An efficient and environmentally adapted synthesis of 2-amino-3-phenylsulfonyl-4-aryl-4H-benzo[h]chromenderivatives by condensation of a wide range of aryl aldehydes, α-naphthol and (phenylsulfonyl)acetonitrile using a catalytic amount of nano-ZnOunder solvent-free condition is explained. This catalyst was characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR),X-ray diffraction spectroscopy (EDX)and Thermogravimetric analysis (TG).As aresult, 2-amino-3-phenylsulfonyl-4-aryl-4H-benzo[h]chromens were produced under facile conditions in high yield (89-96%) and high rate (8-15 min) using nano-ZnO as a recyclable catalyst. تفاصيل المقالة

The reaction of nano-cellulose and antimony pentachloridein dichloromethane gave nano-cellulose-SbCl5. Also nano-cellulose-SbCl5 has beencharacterized by energy dispersive X-ray spectroscopy(EDX), scanning electron microscopy (SEM)and Fourier transform infrared spectroscopy(FTIR).Nano-cellulose-SbCl5has been applied as a nano-catalyst for synthesis of pyrano[2,3-d]pyrimidines from the simple one-pot reaction between aryl aldehydes,barbituric acid orthiobarbituric acid and malononitril.Cleanliness, simple methodology, short time, and excellentyields of products are some advantages of this method. تفاصيل المقالة

Nano-rice bran/TiCl4has been prepared from rice bran and TiCl4 in n-hexane as solvent. Thennanoricebran/TiCl4 has been introduced as a novel catalystfor the three component synthesis of pyrano[3,2-b] pyransfrom the simple one-pot reactionbetweenaryl aldehydes,cyanoacetamide and kojicacid.Cleanliness, an eco-friendly catalyst, simple methodology, short time, and excellent yields ofproducts are some advantages of this method. تفاصيل المقالة

Microwave assisted reactions have gained considerable attention, due to versatility and reduction ofsolvent and reaction time. The reaction of a nano-coconut shell and boron tri-fluoride in diethylether solvent resulted in preparation of nano-coconut shell-BF3 as a catalyst. The nano-coconutshell-BF3 catalyst has been characterized by fourier transform infrared spectroscopy (FT-IR), fieldemission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM).Nano-coconut shell-BF3 has been applied as a new heterogeneous catalyst for synthesis of 4Hchromenederivatives from the simple one-pot reaction between aryl aldehydes, cyclic 1,3-diketoneand, malononitrile under microwave reaction. Cleanliness, simple methodology, short time, andexcellent yields of products are some advantages of this method. تفاصيل المقالة