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Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Beygzadeh, Mojtaba,Kordestani, Davood,Feyzi, Mostafa Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized $Fe_3O_4/SiO_2$ magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), $N_2$ adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized $Fe_3O_4/SiO_2$ nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.
Abdolhamid Alizadeh,Mohammad M. Khodaei,Mojtaba Beygzadeh,Davood Kordestani,Mostafa Feyzi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized Fe3O4/SiO2 magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), N2 adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized Fe3O4/SiO2 nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.
The First Report on Chemoselective Biguanide-Catalyzed Henry Reaction under Neat Conditions
Abdolhamid Alizadeh,Mohammad M. Khodaei,Gisya Abdi,Davood Kordestani 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
An efficient synthetic method for direct Henry reaction catalyzed by a biguanide; namely metformin, as an organosuper-base, between a variety of aromatic and aliphatic aldehydes and nitromethane under neat conditions has been developed. Convenient procedure for removal of the catalyst, chemoselective acquiring of β-nitroalcohols as predominant products, as far as possible short reaction time with excellent conversions are advantages of the developed protocol.
The First Report on Chemoselective Biguanide-Catalyzed Henry Reaction under Neat Conditions
Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Abdi, Gisya,Kordestani, Davood Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
An efficient synthetic method for direct Henry reaction catalyzed by a biguanide; namely metformin, as an organosuper-base, between a variety of aromatic and aliphatic aldehydes and nitromethane under neat conditions has been developed. Convenient procedure for removal of the catalyst, chemoselective acquiring of ${\beta}$-nitroalcohols as predominant products, as far as possible short reaction time with excellent conversions are advantages of the developed protocol.
Majid Abdouss,Ebadullah Asadi,Saman Azodi-Deilami,Davood Kordestani,Alireza Rahimi,Somayeh Asadi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
We prepared high selective imprinted nanoparticle polymers by a miniemulsion polymerization technique,using risperidone as the template, MAA as the functional monomers, and TRIM as the cross-linker in acetonitrileas solvent. The morphology of the nanoparticles determined by scanning electron microscopy (SEM) images and drugrelease, binding properties and dynamic light scattering (DLS) of molecularly imprinted polymers (MIPs) were studied. Controlled release of risperidone from nanoparticles was investigated through in 1% wt sodium dodecyl sulfate aqueoussolution and by measuring the absorbance by HPLC-UV. The results showed that the imprinted nanoparticles exhibiteda higher binding level and slower release rate than non-imprinted nanoparticles, which contributed to interaction ofrisperidone with imprinted cavities within nanoparticles. Furthermore, the results from HPLC showed good precision(5% for 50.0 g L-1) and recoveries (between 86-91) using MIP from human plasma samples.