MBHA resin-supported tripeptide catalyst system containing L-proline unit has been developed for use in the direct asymmetric aldol reaction of acetone and aldehydes, which afford the corresponding products with satis...MBHA resin-supported tripeptide catalyst system containing L-proline unit has been developed for use in the direct asymmetric aldol reaction of acetone and aldehydes, which afford the corresponding products with satisfactory isolated yields and enantiomeric excesses. 2009 Hong Bin Zou. Published by E]sevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
The ethylenediamine-functionalized resin-supported Pd（0） complex was prepared from PdCl2 and ethylenediamine-functionalized chloromethylated polystyrene, followed by reduction with KBH4. The complex was characterize...The ethylenediamine-functionalized resin-supported Pd（0） complex was prepared from PdCl2 and ethylenediamine-functionalized chloromethylated polystyrene, followed by reduction with KBH4. The complex was characterized by FT-IR, XRD, BET, SEM and EDS. The resin-supported catalyst exhibited high catalytic activity in the Heck reaction and could be reused up to 17 times in NMP or 16 times in DMF at 90 ℃ in the Heck reaction of iodobenzene with acrylic acid. The leaching investigation disclosed that the palladium leaching was caused by the interaction of iodobenzene with the metal Pd（0） on supported catalyst. The leached palladium species in filtrate was very stable and could be reused five times after the solid catalyst was filtered off. A cross-transfer test in recycling in the presence of additional carbon disclosed that the soluble leached palladium species had much higher catalytic activity than supported and/or adsorbed palladium in solid-solution heterogeneous Heck reaction.展开更多
Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the...Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the corresponding 1,2-diols and β-amino alcohols in high yields. The catalyst was facilely prepared and recyclable.展开更多
文摘MBHA resin-supported tripeptide catalyst system containing L-proline unit has been developed for use in the direct asymmetric aldol reaction of acetone and aldehydes, which afford the corresponding products with satisfactory isolated yields and enantiomeric excesses. 2009 Hong Bin Zou. Published by E]sevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘The ethylenediamine-functionalized resin-supported Pd（0） complex was prepared from PdCl2 and ethylenediamine-functionalized chloromethylated polystyrene, followed by reduction with KBH4. The complex was characterized by FT-IR, XRD, BET, SEM and EDS. The resin-supported catalyst exhibited high catalytic activity in the Heck reaction and could be reused up to 17 times in NMP or 16 times in DMF at 90 ℃ in the Heck reaction of iodobenzene with acrylic acid. The leaching investigation disclosed that the palladium leaching was caused by the interaction of iodobenzene with the metal Pd（0） on supported catalyst. The leached palladium species in filtrate was very stable and could be reused five times after the solid catalyst was filtered off. A cross-transfer test in recycling in the presence of additional carbon disclosed that the soluble leached palladium species had much higher catalytic activity than supported and/or adsorbed palladium in solid-solution heterogeneous Heck reaction.
文摘Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the corresponding 1,2-diols and β-amino alcohols in high yields. The catalyst was facilely prepared and recyclable.
