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بیست و نهمین کنفرانس شیمی آلی ایران
A lanthanum complex on modified magnetic graphene oxide nanosheets with 1,3-bis(pyridin-3-ylmethyl)thiourea as a as an efficient and reusable nanocatalyst in the synthesis of pyranopyrazole and tetrahydrobenzo[b]pyran derivatives
نویسندگان :
Bahman Tahmasbi ( دانشگاه ایلام ) , Parisa Moradi ( دانشگاه ایلام ) , Mitra Darabi ( دانشگاه ایلام )
کلید واژه ها :
Graphene oxide،pyranopyrazole،tetrahydrobenzo[b]pyran،magnetic nanoparticles،lanthanum
چکیده مقاله :
In this work, Graphene oxide (GO) was synthesized and further it was magnetized using nickel magnetic nanoparticles (GO-Ni MNPs). The surface of GO-Ni MNPs was modified by (3-chloropropyl) trimethoxysilane (CPTMS). Then, 1,3-bis(pyridin-3-ylmethyl)thiourea (bisPTU) was immobilized on its surface. Next, lanthanum was stabilized on the surface of modified magnetic graphene oxide nanosheets (La-bisPTU@GO-Ni MNPs) as an efficient and reusable nanocatalyst in the synthesis of pyranopyrazole and tetrahydrobenzo[b]pyran derivatives. La-bisPTU@GO-Ni MNPs has been characterized by SEM, EDS, WDX, ICP, TGA, FT-IR, BET and VSM techniques. This catalyst was recovered using an external magnet and reused for several times (Scheme).
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