- Extended architectures constructed of thiourea-modified SBA-15 nanoreactor: A versatile new support for the fabrication of palladium pre-catalyst
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We designed and synthesized a novel catalyst consisting of ordered mesoporous silica (SBA-15) functionalized with bis(thiourea) (BTU) linker. The regular and unique pore channels of BTU-SBA-15 ensure proper control of the size and homogeneous distribution of palladium nanoparticles. The physiochemical properties of the hybrid Pd?BTU-SBA-15 pre-catalyst were investigated using various techniques. The proposed catalyst is found to be very active, reusable, stable and scalable, and has excellent reactivity and selectivity for Suzuki and Heck coupling reactions under very mild and sustainable reaction conditions.
- Alamgholiloo, Hassan,Noroozi Pesyan, Nader,Rostamnia, Sadegh
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- Thiourea bridged periodic mesoporous organosilica with ultra-small Pd nanoparticles for coupling reactions
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A synthesis of thiourea-bridged mesoporous organosilica is reported. Using transmission electron microscopy, low-angle XRD measurements and N2 adsorption-desorption isotherms the formation of a highly ordered mesoporous structure with a high surface area (>400 m2 g-1) has been confirmed. Deposition of Pd nanoparticles inside the mesopores resulted in a material that showed excellent catalytic activity in a Suzuki-coupling reaction and retained this activity over several consecutive runs.
- Doustkhah, Esmail,Rostamnia, Sadegh,Imura, Masataka,Ide, Yusuke,Mohammadi, Shiva,Hyland, Christopher J. T.,You, Jungmok,Tsunoji, Nao,Zeynizadeh, Behzad,Yamauchi, Yusuke
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p. 56306 - 56310
(2017/12/26)
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- N,N'-Bis(3-trialkylsilylpropyl)- and N,N'-Bis(3-trialkoxysilylpropyl)thiocarbamides and Their Derivatives
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N,N'-Bis(3-trialkylsilylpropyl)- and N,N'-bis(3-trialkoxysilylpropyl)thiocarbamides were prepared by the reaction of (3-aminopropyl)trialkyl- and (3-aminopropyl)trialkoxysilanes with thiocarbamide and ammonium thiocyanate at 170-180 deg C at a 2:1 molar ratio. The products were converted to isothiouronium salts by treatment with 3-bromo-2-phenylindenone, with showed antithrombic effect. N,N'-Bis(3-triethoxysilylpropyl)thiocarbamide was subjected to hydrolytic polycondensation and used to modify silica gel to obtain PSTM-3 and PSTM-3G organosilicon sorbents. Modification with N,N'-bis(3-triethoxysilylpropyl)thiocarbamide endows varios materials (polymers, glass, ceramic, etc.) water-resisting, fungicidal, and some other useful properties. Cigarette filters impregnated with N,N'-bis(3-triethoxysilylpropyl)thiocarbamide remove carcinogens and toxicants from tobacco smoke.
- Voronkov, M. G.,Vlasova, N. N.,Pestunovich, A. E.
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p. 770 - 774
(2007/10/03)
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