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Wyszukujesz frazę "Jahangir, M." wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
Acylation of aromatic compounds by acid anhydrides using Preysslers anion [NaP5W30O110]14- and heteropolyacids as green catalysts
Autorzy:
Gharib, A.
Jahangir, M.
Scheeren, J.(H.)W.
Powiązania:
https://bibliotekanauki.pl/articles/779170.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
acylowanie
bezwodniki
heteropolikwasy
katalizator
związki aromatyczne
acylation
Preyssler
anhydride
heteropoly acids
catalyst
aromatic compounds
Opis:
The Preyssler, Wells-Dowson and Keggin heteropolyacids are efficient and eco-friendly solid acid catalysts for the acylation of electron-rich aromatic compounds with acid anhydrides. The performance of different forms of heteropolyacids was compared. In all the cases, the best results were obtained using the Preyssler heteropolyacid as the catalyst. In the presence of 25 mol% (with respect to H+ equivalency) Preyssler catalyst, highly para-selective acetylation of anisole occurs using two equivalents of acetic anhydride, in 15 min at room temperature. The isolated yield of the p-methoxyacetophenone product is 98%.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 2; 11-17
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel catalytic method synthesis of calix[4]pyrroles using Preyssler and Wells-Dawson heteropolyacids
Autorzy:
Gharib, A.
Jahangir, M.
Scheeren, J.(H.)W.
Powiązania:
https://bibliotekanauki.pl/articles/779286.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
kaliks[4]pirole
heteropolikwasy
kataliza
calix[4]pyrrole
heteropoly acid
Preyssler
Wells-Dawson
catalysis
N-confused calix[4]pyrrole
Opis:
A catalytic synthesis of calix[4]pyrroles and N-confused calix[4]pyrroles by reaction of dialkyl or cycloalkyl ketones with pyrrole was performed using Preyssler, sodium30-tungsto pentaphosphate, [NaP5W30O110]14- and Wells-Dawson heteropolyacids as acidic catalysts. The process occurred under mild, eco-friendly and environmental friendly conditions and as a reusable, green catalyst at room temperature for 6 hours. The results showed that the yield for this synthesis is excellent with the use of Preyssler and Wells-Dawson type tungstophosphoric heteropolyacid, H6[P2W18O62], catalysts. The synthesis reaction of calix[4]pyrroles and N-confused calix[4]pyrroles was developed using different solvents and the best yields were obtained in chloroform.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 2; 70-73
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acetylation of p-aminophenol by Preysslers anion [NaP5W30O110]14-, [NaP5 W29MoO110]14- with green condition at room temperature
Autorzy:
Gharib, A.
Scheeren, J.(H.)W.
Bamoharram, F.F.
Roshani, M.
Jahangir, M.
Powiązania:
https://bibliotekanauki.pl/articles/779176.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heteropolikwasy
p-aminofenol
acetaminofen
katalizator
heteropoly acid
Preyssler
p-aminophenol
acetaminophen
green catalyst
Opis:
Synthesis of acetaminophen at green condition and room temperature in the presence of the Preyssler type heteropolyacids has been investigated in order to contribute toward clean technology, which is the most important need of the society. All of the catalysts are recyclable and reusable.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 2; 31-35
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel catalytic synthesis of 6,7-dimethoxyisatin with the use of heteropolyacids (HPAs) as acid solid catalyst
Autorzy:
Gharib, A.
Daneshtalab, M.
Scheeren, J.(H.)W.
Bamoharram, F.F.
Roshani, M.
Jahangir, M.
Powiązania:
https://bibliotekanauki.pl/articles/778715.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heteropolikwasy
katalizator
izatyna
heteropoly acid
catalyst
Preyssler
isatin
mandelonitrile
Opis:
An efficient method for the preparation of 6,7-dimethoxyisatin and its derivatives was developed with good yield by using Preyssler-type heteropolyacid (HPA) as acid catalyst under green conditions. The comparison between Keggin type heteropolyacids, H3[PW12O40], H4[SiW12O40] and H4[SiMo12O40], H3[PMo12O40] and mineral acids with Preyssler's anion shows that the latter possess better catalytical activity than the other heteropolyacids and no degradation of the structure was observed.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 3; 5-7
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One-pot synthesis of (S)-2-(6-methoxynaphtalen-2-yl)propanoic acid, (S)-Naproxen using Preyssler and Keggin-type heteropolyacids as green and reusable catalysts
Autorzy:
Gharib, A.
