|
Abstract
|
Herein, we introduce the first magnetic CuO nanoparticles based on carbon nanotubes as a highly
intriguing magnetic catalyst in Ullmann-type coupling of aryl halides with phenols. Two facile
procedures were used for the preparation of this magnetically separable catalytic system. Having been
treated with FeSO4 and then H2O2, nanotubes accommodated the resulting iron hydroxides on the
walls. The resulting nanocomposite was then exposed to argon atmosphere at 450 1C giving rise to a
carbon nanotube-supported a-Fe2O3 compound. Ultimately, copper acetate was hydrolysed in the
presence of CNT supported a-Fe2O3 at 100 1C and our novel catalyst was gained. Some spectroscopic
and microscopic techniques such as Infrared spectroscopy (IR), X-ray diffraction spectroscopy (XRD),
Vibrational sample magnetometry (VSM), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH),
Inductively coupled plasma (ICP), Scanning electron microscopy (SEM) and Transmission electron
microscopy (TEM) corroborated the structure of the catalyst. The catalyst synthesized showed good
activity in C–O cross coupling reactions affording the highest rate of completion. Magnetic feature of
the catalyst helped facile separation of it from the reaction medium. The catalyst could also be reused
up to six times without any loss of its activity.
|