Papers by Prof. Mohammad G. Dekamin
RSC Advances, Dec 31, 2022
RSC Advances, Dec 31, 2022
A cost-effective and convenient method for supporting of Cu(II) nanoparticles on a modified chito... more A cost-effective and convenient method for supporting of Cu(II) nanoparticles on a modified chitosan backbone containing urea and thiourea bridges using thiosemicarbazide (TS), pyromellitic dianhydride (PMDA) and toluene-2,4-diisocyanate (TDI) linkers was designed. The prepared supramolecular (CS-TDI-PMDA-TS-Cu(II)) nanocomposite was characterized by using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), thermogravimetry/differential thermogravimetry analysis (TGA/DTA), energy-dispersive X-ray spectroscopy (EDS), EDS elemental mapping and X-ray diffraction (XRD). The obtained supramolecular CS-TDI-PMDA-TS-Cu(II) nanomaterial was demonstrated to act as a multifunctional nanocatalyst for promoting of multicomponent cascade Knoevenagel condensation/click 1,3-dipolar azide-nitrile cycloaddition reactions very efficiently between aromatic aldehydes, sodium azide and malononitrile under solventfree conditions and affording the corresponding (E)-2-(1H-tetrazole-5-yl)-3-arylacrylenenitrile derivatives. Low catalyst loading, working under solvent-free conditions and short reaction time as well as easy preparation and recycling, and reuse of the catalyst for five consecutive cycles without considerable decrease in its catalytic efficiency make it a suitable candidate for the catalytic reactions promoted by Cu species.
Scientific Reports, Feb 16, 2023
In this research, a new magnetic decorated hyperbranched chitosan by grafting of 5-sulfosalicylic... more In this research, a new magnetic decorated hyperbranched chitosan by grafting of 5-sulfosalicylic acid using toluene-2,4-diisocyanate linker (CS-TDI-SSA-Fe3O4) was designed and prepared conveniently. The obtained magnetic biopolymeric nanomaterial was properly characterized by using FT-IR, EDX XRD, FESEM, TGA and VSM spectroscopic, microscopic, or analytical methods. The supramolecular CS-TDI-SSA-Fe3O4 nanocomposite was investigated, as a heterogeneous solid acidic organocatalyst, to promote three-component synthesis of 2,3-dihydroquinazoline-4(1H)-one derivatives under green chemistry conditions. The CS-TDI-SSA-Fe3O4 nanocatalyst was demonstraed to act as a highly efficient solid acid for the synthesis of various quinazoline derivatives, as an important pharmaceutical scaffold, through multicomponent strategy. The reaction proceeds very well in the presence of CS-TDI-SSA-Fe3O4 solid acid nanocatalyst in EtOH to afford corresponding 2,3-dihydroquinazoline-4(1H)-one derivatives in hi...
A novel and recyclable catalytic system was prepared by linking polyethyleneimine (PEI) to tannic... more A novel and recyclable catalytic system was prepared by linking polyethyleneimine (PEI) to tannic acid (TA) using 1,3-dibromopropane, as a cross-linker, to afford (TA-PEI) composite during a convenient and inexpensive procedure. Moreover, to increase the efficacy of the catalyst and to reduce the reaction time, magnetization and sulfonation of the prepared nano-catalyst have been properly performed to afford the final TA/PEI/magnetic/sulfonated (TPMS) supramolecular heterogeneous nonmagnetic composite. The TPMS catalytic system was characterized by various spectrometric and analytical techniques including Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). Furthermore, the heterogeneous TPMS nanocomposite catalytic sytem demonstrated excellent catalytic activity for the one-pot synthesis of...
Journal of Biomolecular Structure and Dynamics
SSRN Electronic Journal, 2021
Journal of the Iranian Chemical Society, 2021
Abstract A heterogeneous organic–inorganic hybrid durable nanocatalyst γ-Al 2 O 3 @Silane-TMG was... more Abstract A heterogeneous organic–inorganic hybrid durable nanocatalyst γ-Al 2 O 3 @Silane-TMG was prepared by covalently functionalization of nano-γ-Al 2 O 3 through anchored 3-chloropropyl- trimethoxysilane with 1,1,3,3-tetramethylguanidine (TMG). The structure of the catalyst was characterized by various techniques including FT-IR, XRD, SEM, EDX and TGA analyses. The synthesized nanocatalyst was successfully used in an efficient and green four-component synthesis of pyrazolopyranopyrimidine derivatives using ethyl acetoacetate, hydrazine hydrate, arylaldehydes and barbituric acid (or thiobarbituric acid) in H 2 O at 40 ºC. This practical method produced the desired products at reduced reaction times (10–25 min) and high to excellent yields (85–98%). The main advantages of this practical method are the use of heterogeneous basic nanocatalyst, simple work-up procedure with no need to chromatographic purification, affording highly selective conversion and recyclability of the catalyst which could be used in 5 cycles with only a small decrease in its activity. Graphic abstract
Proceedings of The 15th International Electronic Conference on Synthetic Organic Chemistry, 2011
Proceedings of The 13th International Electronic Conference on Synthetic Organic Chemistry, 2009
Applied Organometallic Chemistry, 2019
Zinc oxide‐decorated superparamagnetic silica attached to graphene oxide (Fe3O4/SiO2/PTS‐GO‐ZnO),... more Zinc oxide‐decorated superparamagnetic silica attached to graphene oxide (Fe3O4/SiO2/PTS‐GO‐ZnO), as a novel nanocomposite, was designed, and its core‐shell structure was appropriately characterized by different spectroscopy or microscopy methods and thermal techniques as well as measuring of its porosity and magnetic properties. The catalytic activity of Fe3O4/SiO2/PTS‐GO‐ZnO, as a reusable heterogeneous catalyst, was investigated for efficient one‐pot multi‐component synthesis of medicinally important functionalized 2‐amino‐6‐(2‐oxo‐2H‐chromen‐3‐yl)‐4‐arylnicotinonitrile derivatives. The significant features of the present procedure are mild reaction conditions, low loading of the catalyst, high to quantitative yields of the desired products, avoiding the use of toxic heavy metals or solvents, simple isolation and purification of the products, and stability as well as reusability of the catalyst after at least six consecutive runs.
