Ahmet Tutar

5-Amino-4-bromo-2,3-dihydro-1H-inden-1-one

In the title compound, C9H8BrNO, the non-H-atom framework is essentially planar, with a maximum deviation of 0.087 (3) Å. In the crystal, molecules are interconnected into a three-dimensional network by C—H⋯O and N—H⋯O hydrogen bonds. In addition, C—H⋯π interactions and a π–π stacking interaction, with a centroid–centroid distance of 3.5535 (19) Å, are also observed.

2,4-Dibromo-2,3-dihydro-1H-inden-1-yl acetate

In the title compound, C11H10Br2O2, the cyclopentene ring fused to the benzene ring adopts an envelope conformation, with the C atom attached to the Br atom as the flap. The crystal structure does not exhibit any classical hydrogen bonds. The molecular packing is stabilized by van der Waals forces and π–π stacking interactions with a centroid–centroid distance of 3.811 (4) Å.

Synthesis, characterization, and SAR of arylated indenoquinoline-based cholinesterase and carbonic anhydrase inhibitors

We report the synthesis of bromoindenoquinolines (15a–f) by Friedlander reactions in low yields (13–50%) and the conversion of the corresponding phenyl‐substituted indenoquinoline derivatives 16–21 in high yields (80–96%) by Suzuki coupling reactions. To explore the structure–activity relationship (SAR), their inhibition potentials to inhibit acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and human carbonic anhydrase cyctosolic (hCA I and II) enzymes were determined. Monophenyl (16–18) indenoquinolines significantly inhibited the AChE and BChE enzymes in ranges of IC50 37–57 nM and 84–93 nM, respectively, compared with their starting materials 15a–c and reference compounds (galanthamine and tacrine). On the other hand, these novel arylated indenoquinoline‐based derivatives were effective inhibitors of the BChE, hCA I and II, BChE and AChE enzymes with Ki values in the range of 37 ± 2.04 to 88640 ± 1990 nM for AChE, 120.94 ± 37.06 to 1150.95 ± 304.48 nM for hCA I, 267.58 ± 98.05 to 1568.16 ± 438.67 nM for hCA II, and 84 ± 3.86 to 144120 ± 2910 nM for BChE. As a result, monophenyl indenoquinolines 16–18 may have promising anti‐Alzheimer drug potential and 3,8‐dibromoindenoquinoline amine (15f) can be novel hCA I and hCA II enzyme inhibitors.

A Novel Polymer Blend Based on Sodium Humate/PVP/PEG

The formation of complexes between polyvinylpyrrolidone (PVP) and sodium humate (SH) with polyethylene glycol (PEG) 300 was prepared by strong intermolecular interaction involving the formation of hydrogen bonds between the carbonyl group of PVP and hydroxyl groups and –NH2 of SH. The stability of the complex passed through an extreme value as a function of 15% SH and 10% PVP with 1% of PEG300 in an aqueous solution. The samples were further characterized by means of FTIR and SEM. The effects of polymerization variables including different reaction temperatures in various pH, content of SH, the weight ratio of PVP to PEG300 in distilled water were studied. The result from FTIR spectra showed that PVP and SH participated in graft polymerization reaction with PEG and hydrogen-bonding interaction occurred between PVP and SH. The optimum complex formation was obtained in pH 12 at 100°C. The result polymer blend was considered as a dermacosmetic drug in human and animal skin diseases, as an adhesive agent in board production, as a stabilizer agent in dye formulations, and as a film protector in wood surfaces.

2,5-Dibromo-indan-1-ol.

In the title compound, C9H8Br2O, the cyclopentene ring adopts an envelope conformation with the brominated C atom as the flap. In the crystal, molecules are linked by strong O—H⋯O hydrogen bonds into zigzag C(4) chains along [010]. In addition, a C—H⋯π interaction involving the benzene ring and the H atom attached to the hydroxylated C atom is observed.

2,3-Dihydro-1H-cyclo­penta­[b]naph­tha­len-1-ol

In the title compound, C13H12O, the cyclopentene ring fused with the naphthalene group adopts an envelope conformation. The cyclopentene torsion angle, with the fusion bond at the centre, has a magnitude of 1.16 (16)°. In the crystal, neighbouring molecules are connected through O—H⋯O hydrogen bonds into an R 4 4(8) ring motif. The crystal packing also features weak π–π stacking interactions [centroid–centroid distance = 3.8981 (8) Å] and C—H⋯π interactions.

FTIR spectroscopic and quantum-chemical studies on some tribromoindenes and their isomers

Combined experimental and computational studies on molecular structure of newly synthesised transtirans 1,2,3-tribromo-1,2,3-trihydro-1H-benz[f]indene (TTTBI) were reported. Also, only computational studies were done for cis-trans-1,2,3-tribromo-1,2,3-trihydro-1H-benz[f]indene (CTTBI) and cis-cis-1,2,3-tribromo-1,2,3-trihydro-1H-benz[f]indene (CCTBI) in order to understand the vibrational spectra and molecular parameters of them. The geometry optimization and vibrational wave numbers of the title molecules were carried out with the Gaussian98 program package by using Hartree-Fock (HF) and Density Functional Theory (DFT) with B3LYP functional and 6–31G (d) basis set. All calculations were done for the title compounds in their ground states. Especially for CTTBI and CCTBI, which could not be synthesized yet, these kind of pre-calculations take an important role for their synthesis process. Also crystal structural parameters of TTTBI by single-crystal X-ray diffraction method was used as input for computational study of it. Observed and calculated vibrational wave numbers were compared. Because the use of benz[f]indene as a cyclopentadienyl ligand attracted much attention because an annulated benzo ring might increase both the stereocontrol and productivity of catalytic system, TTTBI and other computationally studied and modeled two molecules may play an important role of other types of compounds as a starting structures.