A facile method for the synthesis of leach proof and earth-abundant non-noble Ni nanoparticles on N-doped carbon nanotubes is reported. The catalyst was synthesized by an impregnation-carbonization method wherein the...
The
gram-scale synthesis of important flavoring ketones via alkylation
of acetoacetic ester on substituted benzylic carbon followed by decarboxylation
using a heterogeneous, commercial, solid acid catalyst is reported.
The flavoring ketones were synthesized by the alkylation of acetoacetic
ester, which proceeds through an SN1-type reaction to generate
an alkylated (β-ketoester) intermediate at the benzylic carbon,
which is decarboxylated under the acidic condition. Among the solid
acid catalysts used, Amberlyst-15 was found to be the best catalyst
under the solvent-free condition. This protocol was successfully employed
for the synthesis of various flavoring ketones such as raspberry ketone
and ginger ketone with almost complete conversion and 82% isolated
yield. The para-donating groups on the benzylic alcohol showed a high
rate of reaction. The catalyst was easily recovered and reused 6 times
without losing its activity and selectivity. Moreover, this reaction
was demonstrated at a 10 g scale, which implicated the potential applicability
of the protocol in the industry.
A single step synthetic procedure for carbon microspheres from agricultural waste residue (sugarcane bagasse) by low-temperature hydrothermal carbonization using oxalic acid as a hydrating/dehydrating agent is developed. The FTIR and XPS spectroscopy analysis indicates the presence of −OH, −COOH, and CO functional groups on the surfaces of carbon spheres. These functional groups of the carbon spheres were utilized as a novel route to anchor 3aminopropyl-triethoxysilane and 3-(2-aminoethylamino)propyl)-trimethoxysilane via condensation of triethoxy/ trimethoxy silanes for the synthesis of organo base supported on carbon catalysts. The catalytic activity of the obtained supported organo-base catalyst was demonstrated for C−C bond forming (Henry) reaction. Among all prepared catalysts, 3-(2-aminoethylaminopropyl)-trimethoxysilane grafted in toluene showed high conversion (up to 100%) of aldehydes with excellent selectivity toward β-nitrostyrene. The catalyst was reused five times without losing significant activity for the same reaction.
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