Bismuth(III)chloride as a New Catalyst for Knoevenagel Condensation in the Absence of Solvent
作者:Dipak Prajapati、Jagir S. Sandhu
DOI:10.1246/cl.1992.1945
日期:1992.10
The Knoevenagel condensation of various aldehydes was carried out under heterogenous catalysts conditions using bismuth(III)chloride in absence of solvent. The method gives high yields of Knoevenagel products.
A Novel Multicomponent Reaction Involving Isocyanide, Dimethyl Acetylenedicarboxylate (DMAD), and Electrophilic Styrenes: Facile Synthesis of Highly Substituted Cyclopentadienes
作者:Vijay Nair、Rajeev S. Menon、P. B. Beneesh、V. Sreekumar、S. Bindu
DOI:10.1021/ol036491k
日期:2004.3.1
Alkyl isocyanides, DMAD, and various activated styrenes furnish fully substituted cyclopentadienes in a one-pot three-component reaction. [reaction: see text]
The use of electroosmotic flow as a pumping mechanism for semi-preparative scale continuous flow synthesis
作者:Charlotte Wiles、Paul Watts、Stephen J. Haswell
DOI:10.1039/b614559k
日期:——
By employing a series of reactions we demonstrate the use of electroosmotic flow as a continuous pumping mechanism suitable for semi-preparative scale synthesis, affording an array of small organic compounds, of analytical purity, with yields ranging from 0.57–1.71 g h−1.
Use of a solid hydrotalcite structure incorporating fluorides for basic catalysis of michael or knoevenagel reactions
申请人:Figueras Francois
公开号:US20050250963A1
公开(公告)日:2005-11-10
The invention concerns the use of a solid basic catalyst comprising a hydrotalcite structure wherein part at least of the compensating anions are fluoride anions F
−
for producing Knoevenagel of Michael condensation reactions. The invention also concerns novel solid basic catalysts comprising a hydrotalcite structure characterised by a Mg/Al molar ratio ranging between 2.5 and 3.8 wherein at least part of the compensating anions are fluoride anions F
−
, and methods for preparing said novel catalysts.
Functionalised ionic liquids: synthesis of ionic liquids with tethered basic groups and their use in Heck and Knoevenagel reactions
作者:Stewart A. Forsyth、Ute Fröhlich、Peter Goodrich、H. Q. Nimal Gunaratne、Christopher Hardacre、Angela McKeown、Kenneth R. Seddon
DOI:10.1039/b9nj00729f
日期:——
A simple and efficient synthesis of a novel series of ionic liquids bearing nucleophilic (Me2N) and non-nucleophilic base (iPr2N) functionalities is described. The non-nucleophilic base functionality resembles the structure of the Hünig's base (N,N-diisopropylethylamine), which has been used widely in organic synthesis. A qualitative measure of the basicity of these ionic liquids is presented by utilising their interaction with universal indicator. The basicity of these ionic liquids was found to be dependent on the amine tether and choice of linker between the two nitrogen centres. The relative base strength of these ionic liquids was also probed by using them as catalysts in the Heck and Knoevenagel reactions.