79655-47-3Relevant articles and documents
AgNPs encapsulated by an amine-functionalized polymer nanocatalyst for CO2 fixation as a carboxylic acid and the oxidation of cyclohexane under ambient conditions
Salam, Noor,Paul, Priyanka,Ghosh, Swarbhanu,Mandi, Usha,Khan, Aslam,Alam, Seikh Mafiz,Das, Debasis,Manirul Islam, Sk.
, p. 5448 - 5456 (2020/04/17)
Silver nanoparticles (AgNPs) embedded in a porous polystyrene material (AgNPs@m-PS-PC) were synthesized via the polymerization of polystyrene amine and 2-pyridinecarbaldehyde, followed by the reduction of silver nitrate in methanol. The structure and morphology of this porous material were characterized by powder X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy, Fourier-transform infrared, ultraviolet-visible, and atomic absorption spectroscopies, and thermogravimetric analysis. TEM showed that the AgNPs were well dispersed in the polymeric matrix, with dimensions of around 4-9 nm. This nanocatalyst showed activity, particularly for the green synthesis of valuable carboxylic acids by the carboxylation reaction of terminal alkynes with carbon dioxide under atmospheric pressure. Additionally, the catalyst displayed efficient catalytic activity for the oxidation of cyclohexane using hydrogen peroxide as the oxidising agent. The AgNPs@m-PS-PC nanocatalyst could be recycled five times and retained reliable efficiency.
Practical synthesis of unsymmetrical diarylacetylenes from propiolic acid and two different aryl bromides
Tartaggia, Stefano,De Lucchi, Ottorino,Goossen, Lukas J.
supporting information; experimental part, p. 1431 - 1438 (2012/04/04)
A palladium catalyst that mediates the one-pot sequential Sonogashira and decarboxylative coupling of propiolic acid with two different aryl bromides has been developed. Selective coupling of the first aryl bromide was achieved in the presence of a copper-free, monometallic catalyst generated in situ from allylpalladium chloride dimer and SPhos with tetra-n-butylammonium fluoride as the base in an N-methyl-2-pyrrolidone/water solvent mixture. Upon addition of another aryl bromide and raising the temperature from 50 to 80°C, the intermediate arylpropiolic acid underwent decarboxylative coupling to give the corresponding diarylacetylene. Thus, the new system permits a one-pot three-component synthesis of unsymmetrical diarylacetylenes from widely available aryl bromides, rather than expensive aryl iodides, and propiolic acid, rather than (trimethylsilyl)acetylene, as an inexpensive and easy-to-handle acetylene synthon. The process is highly selective, modular, and gives access to a wide range of unsymmetrical diarylacetylenes in good yields. A palladium-catalyzed three component synthesis of diaryl acetylenes has been optimized. Several disubstituted alkynes have been prepared from two different arylbromides and propiolic acid in good yields. Copyright