Daneshtalab, M.
Scheeren, J.(H.)W.
Bamoharram, F.F.
Roshani, M.
Jahangir, M.
Powiązania:
https://bibliotekanauki.pl/articles/778717.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
katalizator
heteropolikwasy
D-mannitol
(S)-naproxen
Preyssler
catalyst
heteropoly acid
(S)-Naproxen
Opis:
A simple, clean and environmentally benign route to the enantioselective synthesis of (S)-2-(6-methoxynaphtalen-2-yl)propanoic acid, (S)-Naproxen 3 is described by using Preyssler heteropolyacid, H14[NaP5W30O110], as a green and reusable catalyst in water and in the presence of 1-(6-methoxynaphthalen-2-yl)propan-1-one 1, D-mannitol 2. The products were obtained in very good yields.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 3; 8-14
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalytic synthesis of warfarin acetals by using different heteropolyacid catalysts
Autorzy:
Gharib, A.
Jahangir, M.
Roshani, M.
Scheeren, J. W.
Mohadeszadeh, S.
Bakhtiari, L.
Lagzian, S.
Powiązania:
https://bibliotekanauki.pl/articles/778836.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heteropolikwas
katalizator
warfaryna
acetale cykliczne
heteropoly acid
Preyssler
catalyst
Warfarin
cyclic acetals
Opis:
In this research, we report on the synthesis of warfarin acetals by using Preyssler's anion, [NaP5W30O110]-14 and heteropolyacids (HPAs) catalysts. This reaction was performed using methanol and ethanol at reflux temperature conditions. Under these conditions we have excellent yields and high selectivity. Preyssler heteropolyacid catalyst were easily recycled recovery and reused without the loss of its catalytic activities. The synthesis of warfarin acetals has been achieved using the catalytic amounts of green, inexpensive and eco-friendly Keggin types heteropolyacids. The products were obtained in high yields.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 3; 5-11
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of variable fluid properties and mixed convection on biomagnetic fluid flow and heat transfer over a stretching sheet in the presence of magnetic dipole
Autorzy:
Murtaza, M. G.
Alam, Jahangir
Tzirtzilakis, E. E.
Shamshuddin, Md.
Ferdows, M.
Powiązania:
https://bibliotekanauki.pl/articles/41191498.pdf
Data publikacji:
2023
Wydawca:
Politechnika Warszawska, Instytut Techniki Cieplnej
Tematy:
stretching sheet
biomagnetic fluid
magnetohydrodynamic
ferrohydrodynamic
magnetic dipole
magnetization
variable viscosity
thermal conductivity
rozciąganie arkusza
płyn biomagnetyczny
magnetohydrodynamika
ferrohydrodynamika
dipol magnetyczny
namagnesowanie
zmienna lepkość
przewodność cieplna
Opis:
This investigations covers the numerical analysis of a steady biomagnetic fluid flow (BFD) that passed through a two dimensional stretching sheet under the influence of magnetic dipole. The effect of fluid variable viscosity and thermal conductivity are also taken into consideration as assumed to vary as linear function of temperature. Our model mathematically formulated for BFD namely blood which consist of principles of magnetohydrodynamic (MHD) and ferrohydrodynamic (FHD), where blood treated as an electrically conducting fluid as well as polarization. Using similarity transformations, the governing system of partial differential equations are transferred into system of ordinary differential equations (ODE). The resulting coupled non linear ODE is numerically solved by employing bvp4c function technique available in MATLAB software. The effects of pertinent parameters namely ferromagnetic interaction parameter, magnetic field parameter, mixed convection parameter, viscosity variation parameter, Prandtl number, thermal conductivity parameter etc are plotted and discussed adequately for velocity and temperature profile as well as skin friction coefficient and rate of heat transfer. The results revels that velocity profile decreases as enhanced values of ferromagnetic number whereas temperature profile increased. Also found that skin friction coefficient reduces and rate of heat transfer increases by increasing values of thermal conductivity parameter and viscosity variation parameter. For numerical validation a comparisons has been made for some specific values with previous investigators. We hope that the present analysis will present in bio-medical and bio-engineering sciences.
Źródło:
Journal of Power Technologies; 2023, 103, 4; 193-208
1425-1353
Pojawia się w:
Journal of Power Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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