12 research outputs found
“Silylation-desilylation of propargyl tosylamides: easy sinthesis of a,ß-unsaturated aldehydes and ß-lactams”
“Sililformilazione/Desililazione di alchini terminali: nuove vie di sintesi di derivati aldeidici”
The ra structure of tellurophene-2-carboxaldehyde by using the proton NMR spectrum in an oriented phase including carbon-13 and tellurium-125 satellites
Different NMR Approaches to the Chiral Analysis of Trisubstituted Allenes Devoid of Polar Functional Groups and Aromatic Hydrocarbons
Permethylated cyclodextrins as chiral solvating agents for the determination of the enantiomeric composition of apolar substrates by NMR
The efficiency of hexakis(2,3,6-tri-O-methyl)--cyclodextrin (TRIMEA) and heptakis(2,3,6-tri-O-methyl)--cyclodextrin (TRIMEB) as CSAs for the determination by NMR of the enantiomeric composition of trisubstituted allenes and aromatic hydrocarbons has been compared in CD3OD as solvent: their complementary use allows the analysis of a large range of substrates to be carried ou
Hydrosilylation of acetylenic substrates promoted by solvated platinum atoms derived catalysts
"Metal vapour derived supported palladium catalysts for Sonogashira carbonylative reactions"
MVS-derived palladium nanoparticles deposited on polydimethylphosphazene as recyclable catalysts for Heck-type reactions: preparation, structural study, and catalytic activity
Palladium nanoparticles, obtained by the metal vapor synthesis (MVS) technique, were deposited on polydimethylphosphazene (PDMP). The Pd/PDMP system showed high catalytic activity in the Heck C–C coupling of iodobenzene and methyl acrylate, with greater activity than com- mercially available catalysts such as Pd(OAc)2 and Pd on carbon. The Pd/PDMP is soluble in the reaction solvent, 1-methyl-2-pyrrolidinone, and can be quantitatively recovered at the end of the reaction by precipitation without loss of metal. When reused, the recovered Pd/PDMP retains its catalytic activity. A multinuclear (31P, 13C, 15N) solid-state NMR study identified and characterized the strong structural and dynamic mod- ifications induced by Pd nanoparticles on PDMP. Moreover, solid-state NMR studies and HRTEM analyses, performed on the pristine catalyst and on the catalyst recovered after the reaction, highlighted the almost complete structural invariability of the Pd/PDMP, pointing out the high stability toward agglomeration of the palladium nanoparticles in such a system. Pd/PDMP in the presence of triphenylphosphine was also active in the alkylative cyclization of 7-octen-1-ynes, an important C–C coupling reaction to obtain substituted 1,2-bis(alkylidene)cyclohexanes, which are valuable building blocks in fine chemistry