LIST OF PUBLICATIONS 1-Mohamed Sharaf, Amr H. Moustafa, Rami J. Obaid, Abdullah Y.A. Alzahrani, Moustafa O. Aboelez, Hazem Elkady, Noof A. Alenazi, Mounir A.A. Mohamed, Jabir H. Al-Fahemi, Ziad Moussa, OMRAN A. OMRAN, Saleh A. Ahmed, Design, synthesis, molecular docking, ADMET studies, and biological activity evaluation of new 2-({[3-aryl-1,2,4-oxadiazol-5-yl)methyl]thio}-1H-benzimidazoles and 6-amino-6-aryl-5,6-dihydro[1,6,2,4]oxathiadiazocino[4,5-a]benzimidazol-3(2H)-ones, Journal of Molecular Structure, Volume 1295, 2, 2024,136708, 2-Aly ... إقراء المزيد

This work describes the fabrication and applications of potentiometric silver-selective sensors, based on the use of a newly synthesized p-tert-butylthiacalix[4]arene comprising two triazole rings, as a novel neutral ionophore in plasticized poly(vinyl chloride) (PVC) membranes. The effect of lipophilic anionic additives on the voltammetric responses of the sensors was investigated in details. The constructed sensors exhibited a Nernstian behavior with ... إقراء المزيد

In the title molecular salt, C8H20N+C42H48NO4S4, the conformation of the anionic tetrathiacalix[4]arene, which is cone-shaped, is primarily determined by intramolecular O—HO hydrogen bonds. There are also intramolecular C— HO short contacts present. In the crystal, the anions (A) and cations (C) are linked by C—HO and C—HS hydrogen bonds, forming –A–C–A–C– chains along [001]. The chains are linked via C—HNcyano ... إقراء المزيد

In the title molecular salt, C8H20N+C44H53O6S4, the conformation of the anionic tetrathiacalix[4]arene, which is cone-shaped, is primarily determined by intramolecular O—HO hydrogen bonds. There are also short intramolecular C— HO contacts present. The guest species do not sit within the bowl of the calixarene. One of the t-butyl groups in the anion is disordered over two sets of sites with ... إقراء المزيد

Phase transfer catalysis (PTC) technique for lower rim alkylation of p-tert-butylthiacalix[4]arene (TCA) with diethyl bromomalonate, phenacyl bromide, N,N-diethylchloroacetamide, ethyl bromoacetate and chloroacetonitrile using K2CO3, CsOH or Na2CO3 as a base and tetraethylammonium bromide (TEAB) as catalyst in benzene has been employed. Selective synthesis of monosubstituted p-tert-butylthiacalixarene using K2CO3 or CsOH as base has been elaborated. Unprecedented alkylation cyclization as well ... إقراء المزيد

In the title compound, C13H13N3O, the phenyl ring makes a dihedral angle of 47.0 (1) with the mean plane of the –NC( O)N– unit, while the dihedral angle between the latter mean plane and the aminophenyl ring is 84.43 (7). In the crystal, molecules are linked via N—HO hydrogen bonds involving the central –NHC( O)NH– units, forming chains running parallel ... إقراء المزيد

The asymmetric unit of the title compound, C54H64O12S4, consists of one half of the mol­ecule, which is located on an inversion centre. The heterocyclic six-membered ring adopts a distorted envelope conformation with the spiro C atom as the flap. In the crystal, mol­ecules are linked by weak C—H⋯O hydrogen bonds with an R22(14) motif, forming a chain along the b-axis ... إقراء المزيد

The asymmetric unit of the title compound, C48H54O5S4N(C2H5)4+Cl, contains two tetra-tert-butyl[(benzoyl)methoxy]-trihydroxy-tetrathiacalix[4]arene molecules, two tetraethylammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene ‘buckets’. In the crystal, extensive O—HO, O—HS and O—HCl ... إقراء المزيد

p-tert-Butylthiacalix[4]arene tetrathioesters 2a–c and tetrathioamides 4a–c in three different conformers (cone, partial cone and 1,3-alternate respectively) have been synthesized. The later were characterized by different physical methods IR, 1H NMR,13C NMR and X-ray crystallography. Their recognition abilities towards different alkali, earth alkaline and transition metals such as (Na?,K ?, Cs ?, Ba 2?, Pb 2?, Ag ?, Cd 2?, Hg ... إقراء المزيد

Di- and tetrasubstituted p-tert-butylthiacalix[4]arene in three different conformers (cone, partial cone and 1,3-alternate) at lower rim, have been synthesized by the reaction of p-tert-butylthiacalix[4]arene and disubstituted p-tert-butylthiacalix[4]arene with isatin-3-[N2-(chloroacetyl)]hydrazone in acetone or acetonitrile in the presence of different alkali metal carbonates or hydroxide. Structures of the new compounds were established by elemental analyses and spectral data IR, 1H NMR, 13C ... إقراء المزيد