β-Cyclodextrin conjugated magnetic nanoparticles as a novel magnetic microvessel and phase transfer catalyst: synthesis and applications in nucleophilic substitution reaction of benzyl halides

Ionic liquid supported on magnetic nanoparticles (-Fe2O3@SiO2-IL-ZnxCly) as the green catalyst for the Paal-Knorr reaction

“…Từ khóa-Chất lỏng ion, hạt nano từ tính, phản ứng Paal-Knorr, kích hoạt siêu âm 1. GIỚI THIỆU gày nay, xúc tác nano từ tính đang dần trở nên phổ biến bởi những tính chất đặc biệt của chúng mà các loại xúc tác không có được [1][2][3]. Những loại xúc tác này có diện tích bề mặt lớn, thu hồi dễ dàng bằng nam châm, xúc tác từ tính thích hợp làm xúc tác xanh trong tổng hợp hữu cơ [3].…”

“…Những loại xúc tác này có diện tích bề mặt lớn, thu hồi dễ dàng bằng nam châm, xúc tác từ tính thích hợp làm xúc tác xanh trong tổng hợp hữu cơ [3]. Do đó, xúc tác dựa trên hạt nano từ tính đang thu hút sự quan tâm lớn của các nhà khoa học trên thế giới trong lĩnh vực xúc tác [2,3]. Trong khi đó, xúc tác chất lỏng ion mang trên hạt nano từ tính cũng đang được phát triển, bởi sự kết hợp hiệu quả các tính năng của chất lỏng ion và hệ xúc tác dị thể [3].…”

New sporopollenin-based β-cyclodextrin functionalized magnetic hybrid adsorbent for magnetic solid-phase extraction of nonsteroidal anti-inflammatory drugs from water samples

“…CDs are torus-shaped cyclic oligosaccharides with an internal hydrophobic cavity containing 6–12 glucose units joined together by α-1,4-glycosidic linkages [ 30 ]. In the last three decades, CD-based materials have been significantly developed owing to CDs’ unique character which can form noncovalent inclusion complex with other compounds through host–guest interactions by encapsulating either completely or partially fit into the lipophilic cavity [ 31 ]. The cavity of CDs provides a hydrophobic space in which a guest can be sequestered in an aqueous medium.…”

Crown ether functionalized magnetic hydroxyapatite as eco‐friendly microvessel inorganic‐organic hybrid nanocatalyst in nucleophilic substitution reactions: an approach to benzyl thiocyanate, cyanide, azide and acetate derivatives

“…Nowadays, magnetic nanoparticles have attracted considerable interest due to their easy separation and also their remarkable physical and chemical properties . To avoid the aggregation of nanoparticles and to improve their chemical stability, the surface of the nanoparticles has been coated with different materials, such as silica, MCM‐41, polymer and hydroxyapatite . Among them hydroxyapatite, a mineral form of calcium apatite, which is shown by Ca 10 (PO 4 ) 6 (OH) 2 has several unique properties such as lower cost of production, availability and environment friendly nature which can make hydroxyapatite‐encapsulated magnetic nanocrystallites an excellent support for the preparation of heterogeneous catalysts in organic chemistry …”

“…[12][13][14][15] To avoid the aggregation of nanoparticles and to improve their chemical stability, the surface of the nanoparticles has been coated with different materials, such as silica, MCM-41, polymer and hydroxyapatite. [16][17][18][19][20][21][22][23] Among them hydroxyapatite, a mineral form of calcium apatite, which is shown by Ca 10 (PO 4 ) 6 (OH) 2 has several unique properties such as lower cost of production, availability and environment friendly nature which can make hydroxyapatite-encapsulated magnetic nanocrystallites an excellent support for the preparation of heterogeneous catalysts in organic chemistry. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] Crown ethers performing as excellent phase-transfer catalyst in asymmetric reactions have been reported in several papers, with high enantioselectivities and yields observed applying these compounds; in this work, hydroxyapatite coated uniform γ-Fe 2 O 3 core-shell particles were synthesized and crown ether immobilized on an insoluble support presents can lead to the formation of novel nanocomposites, which combines and enhances the characteristics of the components, such as the electronic, thermal, and catalytic properties and molecular recognition of the macrocyclic hosts.…”