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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: heterogeneous catalyst,Oxidation,Porphyrin,Alcohols,Polyoxometalate,Hybrid material
- چکیده:
- چکیده انگلیسی: Efficient and selective oxidation of alcohols with NaIO4 catalyzed by an organic-inorganic hybrid material in which manganese(III)5,10,15,20-tetrakis(4-aminophenyl)porphyrin chloride, MnIII(TAPP)Cl, is covalently linked to a Lindqvist structure of polyoxometalate, Mo6O192-, at room temperature is reported. The effect of various parameters such as catalyst amount, solvent and oxidant were studied. The catalyst, MnP-POM, showed high activity not only in the oxidation of benzylic and linear alcohols but also in the oxidation of secondary alcohols and their corresponding ketones were obtained in good yields. A good selectivity observed in the case of cinnamyl alcohol and the only alcoholic group is oxidized and no epoxide was obtained. The MnP-POM catalyst is stable under the reaction conditions and While, the homogeneous MnIII(TAPP)Cl cannot recover even one time, the hybrid catalyst can be filtered and reused several times without significant loss of its initial activity. Covalent linkage of the MnIII(TAPP)Cl to the POM provide way of stabilizing the metalloporphyrin against deactivation during the catalytic cycles
- انتشار مقاله: 10-04-1395
- نویسندگان: Mehdi Araghi,Mehdi Araghi,Mehdi Araghi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: heterogeneous catalyst,Oxidation,Molybdenumacetylacetonate,Multi-wall carbon nanotubes
- چکیده:
- چکیده انگلیسی: In the present work, highly efficient oxidation of sulfides catalyzed by MoO2(acac)2 supported on multi-wall carbon nanotubes, MWCNTs, modified with 1,2-diaminobenzene (DAB) and 2-aminophenol (AP), at room temperature are reported. The effects of various parameters such as reaction time, solvent, catalyst amount, oxidant, etc, were studied. These heterogenized catalysts showed high activity in the oxidation of a variety of linear, cyclic and aromatic sulfides with tert-butyl hydroperoxide (TBHP) in 1,2-dichloroethane as solvent under mild conditions. In these systems sulfides have been selectively oxidized to the corresponding sulfoxides and sulfones with short reaction times and high yields. In the case of aromatic sulfides, sulfoxide was produced as major product and in the case of linear sulfides only sulfoxide was produced. The [MoO2(acac)@amines-MWCNT] catalysts are stable under the reaction conditions and While, the homogeneous MoO2(acac)2 cannot recovered even one time, the MWCNT supported catalysts can be filtered and reused several times without significant loss of their activity.
- انتشار مقاله: 31-01-1393
- نویسندگان: Mehdi Araghi,Shaghayegh Aghamohammad
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: heterogeneous catalyst,Oxidation,Porphyrin,Alcohols,Polyoxometalate,Hybrid material
- چکیده:
- چکیده انگلیسی: Efficient and selective oxidation of alcohols with NaIO4 catalyzed by an organic-inorganic hybrid material in which manganese(III)5,10,15,20-tetrakis(4-aminophenyl)porphyrin chloride, MnIII(TAPP)Cl, is covalently linked to a Lindqvist structure of polyoxometalate, Mo6O192-, at room temperature is reported. The effect of various parameters such as catalyst amount, solvent and oxidant were studied. The catalyst, MnP-POM, showed high activity not only in the oxidation of benzylic and linear alcohols but also in the oxidation of secondary alcohols and their corresponding ketones were obtained in good yields. A good selectivity observed in the case of cinnamyl alcohol and the only alcoholic group is oxidized and no epoxide was obtained. The MnP-POM catalyst is stable under the reaction conditions and While, the homogeneous MnIII(TAPP)Cl cannot recover even one time, the hybrid catalyst can be filtered and reused several times without significant loss of its initial activity. Covalent linkage of the MnIII(TAPP)Cl to the POM provide way of stabilizing the metalloporphyrin against deactivation during the catalytic cycles
- انتشار مقاله: 10-04-1395
- نویسندگان: Mehdi Araghi,Mehdi Araghi,Mehdi Araghi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: heterogeneous catalyst,Oxidation,Molybdenumacetylacetonate,Multi-wall carbon nanotubes
- چکیده:
- چکیده انگلیسی: In the present work, highly efficient oxidation of sulfides catalyzed by MoO2(acac)2 supported on multi-wall carbon nanotubes, MWCNTs, modified with 1,2-diaminobenzene (DAB) and 2-aminophenol (AP), at room temperature are reported. The effects of various parameters such as reaction time, solvent, catalyst amount, oxidant, etc, were studied. These heterogenized catalysts showed high activity in the oxidation of a variety of linear, cyclic and aromatic sulfides with tert-butyl hydroperoxide (TBHP) in 1,2-dichloroethane as solvent under mild conditions. In these systems sulfides have been selectively oxidized to the corresponding sulfoxides and sulfones with short reaction times and high yields. In the case of aromatic sulfides, sulfoxide was produced as major product and in the case of linear sulfides only sulfoxide was produced. The [MoO2(acac)@amines-MWCNT] catalysts are stable under the reaction conditions and While, the homogeneous MoO2(acac)2 cannot recovered even one time, the MWCNT supported catalysts can be filtered and reused several times without significant loss of their activity.
- انتشار مقاله: 31-01-1393
- نویسندگان: Mehdi Araghi,Shaghayegh Aghamohammad
- مشاهده