A novel catlytic synthesis of vinyl carboamtes from carbon dioxide, diethylamine, and alkynes in the presence of Ru3(CO)12
作者:Yoshiyuki Sasaki、Pierre H. Dixneuf
DOI:10.1039/c39860000790
日期:——
The reaction of carbondioxide, diethylamine, and hex-1-yne(1a) or phenylacetylene (1b), catalysed by Ru3(CO)12, gave the vinyl carbamates (2a), (3a) and (4a) or (2b) and (3b).
Regio- and Stereoselective Dimerization of Terminal Alkynes to Enynes in InCl<sub>3</sub>-NaBH<sub>4</sub>-MeCN System
作者:De-Yu Yang、Chun-Yan Wang、Hua Su
DOI:10.1055/s-2004-815428
日期:——
A novel method to prepare (E)-enynes is described in this paper. The InCl3-NaBH4-MeCN system showed high regio- and stereoselectivity for the dimerization of terminal alkynes to enynes.
Palladium-catalyzed hydrogenolysis of 2-alkynyl formates and elimination of 2-alkynyl carbonates. 2-Alkynylpalladium complex vs. allenylpalladium complex as intermediates
Examples of palladium-catalyzed reactions of 2-alkynyl esters via the 2-alkynylpalladium intermediates are presented. The palladium-catalyzedhydrogenolysis of 2-alkynyl formates, which have internal triple bonds, affords alkynes via the 2-alkynylpalladium as an intermediate. The elimination reaction of 2-alkynyl carbonates yields conjugated enynes via the 2-alkynylpalladium intermediates.
On the use of solid-state <sup>45</sup>Sc NMR for structural investigations of molecular and silica-supported scandium amide catalysts
作者:T. Vancompernolle、X. Trivelli、L. Delevoye、F. Pourpoint、R. M. Gauvin
DOI:10.1039/c7dt02415k
日期:——
Tris- and tetra-coordinated scandium amides were grafted onto silica and probed as catalysts for alkyne dimerization. 45Sc NMR was carried out, providing information about the metal coordination sphere. The increasing number of coordinated ligands was correlated with decreased catalytic activity.
One-step synthesis of vinyl carbamates catalyzed by mononuclear ruthenium complexes via addition of carbon dioxide and amine to terminal alkynes
作者:R. Mahé、P.H. Dixneuf、S. Lécolier
DOI:10.1016/s0040-4039(00)87801-6
日期:1986.1
Terminal alkynes with secondary amines (dimethylamine, diethylamine, piperidine, morpholine) and CO2 in the presence of mononuclear ruthenium catalysts, afford the vinylcarbamates R1CHCHOCONR2. The reaction studies suggest, as the active catalytic species, a ruthenium-vinylidene intermediate.