Kobra Azizi - Academia.edu (original) (raw)
Papers by Kobra Azizi
Applied Organometallic Chemistry, 2015
ABSTRACT
Tetrahedron Letters, 2014
ChemInform, 2014
Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as ... more Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as an efficient catalyst for the direct oxidation of secondary amines to nitrones with hydrogen peroxide as the oxidant. The catalyst could be recycled up to four times without significant loss of activity.
Applied Catalysis A: General, 2014
ABSTRACT
RSC Advances, 2014
ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hy... more ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hydrochloride) on the surface of silica-encapsulated γ-Fe2O3 nanoparticles. Its capability was evaluated in the acylation of alcohols and phenols with acetic anhydride under solvent-free conditions and afforded the desired products in high yield. This novel magnetic organocatalyst could be separated from the reaction vessel by use of an external magnet and recovered 5 times without a significant loss of its activity. The amount of loaded vitamin B1 on the silica-encapsulated γ-Fe2O3 was assigned by TGA and confirmed by back titration. Availability, cheapness and low toxicity are reasons associated with the utilization of vitamin B1 as a catalyst. The catalyst has been characterized by FT-IR, XRD, SEM, VSM and TG/DTA.
Tetrahedron Letters, 2015
ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-di... more ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-dicarbonyl compounds is developed using tert-butyl hydroperoxide as an oxidant. In general, the enol carbamates are synthesized in excellent yields (up to 92%) under the optimized reaction conditions. Fe3O4@EDTA–Cu(II) has the advantage of being magnetically recoverable. Also, we have established a highly efficient Fe3O4@EDTA–Cu(II)-catalyzed tandem reaction of 2-iodoanilines with isothiocyanates for the synthesis of 2-aminobenzothiazoles.
Arabian Journal of Chemistry, 2012
ABSTRACT
RSC Adv., 2014
ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a serie... more ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a series of chromene derivatives via cyclocondensation of β-naphthole, malononitrile and aromatic aldehydes, in the presence of arginine-immobilized magnetic nanoparticles, under ultrasound irradiation, in high yields. This catalyst can be easily separated from the reaction by external magnet and recycled four times without its activity loss. This methodology has shown shorter reaction times when compared with conventional thermal heating.
Chemical Science Transactions, 2012
Chemical Science Transactions, 2012
... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, ... more ... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, 128.1 (2C), 128.2 (2C), 128.3, 128.4, 132.2, 141.8, 153.0, 168.5 ppm; IR (KBr, cm-1): 3421, 3230, 2922, 1638, 1516, 1438, 1334, 810, 741; MS (EI, 70 eV) m/z (%) = 319 (M+, 28 ...
Tetrahedron Letters, 2014
ABSTRACT
Tetrahedron Letters, 2013
Research on Chemical Intermediates, 2014
Research on Chemical Intermediates, 2013
Research on Chemical Intermediates, 2014
Research on Chemical Intermediates, 2013
Applied Organometallic Chemistry, 2015
ABSTRACT
Tetrahedron Letters, 2014
ChemInform, 2014
Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as ... more Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as an efficient catalyst for the direct oxidation of secondary amines to nitrones with hydrogen peroxide as the oxidant. The catalyst could be recycled up to four times without significant loss of activity.
Applied Catalysis A: General, 2014
ABSTRACT
RSC Advances, 2014
ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hy... more ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hydrochloride) on the surface of silica-encapsulated γ-Fe2O3 nanoparticles. Its capability was evaluated in the acylation of alcohols and phenols with acetic anhydride under solvent-free conditions and afforded the desired products in high yield. This novel magnetic organocatalyst could be separated from the reaction vessel by use of an external magnet and recovered 5 times without a significant loss of its activity. The amount of loaded vitamin B1 on the silica-encapsulated γ-Fe2O3 was assigned by TGA and confirmed by back titration. Availability, cheapness and low toxicity are reasons associated with the utilization of vitamin B1 as a catalyst. The catalyst has been characterized by FT-IR, XRD, SEM, VSM and TG/DTA.
Tetrahedron Letters, 2015
ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-di... more ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-dicarbonyl compounds is developed using tert-butyl hydroperoxide as an oxidant. In general, the enol carbamates are synthesized in excellent yields (up to 92%) under the optimized reaction conditions. Fe3O4@EDTA–Cu(II) has the advantage of being magnetically recoverable. Also, we have established a highly efficient Fe3O4@EDTA–Cu(II)-catalyzed tandem reaction of 2-iodoanilines with isothiocyanates for the synthesis of 2-aminobenzothiazoles.
Arabian Journal of Chemistry, 2012
ABSTRACT
RSC Adv., 2014
ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a serie... more ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a series of chromene derivatives via cyclocondensation of β-naphthole, malononitrile and aromatic aldehydes, in the presence of arginine-immobilized magnetic nanoparticles, under ultrasound irradiation, in high yields. This catalyst can be easily separated from the reaction by external magnet and recycled four times without its activity loss. This methodology has shown shorter reaction times when compared with conventional thermal heating.
Chemical Science Transactions, 2012
Chemical Science Transactions, 2012
... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, ... more ... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, 128.1 (2C), 128.2 (2C), 128.3, 128.4, 132.2, 141.8, 153.0, 168.5 ppm; IR (KBr, cm-1): 3421, 3230, 2922, 1638, 1516, 1438, 1334, 810, 741; MS (EI, 70 eV) m/z (%) = 319 (M+, 28 ...
Tetrahedron Letters, 2014
ABSTRACT
Tetrahedron Letters, 2013
Research on Chemical Intermediates, 2014
Research on Chemical Intermediates, 2013
Research on Chemical Intermediates, 2014
Research on Chemical Intermediates, 2013