| Parmar, Digvijaysinh K., Butani, Pinal M., Thumar, Niraj J., Jasani, Pinal M., Padaliya, Ravi V., Sandhiya, Paba R., Nakum, Haresh D., Khan, Md. Nasim and Makwana, Dipak 2019. Oxy-functionalization of olefins with neat and heterogenized binuclear V(IV)O and Fe(II) complexes: effect of steric hindrance on product selectivity and output in homogeneous and heterogeneous phase. Molecular Catalysis 474 , 110424. 10.1016/j.mcat.2019.110424 |
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Abstract
Neat {[VO(sal2bz)]2; [Fe(sal2bz)(H2O)2]2·2H2O} and zeolite-Y immobilized {[VO(sal2bz)]2-Y; [Fe(sal2bz)(H2O)2]2-Y} binuclear complexes have been prepared and characterized by spectroscopic techniques (IR, UV–vis), elemental analyses (CHN, ICP-OES), thermal study (TGA), scanning electron micrograph (SEM), adsorption study (BET) and X-ray diffraction (XRD) patterns. Neat (homogeneous) and immobilized (heterogeneous) complexes were employed as catalysts in the oxidation of olefins, namely, cyclohexene, limonene and α-pinene in the presence of 30% hydrogen peroxide. 100% conversion of cyclohexene and α-pinene was obtained while limonene was oxidized up to 90%. Homogeneous catalysts showed highly selective result as neat [VO(sal2bz)]2 complex has provided 87% cyclohexane-1,2-diol and neat [Fe(sal2bz)(H2O)2]2·2H2O complex has provided 79% verbenone in oxidation of cyclohexene and α-pinene, respectively. We have observed that due to steric hindrance, formation of olefinic oxidation products increases on moving from α-pinene to limonene and limonene to cyclohexene. Additionally. recovered heterogeneous catalysts showed intact results up to two consecutive runs. Probable catalytic mechanism has been proposed for oxidation of cyclohexene.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Chemistry |
| ISSN: | 2468-8231 |
| Date of First Compliant Deposit: | 10 July 2019 |
| Date of Acceptance: | 23 May 2019 |
| Last Modified: | 17 Nov 2024 05:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/124111 |
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