Vitamin B 6-Pd(II) immobilized onto magnetic nanoparticles have been successfully prepared and applied for C-Xcross-coupling reactions with aryl halides in green deep eutectic solvents. The results prove that the Fe 3 O 4 @vitamin B 6-Pd(II) magnetic nanoparticles show high catalyst activity and good stability. It was also revealed that this complex can be recycled up to five times without any significant loss in catalytic activity.
Hydrazonoyl chlorides react with β‐nitrostyrenes in ethanol under the clean action of ultrasonic irradiation. The reaction proceeds at room temperature via 1,3‐dipolar cycloadditions of in situ generated nitrile imine with β‐nitrostyrenes with concurrent elimination of HCl and HNO2 to afford 1,3,4‐trisubstituted pyrazoles with good to high yields and excellent regioselectivity in a short time.
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