A series of novel α-(diphenylphosphoryl)and α-(diphenylphosphorothioyl)cycloalkanone oximes have been synthesized in search for novel bioactive molecules. Their structures were characterized by various spectroscopic methods including IR, NMR ( 1 H, 31 P, 13 C), mass spectrometry and single crystal X-ray diffraction. The newly synthesized phosphorus-containing oximes were screened for their in vitro antimicrobial activity against Gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis), Gramnegative bacteria (Escherichia coli and Salmonella typhimurium) and fungal strains (Candida albicans and Candida glabrata).The biological assays showed that all the studied compounds (2a-f) exhibited high antibacterial and antifungal activities at only 0.1-2.1 μg/mL. In silico molecular docking studies in FabH enzyme active site were performed in order to predict the possible interaction modes and binding energies of the drug candidates at the molecular level.

This research investigates an efficient dual valorization of olive mill wastewater in the biosynthesis of magnesium oxide nanoparticles and in the depollution of the effluent by Yarrowia lipolytica growth evaluation. After removal of polyphenols, the recovered biophenols were reacted with the magnesium precursor to provide magnesium oxide nanoparticles. In order to confirm the biosynthesized magnesium oxide nanoparticles, several analyses were undertaken. The Fourier transform infrared spectrum gives a broad absorption at 658 cm−1 confirming the presence of the magnesium oxide nanoparticles, while the UV/VIS absorption spectroscopy reveals an intense transition with a maximum absorption at 300 nm. The X‐ray diffraction and transmission electron microscopy analyses show that nanoparticles are in pure cubic crystalline with spherical and hexagonal shapes (average size is 19.4 nm). The zeta potential analysis illustrates a negative potential proving a good stability of the biosynthesized nanoparticles. Nanoparticles were assigned for their in vitro antibacterial activity against Escherichia coli, Enterobacter aerogenes, Salmonella typhimurium, Staphylococcus cohnii, and Bacillus niacini. The evaluation of the growth of Yarrowia lipolytica on the recovered olive mill wastewater after removal of polyphenols yielded 3.2 g/L of the Yarrowia biomass in 72 h without nutriment additions, providing an important decrease of chemical oxygen demand (73 %).

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A straightforward regio-and diastereoselective process has been developed for the synthesis of unprecedented symmetrical trans-,'-bis(diphenylphosphoryl)-and ,'-bis(diphenylphosphorothioyl)-cycloalkanones, through the reaction of cyclic enamines with excess P-chlorodiphenylphosphine in the presence of triethylamine, followed by oxidation or sulfurization and hydrolytic work-up.

1,3,5-tricyclohexyl-1,3,5-triazinane-2,4,6-trione (TCy-TAZTO) was obtained with high chemoselectivity and excellent yield, through an efficient and simple cyclotrimerization of isocyanatocyclohexane performed at room temperature and under mild reaction condition. The newly synthesized TCy-TAZTO was characterized with FT-IR, 1H and 13C NMR spectra. Single crystal X-ray diffraction was used to investigate its molecular structure. The Hirshfeld surface, curvedness, shape index and 2D-fingerprint plots were used to evaluate various intermolecular interactions within the crystal structure. DFT calculations, intrinsic reaction coordinate (IRC), Wiberg bond index and FOMs computational studies were performed to get more insights into the stability and the reaction mechanism. Furthermore, the molecular docking of the TCy-TAZTO was studied against different proteins to investigate the efficacy against selected drug targets of platelet aggregation, blood coagulation, antithrombotic and anti HIV-1disease.