Immobilization of transition-metal hydroxamates on polystyrene resins: Effective biomimetic heterogeneous catalysts for aerobic oxidation of ethylbenzene

Wang, Ruixin; Wang, Hongjing; Wang, Xiaogang; Lei, Caiping; Shi, Xiao-Hui

doi:10.1007/s40242-015-5072-8

Cited by 1 publication

(1 citation statement)

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“…Comparison of the catalytic activity of Fe(opbmzl) 2 ‐Y with other reported systems revealed that the present catalyst exhibits good conversion of aniline (84.4%), cyclohexane (55.6) and ethylbenzene (62.7%) with good selectivity towards para‐substituted product (in this case 4‐bromoaniline) (95.6%), cyclohexanone (42.6%) and acetophenone (53.6%) when compared with reported systems (Tables –) …”

Section: Resultsmentioning

confidence: 74%

Oxidative bromination and oxidation of organic substrates catalyzed by bis[2,2'‐hydroxyphenylbenzimidazole]Fe(III) complex entrapped in zeolite‐Y cavity

Rao

Gayathri

2017

J of Chemical Tech & Biotech

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BACKGROUND Zeolite encapsulated transition metal complexes have proven to be better catalysts for most organic transformations as they share advantages of both homogeneous and heterogeneous catalysts because the complex inside the zeolite cage can move within the cavity but at the same time cannot come out of it owing to its size. Hence, some reports claim application of these encapsulated complexes in various organic transformations. Introduction of bromine into aromatic compounds is an important fundamental reaction in organic chemistry. On the other hand, oxidations of saturated and unsaturated compounds also find application in the synthesis of fine chemicals. RESULTS The positions of peaks in the cyclic voltammogram of the encapsulated complex were unaltered, accompanied by an increase in current with scan rate, substantiating encapsulation of the complex within the cavity. This complex was catalytically active in the presence of H2O2 towards the oxidation of cyclohexane and ethylbenzene. Its catalytic efficiency was examined in the oxidative bromination of organic substrates using KBr at room temperature, wherein high para‐selectivity was obtained. It displayed better conversion/selectivity than Fe(opbmzl)2NO3 retaining its catalytic activity up to five consecutive runs. Plausible mechanisms involving hydro‐peroxo intermediate have been proposed. CONCLUSION Zeolite encapsulated bis[2,2'‐hydroxyphenylbenzimidazole]Fe(III) complex behaved as a versatile catalyst for various organic transformations. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 74%