%0 Journal Article
%T Environmentally Friendly Room Temperature Synthesis of 1-Tetralone over Layered Double Hydroxide-Hosted Sulphonato-Salen-Nickel(II) Complex
%A Samiran Bhattacharjee
%A Mohammad A. Matin
%A Hasina Akhter Simol
%A Anowar Hosen
%J Green and Sustainable Chemistry
%P 9-22
%@ 2160-696X
%D 2023
%I Scientific Research Publishing
%R 10.4236/gsc.2023.131002
%X 1-Tetralone, a useful synthetic intermediate in the
manufacture of pharmaceuticals, agrochemicals and dyes, can be prepared by
liquid phase catalytic oxidation of tetralin. Selective oxidation of tetralin
to 1-tetralone is still a big <span>challenge with
low-temperature processes using environmentally friendly</span><span> route</span><span><span style=\"font-family:;\" \"=\"\">s</span></span><span><span style=\"font-family:;\" \"=\"\"> even after decades of research. Herein, we
demonstrate</span></span><span><span style=\"font-family:;\" \"=\"\"> room-temperature oxidation of tetralin to 1-tetralone over layered double
hydroxide-hosted sulphonato-salen-nickel(II) complex, LDH-[Ni-salen]. The
layered double hydroxide-hosted sulphonato-salen-nickel(II) compound was
characterized <span>by powder X-ray diffraction,
Fourier transform infrared spectrometer</span> (FTIR), UV-Visible diffuse
reflectance spectra, scanning electron microscopy (SEM) and elemental analysis.
The theoretical calculations of free sulphonato-salen-nickel(II) complex using
Density Functional Theory/CAM-B3LYP at the 6-311++ G(d,p) level of theory were
also used to determine the orientation of the Ni-salen compound within the
layered structure. The immobilized compound, LDH-[Ni-salen] was found to be an
effective reusable catalyst for the oxidation of tetralin to 1-tetralone using
a combination of trimethylacetaldehyde<span style=\"color:red;\"> </span>and molecular
oxygen (14.5 psi) and at 25</span></span><span><span style=\"font-family:;\" \"=\"\">&amp;deg;C</span></span><span><span style=\"font-family:;\" \"=\"\">. At 45.5%
conversion, tetralin was converted to 1-tetralone with 77.2% selectivity at
room temperature and atmospheric pressure after 24</span></span><span><span style=\"font-family:;\" \"=\"\"> h. The catalyst recycles test and hot filtration
experiment showed that oxidation proceeded through Ni(II) sites in
LDH-[Ni-salen]. The catalysts were reused several times without losing their
catalytic activity and selectivity. The present results may provide a
convenient strategy for the preparation of 1-tetralone using layered double
hydroxide-based heterogeneous catalyst at ambient temperature for industrial
application in near future.</span></span>
%K Sulphonato-Salen-Nickel(II)
%K Layered Double Hydroxide
%K Tetralin Oxidation
%K Room Temperature
%K 1-Tetralone
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=122855