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Nano-Zn[2-boromophenylsalicylaldiminemethylpyranopyrazole]Cl 2 (nano-[Zn-2BSMP]Cl 2 ) as a novel nanostructured Schiff base complex was prepared and characterized using several techniques. Nano-[Zn-2BSMP]Cl 2 was used as an effective catalyst for the preparation of some pyrano[2,3-d]pyrimidinedione derivatives by the multicomponent reaction of malononitrile, aryl aldehydes and barbituric acid derivatives. The novelty and efficiency of nano-[Zn-2BSMP]Cl 2 as a catalyst, in comparison with some other reported catalysts, for this synthetic transformation are the main features of this work.

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Oxidation O 0212 An Efficient and New Method on the Oxidative Coupling of Thiols under Mild and Heterogeneous Conditions. -The given protocol allows selective oxidative coupling of thiols under mild and heterogeneous conditions. Overoxidation is not observed. -(GHORBANI-CHOGHAMARANI*, A.; NIKOORAZM, M.; GOUDARZIAFSHAR, H.; TAHMASBI, B.; Bull. Korean Chem. Soc. 30 (2009) 6, 1388-1390; Dep. Chem., Fac. Sci., Ilam Univ., Ilam, Iran; Eng.) -H. Haber 45-034

By the condensation reaction of benzaldehyde with ethyl acetoacetate, malononitrile and hydrazine hydrate in the presence of FeCl 2 , a pyranopyrazole derivative was prepared which was then reacted with salicylaldehyde to affordCl 2 ). The prepared nano-Schiff base complex was fully characterized using Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, differential thermogravimetry, scanning electron microscopy and UV-visible spectroscopy, and was used as an efficient and catalyst for the preparation of pyranopyrazoles.