Autor: Gharib, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Flammable mixture formation and mixing rates of transient gaseous fuel jet with air in tumbling or swirling motion
Autorzy:: Gharib, N.,
Sobiesiak, A.
Powiązania:: https://bibliotekanauki.pl/articles/248093.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mixing
axial swirl
barrel swirl (tumble)
numerical modelling
KIVA
Opis:: In this study the effects of angular momentum (barrel and axial swirl) on flammable mixture formation and mixing rate between chamber air and transient gaseous jets of hydrogen and methane were numerically investigated in several geometric configurations; in fixed volume cubic and cylindrical chambers, and in a variable volume cylindrical chamber with moving piston. The magnitude of the momentum, injection duration, and injection velocity are the main parameters whose effects were investigated. In the cylindrical chamber with mowing piston dissipation of a bulk air motion vortex, and the angular momentum decay during compression were also studied The numerical simulations were carried out with the use of KIVA3V code modified for gaseous injection with a standard k-e model for turbulence. It was found that hydrogen jet and air mixing under application of angular momentum lead to fast formation of flammable mixture, with the mixing rates several times larger than those for methane jet. Also dynamics of the hydrogen mixing as illustrated by the mixing rate curves is markedly different from those for methane with the same magnitude of angular momentum. The mixing rate curves for hydrogen feature one strong local maximum at time which is half or less of the hydrogen jet injection duration time. Mixing of methane jet with air at all conditions resembles that of hydrogen jet mixing with air at zero or lower levels of angular momentum.
Źródło:: Journal of KONES; 2008, 15, 3; 147-153
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Phytoplankton and environmental variables as a water quality indicator for the beaches at Matrouh, South-Eastern Mediterranean Sea, Egypt: an assessment
Autorzy:: Gharib, S.M.
El-Sherif, Z.M.
Abdel-Halim, A.M.
Radwan, A.A.
Powiązania:: https://bibliotekanauki.pl/articles/48802.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: abiotic environment
beach
biotic environment
community structure
diversity index
Egypt
environment variability
hydrochemical change
hydrographic change
marine environment
Matrouh beach
Mediterranean Sea
nutrient concentration
phytoplankton
water quality
Opis:: This study was carried out to determine the water quality of the beaches at Matrouh, south-eastern Mediterranean Sea, Egypt, by studying environmental variables as well as phytoplankton abundance and community structure. Surface water samples were monitored from a series of beach sites over a period of five seasons during 2009–2010. A total of 203 phytoplankton species were identified from seven algal divisions. Seasonal differences in the quantitative and qualitative composition of the phytoplankton communities in the different sites were marked. Nutrient concentrations and phytoplankton abundances were found to be poorer than those of many other areas along Egyptian coast. The Shannon-Wiener Diversity Index classified Matrouh water as being between clean and moderately polluted, whereas the WQI demonstrated that it was between good and excellent. It can be concluded that the index based onWQI is currently more suitable than the phytoplankton species index for assessing the quality of the water of the Matrouh beaches.
Źródło:: Oceanologia; 2011, 53, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki