Reaction Mechanism In Organic Chemistry By Mukul C Ray.pdf !!LINK!!
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The oxidation rate of aryl-methanol catalyzed by the magnetic nanocatalysts is studied with a stopped-flow spectrophotometer. The results indicate that the oxidation activity of nanorods can be much higher than that of octahedrons.The reaction is conducted under mild conditions and proceeds at room temperature (RT) in air within 30 min. The oxidation pathway of 2-chlorophenol by nanorods and octahedrons was qualitatively confirmed by GC/MS, GC-MS/MS and GC-FID analyses. The nano-catalysts can easily be recovered from the reaction mixture and reused.
Selective oxidation of aryl-methanol and vinyl-arene were carried out in the presence of the magnetic nanocatalysts. The nanocatalysts exhibit excellent catalytic activity and the corresponding oxidation products were isolated and characterized. The results demonstrate that the magnetic nanocatalysts have a great potential in industrial organic oxidation.
The excellent magnetic properties of iron oxide nanorods have been observed by VSM and SQUID methods. The oxidation of phenyl-methanol and phenyl-vinyl ketone by iron nanorods was investigated and the products were isolated and characterized by NMR spectra. The oxidation reaction of phenyl-methanol occurred via phenoxyl radicals formation and the oxidation of phenyl-vinyl ketone occurred via formation of phenoxyl radicals, and carbon-centered radicals and lead to the formation of benzyl radicals and phenol. The oxidation of aryl-methanol and vinyl-arene by iron nanorods was also studied. The results show that phenol is the predominant product from the reaction of phenyl-methanol and phenyl-vinyl ketone, and the oxidation of aryl-methanol and vinyl-arene by iron nanorods is consistent with the radical model. Thus, iron oxide nanorods are considered as promising catalysts for the selective oxidation of phenyl-methanol and phenyl-vinyl ketone.
The structural and morphological characteristics of the nanocrystals were well investigated by TEM and XRD technique. The size and shape of the nanocrystals are controlled by changing the molar ratio of the iron and reducing agent. For the oxidation reactions of the different aryl-methanol and vinyl-arene, only nanorod shaped catalyst was found suitable as compared with octahedron shaped catalyst.
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