OICC Press Journal of Nanostructure in Chemistry 2193-8865 8 2 (June 2018) 2018 06 28 Preparation and characterization of BF3 supported on coconut shell as a novel and effective nano-catalyst for one-pot synthesis of pyrano[2,3-d]pyrimidines 10.1007/s40097-018-0268-3 EN Hamidreza Molaei Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, IR Bahareh Sadeghi Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, IR Journal Article 2018 06 28 Abstract In this paper, boron trifluoride supported on coconut shell nano-particles (nano-BF 2 O-coc) was prepared from nano-crystalline coconut shell through mechanical method using ultrasonication. The resultant was utilized to obtain nano-crystalline BF 3 supported on coconut shell nano-particles (nano-BF 2 O-coc). The novel nanostructure has been characterized using Fourier transform infrared spectroscopy, transmission electron microscopy, field-emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDX) techniques. The catalytic activity of the solid acid catalyst has been successfully examined in a one-pot, three-component condensation reaction of barbituric acid, ethyl cyanoacetate or malononitrile, and aldehydes in refluxing ethanol to furnish pyrano[2,3- d ]pyrimidine derivatives. Graphical abstract