization. With PdCl2(dppf) (dppf = 1,1′-bis(diphenylphosphino)ferrocene) and NiCl2(dppe) (dppe = 1,2-bis(diphenylphosphino)ethane) there was still some isomerization
Mild, Efficient and Highly Stereoselective Synthesis of (<i>Z</i>)-Vinyl Chalcogenides from Vinyl Bromides Catalyzed by Copper(I) in Ionic Liquids Based on Amino Acids
作者:Weiliang Bao、Zhiming Wang、Hanjie Mo
DOI:10.1055/s-2006-958413
日期:2007.1
A method for the synthesis of(Z)-vinyl chalcogenides by the coupling of vinyl bromides with thiols or diphenyl diselenide using copper(I) salts as catalysts in ionic liquids based on amino acids is reported. The desired vinyl chalcogenides were obtained in good to excellent yields with retention of stereochemistry. The ionic liquids play multiple roles in the reaction: they act as solvent, base, and