Piperazine‐functionalized nickel ferrite (NiFe2O4) nanoparticles were synthesized as recoverable heterogeneous base catalysts using a routine method. The synthesized materials were characterized using various spectroscopic techniques such as infrared, X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray, thermogravimetry analysis, and vibrating sample magnetometry. Catalytic efficiency was investigated in the synthesis of 2‐amino‐4H‐chromene derivatives via a one‐pot three component reaction of aldehyde and malononitrile with β or α‐naphthol/5‐methyle resorcinol under solvent‐free conditions with good to high yields. This method is operationally simple and has several advantages such as good to high yield, short reaction times, solvent‐free conditions, and easy synthesis. Moreover, the catalyst was recovered easily using an external magnet and reused three times without distinctive loss in catalytic activity.

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and Epoxides. -A simple and efficient one-pot reaction of epoxides (I), primary or secondary aliphatic amines (II) and carbon disulfide (III) under mild conditions (room temperature, solvent-free) provides access towards dithiocarbamates, e.g. (IV), in good yields. A single regioisomer is obtained for aliphatic (I) or alicyclic epoxides (V) while no significant regioselectivity is observed for styrene oxide (VII). -(AZIZI, N.; POURHASAN, B.; ARYANASAB, F.; SAIDI*, M. R.; Synlett 2007, 8, 1239-1242; Dep. Chem., Sharif Univ. Technol., Tehran, Iran; Eng.) -Mischke 38-057

An environmentally benign, highly efficient, and simple protocol for the synthesis of various structurally divergent dithiocarbamate derivatives in one-pot reaction of amines, carbon disulfide, and epoxides, without using any solvent and catalyst at room temperature, is presented. This new procedure has the advantages of higher yield, lower cost, reduced environmental impact, and simple work-up procedure.