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Timóteo, T.R.R., de Meloa, C.G., Danda, L.J.A., Silva, L.C.B.B., Fontes, D.A.F., Silva, P.C.D., Aguilera, C.S.B., Siqueira, L.P., Rolim, L.A. and Neto, P.J.R. (2019) Layered Double Hydroxides of CaAl: A Promising Drug Delivery System for Increased Dissolution Rate and Thermal Stability of Praziquantel. Applied Clay Science, 180, Article ID: 105197.
https://doi.org/10.1016/j.clay.2019.105197

has been cited by the following article:

• TITLE: Environmentally Friendly Room Temperature Synthesis of 1-Tetralone over Layered Double Hydroxide-Hosted Sulphonato-Salen-Nickel(II) Complex

  AUTHORS: Samiran Bhattacharjee, Mohammad A. Matin, Hasina Akhter Simol, Anowar Hosen

  KEYWORDS: Sulphonato-Salen-Nickel(II), Layered Double Hydroxide, Tetralin Oxidation, Room Temperature, 1-Tetralone

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.13 No.1, February 6, 2023

  ABSTRACT: 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 challenge with low-temperature processes using environmentally friendly routes even after decades of research. Herein, we demonstrate 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 by powder X-ray diffraction, Fourier transform infrared spectrometer (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 and molecular oxygen (14.5 psi) and at 25°C. At 45.5% conversion, tetralin was converted to 1-tetralone with 77.2% selectivity at room temperature and atmospheric pressure after 24 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.