An efficient and product selective reduction of azoxyarenes into azoarenes or hydrazoarenes bytin/hydrazine hydrate

1086-1089A general and rapid method is described for the reduction of azoxyarenes to give the corresponding hydrazoarenes under microwave irradiation and azoarenes at reflux conditions on treatment with hydrazine hydrate in the presence of tin metal in methanol. The reactions are found to be fast and clean, give excellent yield and high purity of the products. Ether linkage and Cl are unaffected

A fast and benign synthesis of α-aminonitriles by reusable immobilized AlCl₃ on γ-Al₂O₃

110-116Reusable, immobilized AlCl3 on γ-Al2O3 is generated by the reaction of AlCl3 on activated γ-Al2O3 of 58 Å at 600°C. This is an efficient, catalytic, safe and environmentally acceptable catalyst for the synthesis of a series of α-aminonitriles utilizing Strecker’s process by the reaction of carbonyl compounds, amines and trimethylsilyl cyanide (TMSCN) with excellent yields at ambient temperature. The catalyst can be easily recycled and has been reused for thirteen runs without losing its activity

Novel synthesis of 1,5-disubstituted-1,2,3-triazolines catalysed by Zepto™ magnetic microspheres under the influence of rotating magnetic field

The novel reactor has been designed to perform chemical reactions under the influence of magnetic field generated by alternating magnetic poles as a function of time and successfully employed the system to synthesize a series of 1,5-disubstituted-1,2,3-triazolines via the regioselective [3+2] cycloaddition reactions between alkyl/aryl azides and nitro-olefins catalysed by Zepto™ (para magnetic ultra-blue carboxy functionalized) microspheres (bead diameter 2.5 μm). All the reactions went smoothly without any adverse effect on nitro, cyano, thienyl, hydroxy, halogens and ether functions at 25±2°C, to afford 82-99% pure products at magnetic field and exposure time of 18.99 mT and 180-240 min. The influence of magnetic force exerted on the magnetic materials was found to enhance the catalytic activity of microspheres. The catalyst could easily be separated by simple centrifugation which could be reused for at least 15 runs with no loss in activity.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author