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Mahdavinia G.H.,Islamic Azad University at Marvdasht | Amani A.M.,K. N. Toosi University of Technology | Sepehrian H.,Jaber Ibn Hayan Research Laboratories
Chinese Journal of Chemistry | Year: 2012

Nanosized MCM-41-SO 3H based on ordered mesoporous silica material with a covalent sulfonic acid group was synthesized and used as acid catalyst for the new, simple, convenient and green synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetra-substituted imidazoles. Also some of synthesis products are new. Echo-friendly protocol, short reaction times, easy and quick isolation of the products and excellent yields are the main advantages of this procedure. © 2012 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Mahdavinia G.H.,Islamic Azad University at Marvdasht | Rostamizadeh S.,K. N. Toosi University of Technology | Amani A.M.,K. N. Toosi University of Technology | Sepehrian H.,Jaber Ibn Hayan Research Laboratories
Heterocyclic Communications | Year: 2012

Nanosized MCM-41-SO 3H material based on ordered mesoporous silica gel with covalently attached sulfonic acid groups was synthesized and used as acid catalyst for green synthesis of 2-substituted benzimidazole derivatives. Echofriendly protocol, short reaction times, easy and quick isolation of the products, and excellent yields are the main advantages of this procedure. Copyright © by Walter de Gruyter.


Mahani M.K.,Jaber Ibn Hayan Research Laboratories | Maragheh M.G.,Jaber Ibn Hayan Research Laboratories
Food Analytical Methods | Year: 2011

Standard addition method was applied for neutron activation analysis of tea leaves. Four brands of tea leaves were analyzed for its Na, K, Mn, and Br contents by this method. The Na, K, Mn, and Br concentrations were found to be in the 90-120 μg/g, 1.8-2.1% w/w, 150-500 and 3-7 μg/g ranges, respectively. The extraction efficiency of these elements, during the infusion, was calculated by analysis of tea leaves before and after the infusion process. It was observed that about 90% of the Na, K, and Br elements were extracted to water during the infusion process. The drinking tea is a rich source of Mn (despite of an extraction efficiency of 50% for this element). © 2009 Springer Science+Business Media, LLC.

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