mojgan samadi - Academia.edu (original) (raw)

Papers by mojgan samadi

Research paper thumbnail of The Synthesis of Allylic Esters via Direct Allylic C–H Bonds Oxidation of Cycloolefins in the Presence of Copper Oxide Nanoparticles and Nanoporous Silica

Nashrieh Shimi va Mohandesi Shimi Iran, Jan 21, 2020

Research paper thumbnail of CCDC 1813681: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Designing chiral amido-oxazolines as new chelating ligands devoted to direct Cu-catalyzed oxidation of allylic C H bonds in cyclic olefins

Tetrahedron, 2018

A new type of amido-oxazoline ligands was conveniently synthesized from inexpensive and commercia... more A new type of amido-oxazoline ligands was conveniently synthesized from inexpensive and commercially available materials in high yields and enantiomeric excesses. The corresponding chiral copper complexes with this class of ligands [C 2 symmetric S,S-bis(amido-oxazoline-Cu(II) complex] were synthesized accordingly. The ORTEP diagram of ligand 6a and complex 6a-copper were compared and characterization of the complex confirmed the involvement of both dentate parts of the ligands, the oxygen and nitrogen atoms, in complexation with copper. The utilization of this amido-oxazoline ligands in the copper-catalyzed enantioselective esterification of allylic CeH bonds of cyclic olefins with tertbutyl-4-nitrobenzoperoxoate resulted in the highest activities, yields (up to 95%) and enantioselectivities (up to 96%) in the presence of HZSM-5 zeolite. These new findings highlight the protocol as one of the most attractive and useful methods for the oxidation of the asymmetric allylic CeH bond of cycloalkenes compared to other methodologies reported in the literature.

Research paper thumbnail of Coronary arteries bypass grafting surgery in elderly patients

The journal of Tehran Heart Center, 2013

The incidence of coronary artery bypass grafting surgery (CABG) in elderly patients has been incr... more The incidence of coronary artery bypass grafting surgery (CABG) in elderly patients has been increasing. There are contradictory reports on the early outcome of elderly coronary artery patients as compared with their young counterparts. We designed this retrospective study to address this issue. We retrospectively analyzed the results of 1489 on-pump CABG cases performed at our hospital during a 4.5-year period. Perioperative data such as demographic, medical, clinical, operative, and postoperative variables were collected and compared between patients 70 years old or younger (Group A, n = 1164) and patients above 70 years of age (Group B, n = 325). Statistical analysis was performed using the t-test for the continuous and the X(2) tests for the categorical variables. Significant variables according to the univariate analysis (X(2) and t-test) were further analyzed using multivariate logistic regression analysis. The variables of weight (P value < 0.001), preoperative PO2 (P valu...

Research paper thumbnail of Cu(CH3CN)4PF6 immobilized on halloysite as efficient heterogeneous catalyst for oxidation of allylic C–H bonds in olefins under mild reaction condition

Research on Chemical Intermediates, 2019

Considering the importance of oxidation of allylic C-H bonds in olefins and the unresolved challe... more Considering the importance of oxidation of allylic C-H bonds in olefins and the unresolved challenging issues, such as long reaction time and the large quantity of catalyst required, and encouraged by the excellent performance of halloysite as a catalyst support, a novel catalytic system was developed to promote this reaction efficiently. To prepare the catalyst, halloysite was first functionalized with ionic liquid then reacted with 2-aminopyrimidine to afford a potential support, Hal-P. The latter was then used for in situ immobilization of Cu(CH 3 CN) 4 PF 6 and applied to promote the reaction of cycloolefin and tert-butyl p-nitrobenzoperoxoate under mild reaction condition. The results showed that the nature of copper could play an important role in the catalytic activity. Moreover, the presence of ionic liquid and 2-aminopyrimidine in the structure could improve the activity of the final catalyst. Notably, low amounts of catalyst could catalyze the reaction to afford corresponding allylic esters in good yield. It was also found that the reaction was size selective and that cyclic olefins with lower strain could undergo this reaction more effectively. Study of the recyclability of the catalyst confirmed that it was recyclable and could be recovered and recycled for five consecutive reaction runs.

