Ru-mediated selective addition reactions of carboxylic acids to internal and terminal alkynes
作者:Solmaz Karabulut、Bengi Özgün Öztürk、Yavuz İmamoğlu
DOI:10.1016/j.jorganchem.2010.05.018
日期:2010.9
towards carboxylic acid addition to the triple bond of terminalalkynes, rather than triple bond addition to the double bond of the enoic acids. To evaluate the results obtained from the carboxylic acid addition reaction of terminalalkynes, the homodimerisation of terminalalkynes (phenylacetylene, 1-octyne, 1-heptyne) was also studied. The homodimerisation of terminalalkynes is found to proceed
Activation of carbon dioxide: nickel-catalyzed electrochemical carboxylation of diynes
作者:Sylvie Derien、Jean Claude Clinet、Elisabet Dunach、Jacques Perichon
DOI:10.1021/jo00061a038
日期:1993.4
The simultaneous activation of carbon dioxide and diynes by electrogenerated LNi(0) complexes (L = bpy, pentamethyldiethylenetriamine: PMDTA) enables the selective incorporation of one molecule of CO2 into the unsaturated systems and the preparative-scale electrosyntheses of carboxylic acids. A series of nonconjugated diynes afforded selectively linear or cyclic adducts depending on the ligand. Diynes bearing both a terminal and an internal triple bond gave exclusive CO2 incorporation into the terminal alkynyl group, regioselectively at the 2-position. The electrocarboxylation of 1,3-diynes with the Ni-PMDTA catalytic system yielded, regio- and stereoselectively, (E)-2-vinylidene-3-yne carboxylic acids in one step. The electrosyntheses were carried out in single-compartment cells fitted with a consumable magnesium anode, and utilized a catalytic amount of an air-stable Ni(II) complex as the catalyst precursor. Cyclic voltammetry studies revealed that both carbon dioxide and the diynes are able to coordinate to LNi(0)-generated species in DMF.
Regio- and Stereoselective Dimerization of Terminal Alkynes to Enynes Catalyzed by a Palladium/Imidazolium System
作者:Chuluo Yang、Steven P. Nolan
DOI:10.1021/jo010837s
日期:2002.1.1
A Palladium/imidazolium chloride system has been used to mediate the dimerization of terminal alkynes to enynes. The combination of 1 mol % Pd(OAc)(2) and 2 mol % IMes.HCl in the presence Of CS2CO3 as base shows high activity and high regio- and steroselectivity for the dimerization of aryl and aliphatic terminal alkynes to enynes.
NORIN, TORBJORN;UNELIUS, C. RIKARD, ACTA CHEM. SCAND., 44,(1990) N, C. 106-107
作者:NORIN, TORBJORN、UNELIUS, C. RIKARD
DOI:——
日期:——
An efficient palladium-catalyzed reaction of vinyl chlorides with terminal acetylenes
作者:Mouad Alami、Gérard Linstrumelle
DOI:10.1016/0040-4039(91)80765-x
日期:1991.10
In the presence of bis(benzonitrile) dichloropalladium and copper iodide, vinyl chlorides react rapidly in piperidine with terminal acetylenes to give conjugated enynes in high yields.