International Journal of Biological Macromolecules, 2016
The synergic effect of the chitosan biomacromolecule support for catalyzing of Hantzsch esters fo... more The synergic effect of the chitosan biomacromolecule support for catalyzing of Hantzsch esters formation by CuSO4 has been demonstrated for one-pot and efficient pseudo-four-component reaction to afford a wide range of 1,4-dihydropyridine (DHP) or polyhydroquinoline (PHQ) derivatives. The desired products were simply prepared from different aldehydes, β-dicarbonyls and ammonium acetate in the presence of a low loading of chitosan supported copper(II) sulfate (CSCS) in EtOH under reflux conditions. The biodegradable CSCS catalyst was characterized by field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy analysis (EDX) methods as well as coupled plasma-atomic emission (ICP-AE) and FT-IR spectroscopy. The CSCS catalyst is recyclable and reused four times without significant loss of its activity.
International Journal of Biological Macromolecules, 2016
Journal of the Iranian Chemical Society, 2015
Dihydropyrano[2,3-c]pyrazole annulated heterocyclic compounds with diverse substituents on the 4H... more Dihydropyrano[2,3-c]pyrazole annulated heterocyclic compounds with diverse substituents on the 4H-pyran ring were efficiently prepared via a one-pot and four-component reaction of ethyl acetoacetate, hydrazine hydrate, aromatic aldehyde, and malononitrile. The procedure proceeds without utilization of any catalyst or solvent using ball milling technique at ambient temperature to afford desired medicinally important dihydropyrano[2,3-c]pyrazole derivatives. This protocol offers several advantages such as avoiding the use of any toxic and hazardous catalyst or solvent, mild reaction conditions, high to quantitative yields of products, low cost, and straightforward work-up.
Journal of Cleaner Production, 2015
ABSTRACT The aim of this study was to assess the life cycle of rainbow trout under three culturin... more ABSTRACT The aim of this study was to assess the life cycle of rainbow trout under three culturing systems including flow-through, recirculating and semi-closed recirculating systems in Iran. The life cycle assessment (LCA) method was found to be suited very well for this purpose. LCA method was used to quantify and compare the potential environmental impacts of culturing rainbow trout in the above three aquaculture systems. Differences were found between the above three systems in terms of water dependence, land competition, feed production processes and energy use. Feed production was found to be the major contributor to the potential impacts such as climate change and acidification in all of the above three systems due to variable feed conversion ratios (FCR, 1.15, 1.47 and 1.57) in flow-through, recirculating and semi-closed recirculating systems, respectively. The obtained results indicate that the semi-closed recirculating system was less efficient than the flow-through system, with a higher level of potential eutrophication (49% greater), abiotic depletion (80% greater) and global warming (82% greater). The recirculating system required about 10 time more material and energy demands compared to the flowthrough system. Water dependence in the flow-through system was calculated to be 27 and 3.7 times more than for the recirculating and semi-closed recirculating systems, respectively for the same quantity of biomass production. The major contribution to the land use was feed ingredient production (up to 95%) for the semi-closed recirculating and recirculatingsystem. On the other hand, the land use in the flowthrough system on farm rainbow trout production andfeed ingredient production were calculated about 11 and 89%, respectively. Therefore, many options exist for improving the environmental performance of these aquaculture systems. The most important measure is to increase the feed and energy efficiency through improvements in rearing modes and the optimisation of feeding practices. It is recommended that excluded impacts such as biodiversity and socio-economic impacts be carefully considered in further sustainability assessments of recirculating and semi-closed recirculating systems and in continuing efforts to improve and develop these technologies on a larger scale.
Tetrahedron, 2013
ABSTRACT Export Date: 31 January 2013, Source: Scopus
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Papers by Prof. Mohammad G. Dekamin