Zeolites catalyze the halogen exchange reaction of alkyl halides

Abstract

Simple aluminosilicates, including NaX and NaY zeolites, catalyze the selective halogen exchange reaction between two different alkyl organohalides, either in batch or in flow, without any additive or solvent, simply...

Cyclododecene isomeric separation by (supported) rhodium(i)-catalysed selective dehydrogenative borylation reaction

“…22 Besides, zeolite NaY contains a ∼5 wt% Na + cations within its framework, able to react with the Cl − anions of the complex and remove the unnecessary and unselective halide. 23…”

“…22 Besides, zeolite NaY contains a ∼5 wt% Na + cations within its framework, able to react with the Cl − anions of the complex and remove the unnecessary and unselective halide. 23 The incorporation of [Rh(COD)Cl] 2 in zeolite NaY was carried out in two different loadings (0.5 and 5 wt%) by the wetness impregnation method [0.5%RhL@NaY and 5% RhL@NaY respectively, see Experimental section], to avoid any loss of precious metal, and the resulting solid was characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), powder X-ray diffraction (PXRD), Brunauer-Emmett-Teller surface area (BET), diffuse-reflectance ultraviolet visible spectrophotometry (DR-UVvis), Fourier transformed infrared spectroscopy (FT-IR), X-ray energy dispersive spectroscopy (EDS) coupled to high-angle-annular-dark field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectrometry (XPS) and field emission scanning electron microscopy (FE-SEM), and also by 29 Si and 27 Al solid-state magic angle spinning nuclear magnetic resonance ( 29 Si and 27 Al SS-MAS NMR). ICP-AES analyses confirmed the incorporation of Rh in the solid (5% RhL@NaY: 2.9 wt% of pure Rh) and the PXRD technique confirmed the integrity of the faujasite zeolite crystallinity after Rh incorporation (Fig.…”

Electrocatalytic dehalogenation in the applications of organic synthesis and environmental degradation

“…The functional groups conversion includes halogenation of alcohols, 25 halogen exchange reaction, 26,27 halogenations of sulfonate esters, 28 reaction of carboxylic acid and its salts with halogens, 29 transformation of amino groups 30 and so on. 31,32 The path of functional groups conversion is suitable for the synthesis of sitespecific halogenated organic compounds with high selectivity.…”

Covalent bonding of N‐hydroxyphthalimide on mesoporous silica for catalytic aerobic oxidation of p‐xylene at atmospheric pressure

“…Unfortunately, the resulting polymer structures showed low thermal stability and required a prolonged induction time needed to swell and open an access to the catalytically active NHPI groups located between the polymer chains. To better disperse the active sites and increase their stability, we decided to use a similar strategy of binding NHPI species to attach them to the surface of mesoporous SBA‐15 silica characterized by robustness and inertness towards oxidation reactions as well as good diffusion properties [4b,18c–e] . In this work, NHPI moieties immobilization by the formation of O−Si−C bonds, allowing to achieve a high catalytic performance and stability during the industrial aerobic oxidation of p ‐xylene at atmospheric pressure (avoiding the safety issues associated to highly‐pressurized oxygen systems [18f] ), is developed.…”