The complex [Rh（CO）（Pz）（TPPMS）]2, （TPPMS = m-sulfonatophenyl-diphenylphosphine, Pz = Pirazolate） was evaluated as a catalyst precursor in the hydroformylation of allylbenzenes （eugenol and estragol） and terp...The complex [Rh（CO）（Pz）（TPPMS）]2, （TPPMS = m-sulfonatophenyl-diphenylphosphine, Pz = Pirazolate） was evaluated as a catalyst precursor in the hydroformylation of allylbenzenes （eugenol and estragol） and terpenes （limonene and myrcene） and in the hydrogenation of α,β-unsaturated aldehydes （crotonaldehyde, cinnamaldehyde and citral） in a biphasic medium toluene/ionic liquid. Under the reaction conditions studied （P = 600 psi, T= 95 ℃, S/C = 300：1）, the rhodium system showed a high activity and selectivity towards the desired aldehydes. The catalytic phase could be recycled up to five times without any evident loss of activity or selectivity.展开更多
A facile and efficient protocol for the synthesis of 3,4-dihydropyrimidones via one-pot Biginelli reaction in PEG1000-DAIL/toluene system was developed. PEG1000-DAIL/toluene mixture is a temperature-driven reversible ...A facile and efficient protocol for the synthesis of 3,4-dihydropyrimidones via one-pot Biginelli reaction in PEG1000-DAIL/toluene system was developed. PEG1000-DAIL/toluene mixture is a temperature-driven reversible b/phasic system, which promises the fully display of catalytic activity and simple recycle of PEGI0oo-DAIL. As a re- suit, PEG1000-DAIL/toluene mixture showed catalyst-medium double-duty in the Biginelli reaction and afforded cor- responding 3,4-dihydropyrimidones in excellent yields of activity was observed even after 10 recycling, runs. 80%---95% for 20 examples. No obvious loss of catalytic展开更多
Palladium nanoparticles immobilized on a cross-linked imidazolium-containing polymer were evaluated as a catalyst for Suzuki carbon-carbon cross-coupling reactions using water as the solvent. The nanocatalysts show go...Palladium nanoparticles immobilized on a cross-linked imidazolium-containing polymer were evaluated as a catalyst for Suzuki carbon-carbon cross-coupling reactions using water as the solvent. The nanocatalysts show good catalytic activities for aryl iodides and aryl bromides and moderate activity with aryl chloride substrates. Coupling of sterically hindered substrates could also be achieved in reasonable yields. The heterogeneous catalyst is stable, can be stored without precautions to exclude air or moisture, and can be easily recycled and reused.展开更多
文摘The complex [Rh（CO）（Pz）（TPPMS）]2, （TPPMS = m-sulfonatophenyl-diphenylphosphine, Pz = Pirazolate） was evaluated as a catalyst precursor in the hydroformylation of allylbenzenes （eugenol and estragol） and terpenes （limonene and myrcene） and in the hydrogenation of α,β-unsaturated aldehydes （crotonaldehyde, cinnamaldehyde and citral） in a biphasic medium toluene/ionic liquid. Under the reaction conditions studied （P = 600 psi, T= 95 ℃, S/C = 300：1）, the rhodium system showed a high activity and selectivity towards the desired aldehydes. The catalytic phase could be recycled up to five times without any evident loss of activity or selectivity.
基金Supported by the National Natural Science Foundation of China（No.21002050）.
文摘A facile and efficient protocol for the synthesis of 3,4-dihydropyrimidones via one-pot Biginelli reaction in PEG1000-DAIL/toluene system was developed. PEG1000-DAIL/toluene mixture is a temperature-driven reversible b/phasic system, which promises the fully display of catalytic activity and simple recycle of PEGI0oo-DAIL. As a re- suit, PEG1000-DAIL/toluene mixture showed catalyst-medium double-duty in the Biginelli reaction and afforded cor- responding 3,4-dihydropyrimidones in excellent yields of activity was observed even after 10 recycling, runs. 80%---95% for 20 examples. No obvious loss of catalytic
基金supported by the Ecole Polytechnique Fédérale de Lausanne and the Iranian Ministry of Science,Research and Technology(to S.G.-E.)
文摘Palladium nanoparticles immobilized on a cross-linked imidazolium-containing polymer were evaluated as a catalyst for Suzuki carbon-carbon cross-coupling reactions using water as the solvent. The nanocatalysts show good catalytic activities for aryl iodides and aryl bromides and moderate activity with aryl chloride substrates. Coupling of sterically hindered substrates could also be achieved in reasonable yields. The heterogeneous catalyst is stable, can be stored without precautions to exclude air or moisture, and can be easily recycled and reused.