Research paper thumbnail of CCDC 1813680: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of The Synthesis of Allylic Esters via Direct Allylic C–H Bonds Oxidation of Cycloolefins in the Presence of Copper Oxide Nanoparticles and Nanoporous Silica

Nashrieh Shimi va Mohandesi Shimi Iran, Jan 21, 2020

Research paper thumbnail of CCDC 1813681: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Designing chiral amido-oxazolines as new chelating ligands devoted to direct Cu-catalyzed oxidation of allylic C H bonds in cyclic olefins

Tetrahedron, 2018

A new type of amido-oxazoline ligands was conveniently synthesized from inexpensive and commercia... more A new type of amido-oxazoline ligands was conveniently synthesized from inexpensive and commercially available materials in high yields and enantiomeric excesses. The corresponding chiral copper complexes with this class of ligands [C 2 symmetric S,S-bis(amido-oxazoline-Cu(II) complex] were synthesized accordingly. The ORTEP diagram of ligand 6a and complex 6a-copper were compared and characterization of the complex confirmed the involvement of both dentate parts of the ligands, the oxygen and nitrogen atoms, in complexation with copper. The utilization of this amido-oxazoline ligands in the copper-catalyzed enantioselective esterification of allylic CeH bonds of cyclic olefins with tertbutyl-4-nitrobenzoperoxoate resulted in the highest activities, yields (up to 95%) and enantioselectivities (up to 96%) in the presence of HZSM-5 zeolite. These new findings highlight the protocol as one of the most attractive and useful methods for the oxidation of the asymmetric allylic CeH bond of cycloalkenes compared to other methodologies reported in the literature.

Research paper thumbnail of Coronary arteries bypass grafting surgery in elderly patients

The journal of Tehran Heart Center, 2013

The incidence of coronary artery bypass grafting surgery (CABG) in elderly patients has been incr... more The incidence of coronary artery bypass grafting surgery (CABG) in elderly patients has been increasing. There are contradictory reports on the early outcome of elderly coronary artery patients as compared with their young counterparts. We designed this retrospective study to address this issue. We retrospectively analyzed the results of 1489 on-pump CABG cases performed at our hospital during a 4.5-year period. Perioperative data such as demographic, medical, clinical, operative, and postoperative variables were collected and compared between patients 70 years old or younger (Group A, n = 1164) and patients above 70 years of age (Group B, n = 325). Statistical analysis was performed using the t-test for the continuous and the X(2) tests for the categorical variables. Significant variables according to the univariate analysis (X(2) and t-test) were further analyzed using multivariate logistic regression analysis. The variables of weight (P value < 0.001), preoperative PO2 (P valu...

Research paper thumbnail of Cu(CH3CN)4PF6 immobilized on halloysite as efficient heterogeneous catalyst for oxidation of allylic C–H bonds in olefins under mild reaction condition

Research on Chemical Intermediates, 2019

Considering the importance of oxidation of allylic C-H bonds in olefins and the unresolved challe... more Considering the importance of oxidation of allylic C-H bonds in olefins and the unresolved challenging issues, such as long reaction time and the large quantity of catalyst required, and encouraged by the excellent performance of halloysite as a catalyst support, a novel catalytic system was developed to promote this reaction efficiently. To prepare the catalyst, halloysite was first functionalized with ionic liquid then reacted with 2-aminopyrimidine to afford a potential support, Hal-P. The latter was then used for in situ immobilization of Cu(CH 3 CN) 4 PF 6 and applied to promote the reaction of cycloolefin and tert-butyl p-nitrobenzoperoxoate under mild reaction condition. The results showed that the nature of copper could play an important role in the catalytic activity. Moreover, the presence of ionic liquid and 2-aminopyrimidine in the structure could improve the activity of the final catalyst. Notably, low amounts of catalyst could catalyze the reaction to afford corresponding allylic esters in good yield. It was also found that the reaction was size selective and that cyclic olefins with lower strain could undergo this reaction more effectively. Study of the recyclability of the catalyst confirmed that it was recyclable and could be recovered and recycled for five consecutive reaction runs.

Research paper thumbnail of CCDC 1813680: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.