• 主页
  • 查找结果
  • An efficient heterogeneous Cu-grafted mesoporous organosilicas nanocatalyst for two and three component C-S coupling reactions.

An efficient heterogeneous Cu-grafted mesoporous organosilicas nanocatalyst for two and three component C-S coupling reactions.

Journal of nanoscience and nanotechnology (2013-08-02)
John Mondal, Noor Salam, Asim Bhaumik
摘要

Furfural-imine functionalized mesoporous organosilica material has been synthesized by post-synthesis surface functionalization of 2D-hexagnoal mesoporous SBA-15 with organosilane precursor 3-aminopropyltriethoxy-silane (APTES) followed by Schiff-base condensation with furfural. On the other hand, furfural-imine functionalized MCM-41 has been synthesized by Schiff-base condensation of furfural and 3-aminopropyltriethoxy-silane (APTES) followed by its hydrothermal co-condensation with tetraethylorthosilicate (TEOS) in the presence of a cationic surfactant CTAB. Subsequent reaction of the imine-functionalized mesoporous organosilicas with Cu(OAc)2 in absolute ethanol produced Cu(II)-grafted mesoporous nanocatalysts 1 and 2, respectively. Powder XRD, HR TEM, FE SEM, N2 sorption and EPR experimental tolls are employed to characterize these Cu-grafted furfural-imine functionalized nanocatalysts. Cu-grafted MCM-41 (1) showed very good catalytic efficiency for the coupling of aryl bromides and thiophenol under aerobic conditions to produce different thioethers. On the other hand, Cu-anchored mesoporous SBA-15 nanocatalyst (2) exhibited high catalytic activity for one-pot three component coupling of different aryl halides with thiourea and benzyl bromide in aqueous medium to produce different aryl alkyl thioethers in very good yields. Both Cu-grafted mesoporous nanocatalysts can be efficiently reused for several reaction cycles.

材料
货号
品牌
产品描述

Sigma-Aldrich
二氧化硅, nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis
Sigma-Aldrich
LUDOX® HS-40胶态氧化硅, 40 wt. % suspension in H2O
Sigma-Aldrich
铜, powder, <425 μm, 99.5% trace metals basis
Sigma-Aldrich
LUDOX ® AS-40 胶态二氧化硅, 40 wt. % suspension in H2O
Sigma-Aldrich
二氧化硅, nanoparticles, mesoporous, 200 nm particle size, pore size 4 nm
Sigma-Aldrich
LUDOX® TM-50 胶态氧化硅, 50 wt. % suspension in H2O
Sigma-Aldrich
铜, foil, thickness 0.25 mm, 99.98% trace metals basis
Sigma-Aldrich
铜, powder, 99.999% trace metals basis
Sigma-Aldrich
二氧化硅, nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis
Sigma-Aldrich
介孔结构的二氧化硅, MCM-41 type (hexagonal)
Sigma-Aldrich
铜, wire, diam. 1.0 mm, ≥99.9%
Sigma-Aldrich
LUDOX ® AM 胶态二氧化硅, 30 wt. % suspension in H2O
Sigma-Aldrich
二氧化硅, nanopowder, spec. surface area 175-225 m2/g (BET), 99.8% trace metals basis
Sigma-Aldrich
LUDOX®SM胶体二氧化硅, 30 wt. % suspension in H2O
Sigma-Aldrich
LUDOX ® HS-30 胶态二氧化硅, 30 wt. % suspension in H2O
Sigma-Aldrich
铜, ACS reagent, granular, 10-40 mesh, ≥99.90%
Sigma-Aldrich
LUDOX ® TMA 胶态二氧化硅, 34 wt. % suspension in H2O
Sigma-Aldrich
铜, nanopowder, 60-80 nm particle size (SAXS), ≥99.5% trace metals basis
Sigma-Aldrich
LUDOX ® TM-40 胶态二氧化硅, 40 wt. % suspension in H2O
Sigma-Aldrich
LUDOX ® AS-30 胶态二氧化硅, 30 wt. % suspension in H2O
Sigma-Aldrich
铜, nanopowder, 40-60 nm particle size (SAXS), ≥99.5% trace metals basis
Sigma-Aldrich
铜, powder (spheroidal), 10-25 μm, 98%
Sigma-Aldrich
铜, powder, <75 μm, 99%
Sigma-Aldrich
LUDOX® CL 胶态氧化硅, 30 wt. % suspension in H2O
Sigma-Aldrich
铜, foil, thickness 0.025 mm, 99.98% trace metals basis
Sigma-Aldrich
铜, foil, ≥99.8% (complexometric)
Sigma-Aldrich
铜, foil, thickness 1.0 mm, 99.999% trace metals basis
Sigma-Aldrich
铜, powder (dendritic), <45 μm, 99.7% trace metals basis
Sigma-Aldrich
二氧化硅
Sigma-Aldrich
铜, turnings, purum p.a., ≥99.0%