The dimerisation of monosubstituted α-hydroxyacetylenes by use of tris(triphenylphosphine)chlororhodium(<scp>I</scp>) as catalyst
作者:H. Singer、G. Wilkinson
DOI:10.1039/j19680000849
日期:——
It has been shown that catalytic amounts of tris(triphenylphosphine)chlororhodium(I), RhCl(PPh3)3, in benzene, dichloromethane, or chloroform solution will convert monosubstituted α-hydroxyacetylenes predominantly into the dimers. In this way 3-methylbut-1-yn-3-ol yields 2,7-dimethyloct-3-en-5-yne-2,7-diol; by analogy dimers were obtained from 3-methylpent-1-yn-3-ol, but-1-yn-3-ol, and 1-ethynylcyclohexan-1-ol
A copper (I or II)/diethylphosphite catalytic system for base-free additive dimerization of alkynes
作者:Inna G. Trostyanskaya、Irina P. Beletskaya
DOI:10.1016/j.tet.2016.11.073
日期:2017.1
Copper (I) or copper (II) salts and oxides promote regioselective head-to-head additive dimerization of aromatic and aliphatic terminal alkynes in the presence a catalytic amount of diethylphosphite. The reaction proceeds under ambient conditions without any added base with the formation of 1,4-disubstituted 1,3-enynes with the E isomer as major product in good to excellent yields. A plausible mechanism
Carboxylate Switch between Hydro- and Carbopalladation Pathways in Regiodivergent Dimerization of Alkynes
作者:Olga V. Zatolochnaya、Evgeniy G. Gordeev、Claire Jahier、Valentine P. Ananikov、Vladimir Gevorgyan
DOI:10.1002/chem.201402809
日期:2014.7.28
regiodivergent palladium‐catalyzed dimerization of terminalalkynes is presented. Employment of N‐heterocyclic carbene‐based palladium catalyst in the presence of phosphine ligand allows for highly regio‐ and stereoselective head‐to‐head dimerization reaction. Alternatively, addition of carboxylate anion to the reaction mixture triggers selective head‐to‐tail coupling. Computational studies suggest that reaction