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In this content, a stable, efficient, active, reusable and inexpensive magnetic boehmite was synthesized by hydrothermal sol-gel method. In the next step magnetic boehmite immobilized further with palladium chitosan complex (Fe 3 O 4 @BNPs-CPTMS-Chitosan-Pd (0)). This novel nanocatalyst was used for the oxidation of alcohols in ethanol and the preparation of 5-substituted tetrazoles in solvent-free conditions. To confirm the structure of catalyst, a variety of techniques, including FT-IR, XRD, FESEM, TEM, EDX, mapping, VSM, TGA-DTA, BET, ICP and UV-Visible were used. The mol % of catalyst was obtained with ICP (2.8 mol%). Also, some benefits of the catalyst are: excellent magnetic properties, easy separating from the reaction mixture with the external magnet, the use of cheap and affordable materials, good surface area (55.94 m 2 /g), low palladium leaching from the catalyst surface, use the green ligand and the use of catalyst for at least 5 consecutive times without reducing the catalytic activity.

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N -F o r m y l a t i o n o f A m i n e s w i t h T r i e t h y l O r t h o f o r m a t e i n W a t e rAbstract: A simple, efficient, scaleable process has been developed for the N-formylation amines in water. Treatment of amines with triethyl orthoformate in water at reflux under neutral conditions without any additives gives the corresponding N-formyl derivatives in good yields.

Reusable boehmite nanoparticles-silica-NHSO 3 H (BNPs-SiO 2 @(CH 2 ) 3 NHSO 3 H) was found to be an efficient heterogeneous nanocatalyst for the selective oxidation of sulfides to sulfones in the presence of H 2 O 2 . Excellent yields, easy and quick isolation of products, short reaction times and excellent selectivity are the main advantages of this method. The catalyst was characterized using Fourier transform infrared spectroscopy, energy-dispersive X-ray analysis, X-ray diffraction, and transmission and scanning electron microscopies.

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