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Application of polymer-bound Cu(II) complex of 2-phenylbenzimidazole towards oxidative bromination and oxidative esterification of organic substrates

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Title Application of polymer-bound Cu(II) complex of 2-phenylbenzimidazole towards oxidative bromination and oxidative esterification of organic substrates
 
Creator E R, Shilpa
V, Gayathri
 
Subject Cu(II) phenylbenzimidazole
Methyl benzoate
Oxidative bromination
Oxidative esterification
 
Description 506-517
Application of polymer immobilized Cu(II)(PS-Cu(II)PBMZL) complex of 2-phenylbenzimidazole in oxidative
bromination and oxidative esterification of organic compounds is reported. The complex has been characterized by CHNS
analysis, UV-Vis/DRS, FT-IR, ESR spectroscopic studies, magnetic moment measurements and TG analysis. A shift in
νC=N in the polymer-bound complex compared with the ligand indicates its complexation to Cu(II) center. A distorted
octahedral coordination of Cu(II) in PS-Cu(II)PBMZL is confirmed by the electronic spectral data and the efficient binding
of PBMZL is ascertained by adecrease in the intensity of νCH2Cl peak in the PS-PBMZL compared to the polymer support.
An array of experiments has been carried out to assess the influence of various reaction parameters on the performance of
PS-Cu(II)PBMZL. The activity of the polymer-bound complex is higher than the unbound complex. In the case of oxidative
bromination, PS-Cu(II)PBMZLH displayed a 65% phenol conversion with 61% 2-bromophenol selectivity. The %
benzaldehyde conversion and methyl benzoate selectivity in the case of oxidative esterification has been found to be 79 and
82%. Compiling all these results along with the knowledge obtained regarding the most probable reactive species, tentative
mechanisms have been proposed.
 
Date 2021-12-24T06:11:40Z
2021-12-24T06:11:40Z
2021-09
 
Type Article
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscair.res.in/handle/123456789/58698
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJCT Vol.28(5) [September 2021]