Semra Celebi

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Biginelli reaction which involves condensation of methyl 3-oxopentanoate, aromatic aldehydes and thiourea with a catalytic amount of HCl at reflux temperature has been used for the synthesis of 4-aryl-6-ethyl-5-(methoxycarbonyl)-3,4-dihydropyrimidin-2(1H)-thiones (1-16). In addition, Lewis acids such as FeCl(3).6H(2)O and/or H(3)BO(3) were also used as(More)
Zeolites are crystalline, hydrated aluminosilicates of alkali (i.e. Na+, K+) and alkaline-earth cations (i.e. Mg2+, Ca2+) having infinite three-dimensional structures. Their ability to gain and lose water induces structural major changes. The Ca2+ cations are exchangeable with other cations such as NH4+, Mg2+, Na+ and K+ [19]. The wide ranges of Zeolite(More)
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